阅读说明：本技术 一种基于黑磷纳米片的多功能反应平台及其构建方法和应用 (Multifunctional reaction platform based on black phosphorus nanosheets and construction method and application thereof ) 是由 张斌 曹亚明 颜青 樊菲 陈彧 于 2019-09-06 设计创作，主要内容包括：本发明涉及一种基于黑磷纳米片的多功能反应平台及其构建方法和应用。借鉴贻贝灵感化学,利用多巴胺能在弱碱性条件下发生自聚合的特性,在各种基底表面形成聚多巴胺薄膜涂层。聚多巴胺薄膜涂层表面拥有大量的邻苯二酚,吡啶和吡咯官能团,这使得许多功能性材料能够通过迈克尔加成反应和单电子自由基聚合反应等接枝到经聚多巴胺修饰后的黑磷纳米片表面,从而达到对黑磷纳米片功能性调控的目的,拓宽了基于黑磷材料的应用范围。本发明适用于4,4,4,4-四叔丁基氧钛酞菁(tBu<Sub>4</Sub>PcTiO),氨基(多聚左旋赖氨酸),巯基(甲氧基聚乙二醇巯基),卤素(2-溴丙酰溴)等能与聚多巴胺反应的功能性材料。(The invention relates to a black phosphorus nanosheet-based multifunctional reaction platform and a construction method and application thereof. By using mussel inspiration chemistry for reference, the characteristic that the dopamine can undergo self-polymerization under the alkalescent condition is utilized to form polydopamine film coatings on the surfaces of various substrates. The surface of the polydopamine film coating is provided with a large amount of catechol, pyridine and pyrrole functional groups, so that a plurality of functional materials can be grafted to the surface of the black phosphorus nanosheet modified by the polydopamine through Michael addition reaction, single electron free radical polymerization reaction and the like, the purpose of regulating and controlling the functionality of the black phosphorus nanosheet is achieved, and the application range based on the black phosphorus material is widened. The invention is suitable for 4, 4, 4, 4-tetra-tert-Butyloxytitanylphthalocyanine (tBu) 4 PcTiO), amino (poly-L-lysine), sulfydryl (methoxy polyethylene glycol sulfydryl), halogen (2-bromopropionyl bromide) and other functional materials capable of reacting with polydopamine.)

1. A multifunctional reaction platform based on black phosphorus nanosheets is characterized in that: the structural formula is shown in the following formula PDA-cappedBP:

2. the construction method of the black phosphorus nanosheet-based multifunctional reaction platform of claim 1, wherein: the method comprises the following steps:

firstly, preparing a few-layer two-dimensional black phosphorus dispersion liquid and a solid black phosphorus film:

weighing black phosphorus crystals in a glove box filled with argon atmosphere, and grinding; covering the black phosphorus powder obtained after grinding with an NMP solvent subjected to argon bubbling, transferring the black phosphorus powder to a Schlenk bottle, and taking out a glove box; the reaction system is subjected to uninterrupted ultrasound in a water bath ultrasonic machine, and the temperature is controlled below 5 ℃ in the process; centrifuging the obtained dispersion system, and extracting upper-layer brown yellow dispersion liquid containing the stripped black phosphorus nanosheets;

dripping the dispersion liquid containing the high-concentration few-layer two-dimensional black phosphorus nanosheets onto a vacuum filter membrane, and forming a layer of black phosphorus nanosheet film on the filter membrane after the solvent is removed through decompression; the vacuum filter membrane is reversely buckled on the surface of an ITO/PET flexible substrate with certain viscosity, and pressure is applied to the combined part of the vacuum filter membrane and the ITO/PET flexible substrate through a tablet press; tearing the ITO/PET flexible substrate after tabletting is finished, and forming a layer of compact and uniform two-dimensional black phosphorus film on the surface of the PET flexible substrate by a solid phase transfer method;

secondly, the construction of the multifunctional reaction platform based on the black phosphorus nanosheet comprises the following steps:

1) preparing a Tris-HCl buffer solution;

2) ultrasonically dissolving dopamine hydrochloride solid powder into a Tris-HCl buffer solution, and ultrasonically treating until the solution is slightly yellow;

3) soaking the PET substrate loaded with the black phosphorus film in a beaker filled with Tris-HCl buffer solution; in the stirring process of adopting a shaking table, slowly dropwise adding a Tris-HCl buffer solution dissolved with dopamine into a beaker; the reaction system is stirred vigorously to react at room temperature and atmospheric environment;

4) after the surface film forming modification reaction is finished, washing the surface of the PET substrate by using a large amount of deionized water and ethanol to remove polydopamine particles which are not formed into a film and residual trihydroxymethyl aminomethane; the resulting multifunctional reaction platform was dried in a vacuum oven.

3. A construction method of the black phosphorus nanosheet-based multifunctional reaction platform as set forth in claim 2, is characterized in that: the method comprises the following steps:

the preparation of the few-layer two-dimensional black phosphorus dispersion liquid and the solid black phosphorus film comprises the following steps:

weighing 100mg of black phosphorus crystals in a glove box filled with argon, and manually grinding in an agate mortar for 30 min; covering the black phosphorus powder obtained after grinding with 100ml of NMP solvent subjected to argon bubbling for 30min, transferring the black phosphorus powder to a Schlenk bottle by using a rubber head dropper, and taking out a glove box; carrying out uninterrupted ultrasound on the reaction system in a water bath ultrasonic machine with the power of 300W for 6h, frequently replacing an ice bag in the process and controlling the water bath temperature to be below 5 ℃; centrifuging the obtained dispersion system at 2000rpm for 120min, carefully extracting an upper brown yellow dispersion liquid containing the stripped black phosphorus nanosheets, centrifuging the dispersion liquid at 8000-10000rpm for 120min, and collecting a lower black phosphorus nanosheet precipitate.

Dripping a dispersion liquid containing high-concentration few-layer two-dimensional black phosphorus nanosheets onto a vacuum filter membrane (with the aperture of 200nm), and decompressing and removing the solvent to form a layer of black phosphorus nanosheet film on the filter membrane; reversely buckling the vacuum filter membrane on the surface of the ITO/PET flexible substrate, and applying a pressure of 10MPa to the combined part of the vacuum filter membrane and the ITO/PET flexible substrate through a tablet press for 15 min; tearing the ITO/PET flexible substrate after tabletting is finished, so that a layer of compact and uniform two-dimensional black phosphorus film is formed on the surface of the PET flexible substrate;

secondly, the construction of the multifunctional reaction platform based on the black phosphorus nanosheet comprises the following steps:

1) preparation of Tris-HCl buffer solution 1.21g of Tris (hydroxymethyl) aminomethane is weighed and dissolved in 800mL of deionized water, and hydrochloric acid is dropwise added until the pH value of the solution is 8.5;

2) weighing 200mg dopamine hydrochloride solid powder, dissolving the dopamine hydrochloride solid powder in 120mL Tris-HCl buffer (10mM, pH 8.5) by ultrasonic treatment until the solution is slightly yellow;

3) cutting the PET substrate carrying the black phosphorus film into a size of 1cm multiplied by 1cm, and soaking in a beaker (the volume is 500mL) filled with 100mL of Tris-HCl buffer solution; in order to avoid scratching the black phosphorus film by the stirrer in the reaction process, the shaking table is used for replacing the violent stirring of the stirrer; while the shaker was stirring at 400rpm, the Tris-HCl buffer solution with dissolved dopamine was slowly added dropwise into the beaker (within 30 min). The reaction system is stirred vigorously at room temperature and atmospheric environment for 12 hours.

4) After the surface film forming modification reaction is finished, washing the surface of the PET substrate by using a large amount of deionized water and ethanol to remove polydopamine particles which are not formed into a film and residual trihydroxymethyl aminomethane; the obtained multifunctional reaction platform is dried in a vacuum oven for 12 hours at the temperature of 40 ℃.

4. A method for constructing a multifunctional reaction platform based on black phosphorus nanosheets, as recited in claim 2 or claim 3, wherein the method comprises the following steps: and (3) drying the film obtained in the step one in a vacuum drying oven at 60 ℃ to remove residual organic solvent.

5. A preparation method of a few-layer two-dimensional black phosphorus dispersion liquid and a solid black phosphorus film is characterized by comprising the following steps:

weighing 100mg of black phosphorus crystals in a glove box filled with argon, and manually grinding in an agate mortar for 30 min; covering the black phosphorus powder obtained after grinding with 100ml of NMP solvent subjected to argon bubbling for 30min, transferring the black phosphorus powder to a Schlenk bottle by using a rubber head dropper, and taking out a glove box; carrying out uninterrupted ultrasound on the reaction system in a water bath ultrasonic machine with the power of 300W for 6h, frequently replacing an ice bag in the process and controlling the water bath temperature to be below 5 ℃; centrifuging the obtained dispersion system at the rotating speed of 2000rpm for 120min, and carefully extracting an upper-layer brown yellow dispersion liquid containing the stripped black phosphorus nanosheets;

dripping the dispersion liquid containing the high-concentration few-layer two-dimensional black phosphorus nanosheets onto a vacuum filter membrane, and forming a layer of black phosphorus nanosheet film on the filter membrane after the solvent is removed through decompression; reversely buckling the vacuum filter membrane on the surface of an ITO/PET flexible substrate with certain viscosity, and applying pressure of 10MPa to the combined part of the vacuum filter membrane and the ITO/PET flexible substrate through a tablet press for 15 min; and tearing the ITO/PET flexible substrate after tabletting is finished, and forming a layer of compact and uniform two-dimensional black phosphorus film on the surface of the PET flexible substrate by a solid-phase transfer method.

6. The method for preparing the few-layer two-dimensional black phosphorus dispersion and the solid black phosphorus thin film according to claim 5, wherein the pore diameter of the vacuum filtration membrane is 200 nm.

7. The multifunctional reaction platform based on the black phosphorus nanosheet, according to claim 1, is characterized in that the reaction platform has a large number of catechol, pyridine and pyrrole functional groups, functional molecules can be grafted through Michael addition reaction polymerization reaction and single electron free radical polymerization reaction, and the multifunctional reaction platform can be further applied to the fields of nonvolatile resistive random access memory, memristors and the like.

8. The multifunctional reaction platform based on black phosphorus nanoplates as in claim 7, wherein the functional molecule can be 4, 4, 4, 4-tetra-tert-butoxytitanylphthalocyanine (tBu)₄PcTiO), amino (poly-L-lysine), mercapto (methoxypolyethylene glycol mercapto), halogen (2-bromopropionyl bromide).

9. A plurality of functional materials can be grafted to the surface of the black phosphorus nanosheet modified by polydopamine, so that the functionality of the black phosphorus nanosheet can be regulated and controlled.

Technical Field

The invention belongs to the technical field of construction of a multifunctional reaction platform by modifying black phosphorus nanosheets through self-polymerization film forming of dopamine. By using mussel inspiration chemistry, dopamine is utilized to undergo self-polymerization under the alkalescent condition and is tightly adhered to the surfaces of various substrates to form a polydopamine film coating. Because the surface of the polydopamine film coating is provided with a large amount of catechol, pyridine and pyrrole functional groups, a plurality of functional materials can be grafted to the surface of the black phosphorus nanosheet modified by the polydopamine through Michael addition reaction, single electron free radical polymerization reaction and the like, so that the purpose of regulating and controlling the functionality of the black phosphorus nanosheet is achieved, and the application range based on the black phosphorus material is widened.

Background

As another layered two-dimensional material in the later graphene era, the few-layer black phosphorus two-dimensional material has the characteristics of adjustable direct energy band gap along with the number of layers, excellent in-plane anisotropy, high carrier mobility, broadband nonlinear optical response and the like, so that the material has wide application in the aspects of photoelectric functional materials and the like. However, since the black phosphorus material is unstable, severe material degradation occurs within several hours under normal atmospheric conditions.

Mussel, a commonly occurring bivalve mollusk in nature, holds itself tightly to almost all types of substrate surfaces with high bonding strength (high viscosity), even if the substrate surface being modified is very moist. Based on this characteristic, scientists developed a new method for modifying the surface of a material by film-forming, Mytilus inspirence chemistry (Mussel Inspire chemistry). Mussel sensual chemistry is a simple, effective, green and mild reaction method that can be used for surface modification of different materials and substrates, regardless of the size, shape and composition of the substrate^[. Therefore, a layer of uniform polydopamine biological film can be grown on the surface of the black phosphorus film in an auto-agglutination manner through a mussel chemical method, and the surface film forming functional modification is realized on the two-dimensional black phosphorus material, so that a biological reaction platform capable of realizing multifunctional purposes is constructed. The technology firstly utilizes the self-polymerization of dopamineReducing properties of the adhered substrate in the process and oxygen consumption behavior in the reaction process^[So that the two-dimensional black phosphorus material which is easy to degrade under the action of oxygen in the reaction process is in a reaction environment with low oxygen concentration; when the self-polymerization reaction is completed, a compact poly-dopamine film formed on the surface of the black phosphorus can realize effective protection of the two-dimensional black phosphorus material, and a new strategy is provided for improving the air stability of the two-dimensional black phosphorus material, like performing one-time biological encapsulation on the black phosphorus material; secondly, the modification method is different from other modification methods, and can damage the lattice structure of the two-dimensional black phosphorus material to a certain degree, the reaction condition of the modification method is simple and mild, and the damage effect on the lattice structure of the two-dimensional black phosphorus material can not be generated; finally, the modification method can reserve the intrinsic characteristics of the black phosphorus two-dimensional material with few layers to the maximum extent, and can realize effective regulation and control on the performance of the reaction platform through various reactions which can be realized on the surface of the polydopamine, so that the modification method has a wider application prospect in the research fields of corrosion prevention, antibiosis, photothermal treatment and the like.

Disclosure of Invention

Based on the characteristics of simple and effective mussel inspiration chemistry and green color temperature, the black phosphorus nanosheet is modified by utilizing polydopamine film forming, and the two purposes are achieved.

The invention provides a multifunctional reaction platform based on black phosphorus nanosheets and a construction method thereof.

Yet another second object of the present invention is to provide a new strategy for improving the air stability of black phosphorus materials.

The third purpose of the invention is the application of the multifunctional reaction platform based on the black phosphorus nanosheet, namely, a plurality of functional materials can be grafted to the surface of the black phosphorus nanosheet modified by the polydopamine, so that the functionality of the black phosphorus nanosheet can be regulated.

The technical scheme of the invention is as follows:

a multifunctional reaction platform based on black phosphorus nanosheets, namely a multifunctional reaction platform constructed by poly-dopamine surface film-forming modification black phosphorus nanosheets, and the structural formula of the multifunctional reaction platform is shown as the following formula PDA-cappedBP:

by utilizing the self-polymerization film-forming modification of the black phosphorus nanosheet by dopamine under the condition of alkalescence (PH 8.5), functional groups such as catechol, pyridine and pyrrole are introduced, so that the further modification of various functional materials is facilitated; and a compact poly-dopamine film is formed on the surface of the black phosphorus nanosheet by self polymerization of dopamine under a weakly alkaline (pH 8.5) condition, and the air stability of the black phosphorus nanosheet is improved as the black phosphorus nanosheet is subjected to one-time biological packaging.

The invention provides a construction method of a multifunctional reaction platform based on black phosphorus nanosheets, which comprises the following steps:

firstly, preparing a few-layer two-dimensional black phosphorus dispersion liquid and a solid black phosphorus film:

weighing black phosphorus crystals in a glove box filled with argon atmosphere, and grinding; covering the black phosphorus powder obtained after grinding with an NMP solvent subjected to argon bubbling, transferring the black phosphorus powder to a Schlenk bottle, and taking out a glove box; the reaction system is subjected to uninterrupted ultrasound in a water bath ultrasonic machine, and the temperature is controlled below 5 ℃ in the process; centrifuging the obtained dispersion system, and extracting upper-layer brown yellow dispersion liquid containing the stripped black phosphorus nanosheets;

dripping the dispersion liquid containing the high-concentration few-layer two-dimensional black phosphorus nanosheets onto a vacuum filter membrane, and forming a layer of black phosphorus nanosheet film on the filter membrane after the solvent is removed through decompression; the vacuum filter membrane is reversely buckled on the surface of an ITO/PET flexible substrate with certain viscosity, and pressure is applied to the combined part of the vacuum filter membrane and the ITO/PET flexible substrate through a tablet press; tearing the ITO/PET flexible substrate after tabletting is finished, and forming a layer of compact and uniform two-dimensional black phosphorus film on the surface of the PET flexible substrate by a solid phase transfer method;

secondly, the construction of the multifunctional reaction platform based on the black phosphorus nanosheet comprises the following steps:

1) preparing a Tris-HCl buffer solution;

2) dissolving dopamine hydrochloride solid powder in Tris-HCl buffer (10mM, pH 8.5) by ultrasonic dissolution until the solution is slightly yellow;

3) soaking the PET substrate loaded with the black phosphorus film in a beaker filled with Tris-HCl buffer solution; in the stirring process of adopting a shaking table, slowly dropwise adding a Tris-HCl buffer solution dissolved with dopamine into a beaker; the reaction system is stirred vigorously to react at room temperature and atmospheric environment;

4) after the surface film forming modification reaction is finished, washing the surface of the PET substrate by using a large amount of deionized water and ethanol to remove polydopamine particles which are not formed into a film and residual trihydroxymethyl aminomethane; the resulting multifunctional reaction platform was dried in a vacuum oven.

The invention provides a construction method of a multifunctional reaction platform based on black phosphorus nanosheets, which specifically comprises the following steps:

1. the preparation of the few-layer two-dimensional black phosphorus dispersion liquid and the solid black phosphorus film comprises the following steps:

100mg of black phosphorus crystals were weighed in a glove box filled with argon atmosphere and ground manually in an agate mortar for 30 min. The black phosphorus powder obtained after grinding was covered with 100ml of an NMP solvent after bubbling with argon gas for 30min, and transferred to a Schlenk bottle with a dropper, and the glove box was taken out. The reaction system is subjected to continuous ultrasonic treatment for 6 hours in a water bath ultrasonic machine with the power of 300W, and the ice bag is frequently replaced in the process to control the water bath temperature below 5 ℃. The resulting dispersion system was centrifuged at 2000rpm for 120min and then the upper brown-yellow dispersion containing exfoliated black phosphorus nanoplates was carefully extracted. And (3) dropwise adding the dispersion liquid containing the high-concentration few-layer two-dimensional black phosphorus nanosheets onto a vacuum filter membrane (with the aperture of 200nm), and decompressing and pumping off the solvent to form a layer of black phosphorus nanosheet film on the filter membrane. And reversely buckling the vacuum filter membrane on the surface of the ITO/PET flexible substrate with certain viscosity, and applying 10MPa pressure to the combined part of the vacuum filter membrane and the ITO/PET flexible substrate through a tablet press for 15 minutes. And tearing the ITO/PET flexible substrate after tabletting is finished, and forming a layer of compact and uniform two-dimensional black phosphorus film on the surface of the PET flexible substrate by a solid-phase transfer method. The resulting film was dried in a vacuum oven at 60 ℃ to remove residual organic solvent.

2. The construction of the multifunctional reaction platform based on the black phosphorus nanosheet comprises the following steps:

1) preparation of Tris-HCl buffer solution 1.21g of Tris (hydroxymethyl) aminomethane was weighed into 800mL of deionized water, and hydrochloric acid was added dropwise until the pH of the solution became 8.5.

2) 200mg of dopamine hydrochloride solid powder was weighed, dissolved in 120mL of Tris-HCl buffer (10mM, pH 8.5) by sonication, and sonicated until the solution became slightly yellow.

3) The above PET substrate carrying the black phosphorus film was cut into a size of 1cm X1 cm, and soaked in a beaker (volume 500mL) containing 100mL of a Tris-HCl buffer. In order to avoid the scratching of the black phosphorus film by the stirrer in the reaction process, the shaking table function is adopted to replace the violent stirring of the stirrer. While the shaker was stirring at 400rpm, the Tris-HCl buffer solution with dissolved dopamine was slowly added dropwise into the beaker (within 30 min). The reaction system is stirred vigorously at room temperature and atmospheric environment for 12 hours.

4) After the surface film forming modification reaction is finished, washing the surface of the PET substrate by using a large amount of deionized water and ethanol to remove the polydopamine particles which are not formed into a film and residual trihydroxymethyl aminomethane. The obtained multifunctional reaction platform is dried in a vacuum oven for 12 hours at the temperature of 40 ℃.

The specific synthetic route is shown in FIG. 5.

The invention also provides preparation of the few-layer two-dimensional black phosphorus dispersion liquid and the solid black phosphorus film, and the preparation method is as described in the above 1.

The invention provides a multifunctional reaction platform based on black phosphorus nanosheets, which has a large number of catechol, pyridine and pyrrole functional groups and can be used for preparing a catalystFunctional molecules are grafted through Michael addition reaction polymerization reaction and single electron free radical polymerization reaction, and the method is further better applied to the fields of nonvolatile resistive random access memory, memristors and the like. The functional molecule can be 4, 4, 4, 4-tetra-tert-butoxy titanium phthalocyanine (tBu)₄PcTiO), amino (poly-L-lysine), mercapto (methoxypolyethylene glycol mercapto), halogen (2-bromopropionyl bromide).

The invention also provides the 4, 4, 4, 4-tetra-tert-butoxy titanium phthalocyanine (tBu) grafted by the multifunctional reaction platform based on the black phosphorus nanosheet₄PcTiO), amino (poly-L-lysine), sulfhydryl (methoxy polyethylene glycol sulfhydryl) and halogen (2-bromopropionyl bromide).

1. The multifunctional reaction platform constructed above is grafted with 4, 4, 4, 4-tetra-tert-butoxy titanium phthalocyanine (tBu)₄PcTiO), comprising the following steps;

50mg of 4, 4, 4, 4-tetra-tert-butoxytitanium phthalocyanine (tBu) were weighed out₄PcTiO) is dissolved in 30mL of chloroform, the PET substrate loaded with the polydopamine modified black phosphorus film is soaked in a chloroform solution, and reflux reaction is carried out for 24 hours in an argon environment. After cooling to room temperature, the surface of the PET substrate was rinsed with chloroform and methanol to remove unreacted 4, 4, 4, 4-tetra-tert-butoxytitanium phthalocyanine (tBu)₄PcTiO). The resulting device was dried in a vacuum oven at 50 ℃ for 12 h.

2. The multifunctional reaction platform constructed above is grafted with amino (poly-L-lysine) and sulfhydryl (methoxy polyethylene glycol sulfhydryl), and comprises the following steps;

the multifunctional reaction platform constructed above was placed in a three-necked reaction flask filled with argon atmosphere and submerged in 30mL of Tris-HCl buffer. 10mg of amino-terminated PEG (poly-L-lysine PEG) or 20mg of thiol-terminated PEG (methoxypolyethylene glycol thiol PEG) was dissolved in 15mL of Tris-HCl buffer (pH 8.5) by sonication, and slowly added dropwise to the reaction system in a three-necked reaction flask. The reaction was stirred at room temperature for 12 h. And washing the ITO/PET substrate sheet after the reaction is finished by using a large amount of deionized water and ethanol. Finally, the mixture is placed in a vacuum drying oven to be dried for 6 hours at the temperature of 60 ℃.

3. The multifunctional reaction platform grafted halogen (2-bromopropionyl bromide) constructed above comprises the following steps;

the multifunctional reaction platform constructed above is placed in a three-mouth reaction bottle filled with argon atmosphere, and the re-steamed triethylamine (20mL) and toluene (10mL) solvents are sequentially added. The three-mouth reaction bottle is placed in an ice-water bath. After the reaction system was cooled to 5 ℃ or lower, an anhydrous toluene solution in which 2-bromopropionyl bromide (15mg) was dissolved was slowly added dropwise to the reaction system. The reaction temperature was maintained at 0 ℃ and the reaction was stirred for 6 h. The ITO/PET substrate after the reaction is washed by a large amount of toluene solvent and then washed by acetone for three times. Finally, the mixture is placed in a vacuum drying oven to be dried for 6 hours at 50 ℃.

The invention has the beneficial technical effects that:

the invention uses the mytilus inspiritis chemistry for reference, and utilizes the characteristic that the dopamine can generate self-polymerization under the alkalescent condition to form polydopamine film coatings on the surfaces of various substrates. The surface of the polydopamine film coating is provided with a large amount of catechol, pyridine and pyrrole functional groups, so that a plurality of functional materials can be grafted to the surface of the black phosphorus nanosheet modified by the polydopamine through Michael addition reaction, single electron free radical polymerization reaction and the like, the purpose of regulating and controlling the functionality of the black phosphorus nanosheet is achieved, and the application range based on the black phosphorus material is widened. The invention is suitable for 4, 4, 4, 4-tetra-tert-butyl-oxytitanium phthalocyanine (tBu)₄PcTiO), amino (poly-L-lysine), mercapto (methoxypolyethyleneglycol mercapto), halogen: (I), (II)2-bromopropionyl bromide) and the like which can react with polydopamine.

The dopamine is self-polymerized on the surface of the black phosphorus nanosheet under the condition of alkalescence (pH 8.5) to form a compact polydopamine film, and the air stability of the black phosphorus nanosheet is improved as the black phosphorus nanosheet is subjected to one-time biological packaging.

Drawings

FIG. 1 is (a) a field emission scanning electron microscope image of a black phosphorus film on an ITO/PET substrate; (b) and (c) is the elemental distribution of the substrate surface; (d) scanning electron microscope images of the cross section of the black phosphorus film on the ITO/PET substrate; (e) and (f) is the element distribution of the cross section.

Fig. 2 is an atomic force microscope image of a black phosphorus film.

FIG. 3 is (a) and (b) high-resolution transmission electron microscope images of a polydopamine film-forming modified black phosphorus material; (c) and (d) the graph is the meta-distribution image of the graph (b).

FIG. 4 is an atomic force microscope image of a polydopamine film-forming modified two-dimensional black phosphorus material.

FIG. 5 is a schematic diagram of the construction process of the multifunctional reaction platform.

FIG. 6 is a functional molecular grafting multifunctional reaction platform

Detailed description of the preferred embodiments

The preparation method and the morphological characteristics of the multifunctional reaction platform based on the black phosphorus nanosheet are described in detail below with reference to the accompanying drawings, so that the invention is more intuitive and understandable.