阅读说明：本技术 一种基于锌的氧族元素化合物纳米棒的悬浮颗粒装置 (Suspended particle device of zinc-based chalcogen compound nanorod ) 是由 王志浩 曾西平 国星 于 2021-09-15 设计创作，主要内容包括：本发明涉及纳米材料技术领域,具体涉及一种基于锌的氧族元素化合物纳米棒的悬浮颗粒装置,包括：透明导电基底的第一层；含有悬浮在悬浮介质中的锌的氧族元素化合物纳米棒的调光层；以及透明导电基底的第二层。采用本发明所述的基于锌的氧族元素化合物纳米棒,其内部较强的偶极矩使其自身适用于悬浮颗粒装置,且相对于传统的碘硫酸奎宁颗粒,其物理/化学稳定性更好。所述锌的氧族元素化合物纳米棒制备方法简单、成本低廉且对环境友好,本发明采用这种内部偶极矩较强、稳定性好且制作成本低的无机功能材料作为悬浮粒子制作悬浮颗粒装置,将所述悬浮颗粒装置施加电压后,其对可见光和红外光的透过率变化可达到28％左右,具有较好的市场前景。(The invention relates to the technical field of nano materials, in particular to a suspended particle device of a zinc-based chalcogen compound nanorod, which comprises the following components: a first layer of a transparent conductive substrate; a light-modulating layer comprising nanorods of chalcogen compound of zinc suspended in a suspension medium; and a second layer of a transparent conductive substrate. By adopting the zinc-based oxygen group element compound nanorod, the nanorod is suitable for a suspended particle device due to the strong dipole moment in the nanorod, and has better physical/chemical stability compared with the traditional quinine iodosulfate particle. The preparation method of the zinc chalcogen compound nanorod is simple, low in cost and environment-friendly, the inorganic functional material with strong internal dipole moment, good stability and low manufacturing cost is used as the suspended particle device for manufacturing the suspended particle device, after voltage is applied to the suspended particle device, the transmittance of the suspended particle device for visible light and infrared light can be changed by about 28%, and the zinc chalcogen compound nanorod has good market prospect.)

1. A suspended particle device of zinc-based chalcogen compound nanorods, comprising: a first layer of a transparent conductive substrate; a light-modulating layer comprising nanorods of chalcogen compound of zinc suspended in a suspension medium; and a second layer of a transparent conductive substrate.

2. The suspended particle device of zinc-based chalcogen compound nanorods according to claim 1, characterized in that: the length of the zinc chalcogen compound nanorod is 0.1-3 mu m, and the diameter of the nanorod is 5-500 nm.

3. The suspended particle device of zinc-based chalcogen compound nanorods according to claim 1 or 2, characterized in that: the length of the zinc chalcogen compound nanorod is 0.2-1 mu m, and the diameter of the nanorod is 50-200 nm.

4. The suspended particle device of zinc-based chalcogen compound nanorods according to claim 1, characterized in that: the zinc chalcogen compound nanorod is obtained by preparing a zinc chalcogen compound, wherein the zinc chalcogen compound comprises one or more of ZnO, ZnS, ZnSe and ZnTe.

5. The suspended particle device of zinc-based chalcogen compound nanorods according to claim 4, characterized in that: the chalcogen compound of zinc includes at least one of ZnO and ZnS.

6. The suspended particle device of zinc-based chalcogen compound nanorods according to claim 1, characterized in that: the mass fraction of the zinc chalcogen compound nanorods in the suspension medium is 0.1-50%.

7. The suspended particle device of zinc-based chalcogen compound nanorods according to claim 6, characterized in that: the suspension medium is organic insulating liquid, and the organic insulating liquid comprises one or more of organic silicone oil, vegetable oil, petroleum ether, lauryl methacrylate, dibutyl phthalate and trimethyl trimellitate.

8. The suspended particle device of zinc-based chalcogen compound nanorods according to any one of claims 1-7, characterized in that: the suspension medium is sandwiched between the first layer of the transparent conductive substrate as a transparent electrode and the second layer of the transparent conductive substrate, and a gap between the first layer of the transparent conductive substrate and the second layer of the transparent conductive substrate is 5-500 um.

9. The suspended particle device of zinc-based chalcogen compound nanorods according to claim 8, characterized in that: the transparent conductive substrate comprises one or more of ITO conductive glass, an ITO conductive film, a nano Ag wire conductive film, a nano Cu wire conductive film, a PEDOT conductive film, a PET conductive film, a graphene conductive film and a carbon nano tube conductive film.

10. The suspended particle device of zinc-based chalcogen compound nanorods according to any one of claims 1-9, characterized in that: the periphery of the first layer of the transparent conductive substrate and the periphery of the second layer of the transparent conductive substrate are packaged by insulating materials, and the insulating materials are thermosetting materials or light curing materials.

Technical Field

The invention relates to the technical field of nano materials, in particular to a suspended particle device of a zinc-based chalcogen compound nanorod.

Background

A light valve refers to a device capable of controlling light transmittance by adjusting a voltage applied thereto, which is also called an electrochromic device, and is classified into a Polymer Dispersed Liquid Crystal (PDLC), an electrochemical device (EC), and a Suspended Particle Device (SPD) according to the operating principle of the electrochromic device. Both the Suspended Particle Device (SPD) and the Polymer Dispersed Liquid Crystal (PDLC) are devices that can achieve a change in light transmittance under the action of an external electric field, and are collectively referred to as a Light Valve (LV).

As early as the forty years of the last century, scholars have conducted systematic and intensive research on light valves. Light valves are generally constructed with two transparent electrodes and a dimming layer sandwiched between the electrodes. In the case of SPD, before and after the application of an electric field, one-dimensional particles suspended in its light modulation layer are converted from random brownian motion into a state of being aligned along electric field lines, and through this process, the transmittance of light is changed; for PDLC, the liquid crystal particles in the light modulation layer change orientation in an electric field, so that the matching between the self refractive index and the refractive index of the polymer matrix is improved, and light can penetrate through the matrix to be in a transparent or semitransparent state. Because of the advantages of rich color, high transparency controllability and the like of the SPD, the PDLC has wider application range and prospect.

However, the most widely used suspended particles in the prior art are quinine iodosulfate (Herapathite) nanorods, which have the chemical formula of 4QH₂ ²⁺·3SO₄ ^2-·2I^3-·6H₂O·CH₃COOH, wherein Q is quinine (C)₂₀H₂₄N₂O₂). From the chemical composition, quinine iodosulfate is unstable in various organic and inorganic solvents, and has poor thermal stability due to the existence of iodine element. This not only results in suspended media in the SPDThe fabrication is difficult and the environmental tolerance of the SPD is greatly constrained. Although scholars have attempted to improve the stability of suspended particles by substituting iodine elements with other halogens, the presence of organic components in the product has left this approach to solve the problem essentially.

Disclosure of Invention

In order to solve the technical problems, the invention provides a suspended particle device based on zinc chalcogen compound nanorods, which solves the technical problem that the suspended particle device containing suspended particles is poor in weather resistance due to poor stability of the suspended particles in the prior art.

The invention provides a suspended particle device of zinc-based chalcogen compound nanorods, which comprises: a first layer of a transparent conductive substrate; a light-modulating layer comprising nanorods of chalcogen compound of zinc suspended in a suspension medium; and a second layer of a transparent conductive substrate.

In certain embodiments of the present invention, the chalcogen compound nanorods of zinc have a length of 0.1-3 μm and a diameter of 5-500 nm.

Preferably, the chalcogen compound nanorods of zinc have a length of 0.2-1 μm and a diameter of 50-200 nm.

In certain embodiments of the invention, the zinc chalcogen compound nanorods are obtained by preparing a zinc chalcogen compound comprising one or more of ZnO, ZnS, ZnSe, ZnTe.

Preferably, the chalcogen compound of zinc includes at least one of ZnO and ZnS.

In certain embodiments of the present invention, the chalcogen compound nanorods of zinc have a mass fraction in the suspension medium of 0.1% to 50%.

In certain embodiments of the invention, the suspension medium is an organic insulating liquid comprising one or more of silicone oil, vegetable oil, petroleum ether, lauryl methacrylate, dibutyl phthalate, trimethyl trimellitate.

In some embodiments of the present invention, the suspension medium is sandwiched between a first layer of the transparent conductive substrate as a transparent electrode and a second layer of the transparent conductive substrate, and a gap between the first layer of the transparent conductive substrate and the second layer of the transparent conductive substrate is 5 to 500 um.

In some embodiments of the present invention, the transparent conductive substrate comprises one or more of an ITO conductive glass, an ITO conductive film, a nano Ag wire conductive film, a nano Cu wire conductive film, a PEDOT conductive film, a PET conductive film, a graphene conductive film, a carbon nanotube conductive film.

In some embodiments of the present invention, the first layer of the transparent conductive substrate and the second layer of the transparent conductive substrate are encapsulated with an insulating material, and the insulating material is a thermosetting material or a photo-curing material.

Compared with the prior art, the invention has the following advantages:

the zinc-based chalcogen compound nanorod has a strong dipole moment inside, and compared with the traditional quinine iodosulfate particles, the invention adopts the inorganic functional material (zinc oxygen group element compound) with good stability, strong internal dipole moment and low manufacturing cost as the suspended particle device, after the suspended particle device is applied with voltage, the transmittance change of the nano-particles to visible light and infrared light can reach about 28 percent, the transmittance of incident light can be efficiently controlled, a new feasible research direction is provided for the prior art, and a new idea that inorganic functional materials such as the zinc chalcogen compound nano-rods are used as suspended particles to be applied to suspended particle devices is developed.

Drawings

FIG. 1 is a schematic structural view of a suspended particle device of the zinc-based chalcogen compound nanorods of the invention;

FIG. 2 is an enlarged view of ZnO nanorods in an embodiment of the present invention;

FIG. 3 is an enlarged view of ZnS nanorods in an embodiment of the present invention;

FIG. 4 is a graph showing the transmittance of a suspended particle device based on ZnO nanorods to light with wavelength of 200-800nm after a voltage of 150V is applied;

FIG. 5 is a graph showing the transmittance of a suspended particle device based on ZnS nanorods for 200-800nm wavelength light after applying 150V voltage.

In the figure: 100. a suspended particle device; 101. a transparent conductive substrate; 102. a suspension medium; 103. a zinc chalcogen compound nanorod.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 schematically presents a suspended particle device 100 according to the invention, wherein a suspension medium 102 is sandwiched between two transparent conductive substrates 101, and nanorods 103 of chalcogen compound of zinc are suspended in said suspension medium 102. In the absence of an applied electric field (off-state), the chalcogen compound nanorods 103 of zinc in the suspension medium 102 are in random positions due to brownian motion, and the light beam entering the suspended particle device 100 is absorbed/scattered. When an electric field is applied thereto (on-state), the one-dimensional particles (chalcogen compound nanorods 103 of zinc) in the dimming layer are transformed from random brownian motion into a state of being aligned along electric field lines, thereby being aligned in parallel directions to each other according to the electric field, so that a light beam can pass through the suspended particle device 100.

More specifically, the chalcogen compound nanorod 103 of zinc has a length of 0.1-3 μm and a diameter of 5-500 nm. Preferably, the chalcogen compound nanorods of zinc have a length of 0.2-1 μm and a diameter of 50-200 nm.

Also, the chalcogen compound of zinc nanorod 103 is obtained by preparing a chalcogen compound of zinc including one or more of ZnO, ZnS, ZnSe, ZnTe. Preferably, the chalcogen compound of zinc includes at least one of ZnO and ZnS.

It is noted that the selection of the zinc source may include, but is not limited to, at least one of hydrated and/or non-hydrated salts of zinc acetate, zinc nitrate, zinc sulfate, zinc chloride, and zinc chlorate.

In addition, the mass fraction of the zinc chalcogen compound nanorods 103 in the suspension medium 102 is 0.1% -50%.

According to the present invention, as shown in fig. 1, the suspension medium 102 is sandwiched between the first layer of the transparent conductive substrate 101 as a transparent electrode and the second layer of the transparent conductive substrate 101, and a gap between the first layer of the transparent conductive substrate 101 and the second layer of the transparent conductive substrate 101 is 5 to 500 um.

Preferably, the suspension medium 102 is an organic insulating liquid. More preferably, the organic insulating liquid comprises one or more of silicone oil, vegetable oil, petroleum ether, lauryl methacrylate, dibutyl phthalate, trimethyl trimellitate. More preferably, the silicone oil comprises dimethicone.

Moreover, the transparent conductive substrate 101 includes one or more of an ITO conductive glass, an ITO conductive film, a nano Ag wire conductive film, a nano Cu wire conductive film, a PEDOT conductive film, a PET conductive film, a graphene conductive film, and a carbon nanotube conductive film.

In addition, the transparent conductive substrate 101 of the first layer and the transparent conductive substrate 101 of the second layer are encapsulated with an insulating material. Preferably, the insulating material is a thermosetting material or a photo-setting material. More preferably, the insulating material comprises one or more of polyurethane resin, phenolic resin, polyimide, urea resin, epoxy acrylic resin, polyurethane acrylic resin and amino acrylic resin.

The present invention will now be described in more detail with reference to the following examples.

Example 1

1) Preparation of ZnO nano-rod

0.45g of zinc acetate dihydrate (Zn (CH)₃COO)₂·2H₂O, analytically pure) is dissolved in 40mL of ethanol to obtain a first solution; adding 0.8g of sodium hydroxide into 20mL of ethanol, and fully stirring to form a transparent solution to obtain a solution II; mixing the first solution and the second solution under the stirring action to obtain a milky precursor mixed solution; transferring the precursor mixed solution into a 100mL reaction kettle, reacting for 16h in a drying box at 180 ℃, and then taking out; after the reaction kettle is cooled to room temperature, the product is cleaned in a centrifugal mode and dried to obtain the ZnO nano-rod, as shown in figure 2.

The SEM characterization result shows that the ZnO nanorod has the length of 200-400nm and the diameter of 30-80 nm.

2) Preparation of ZnO nanorod-containing suspension

Uniformly mixing 6g of lauryl methacrylate and 14g of dimethyl silicone oil in a 250ml round bottom glass flask, weighing 2g of ZnO nanorods prepared in the step 1), adding the ZnO nanorods into the mixed solvent of the lauryl methacrylate and the dimethyl silicone oil in batches, carrying out ultrasonic stirring for 1h to obtain uniform milky opaque suspension containing the ZnO nanorods, carrying out centrifugal treatment on the suspension for 5min at the rotating speed of 2000r/min, and removing ZnO particles which are not completely dispersed at the lower layer to obtain the expected suspension containing the ZnO nanorods.

3) Preparation of suspended particle device containing ZnO nano-rod

Uniformly mixing 50um spacing balls in 10% by mass into epoxy resin; two layers of transparent ITO conductive glass electrodes are oppositely arranged, epoxy resin mixed with spacing balls is smeared between the borders of the ITO glass, and a suspension liquid injection opening with a certain length (for example, 1cm) is reserved; heating and curing epoxy resin, filling the suspension containing the ZnO nanorods prepared in the step 2) between two layers of ITO conductive glass electrodes along an injection port, and finally packaging the injection port by using the epoxy resin to obtain the suspended particle device with the spacing of 50 um. When no voltage is applied (in a closed state), the transmittance of the suspended particle device at the wavelength of 400-800nm is 3% -22%. When 150V alternating current is applied (in an open state), the transmittance of the suspended particle device at light with wavelength of 400-800nm is 11-45%. As shown in fig. 4.

Example 2

1) Preparation of ZnS nano-rod

Stirring and mixing 10mL of water and 30mL of ethylenediamine to obtain a reaction solvent; 0.45g of zinc acetate dihydrate (Zn (CH)₃COO)₂·2H₂O, analytically pure), placing the mixture into the reaction solvent, and stirring the mixture to dissolve the mixture to obtain a solution I; 0.16g of thiourea (CS (NH)₂)₂Analytically pure) is dissolved in 20mL of water, and the solution is fully stirred to obtain a transparent solution to obtain a second solution; stirring and mixing the first solution and the second solution to obtain a precursor mixed solution; transferring the precursor mixed solution into a 100mL reaction kettle, reacting for 16h in a drying box at 150 ℃, and then taking out; after the reaction kettle is cooled to room temperature, the product is cleaned in a centrifugal mode, and the ZnS nano rod is obtained by drying, as shown in figure 3.

SEM characterization results show that the length of the ZnS nanorod is 0.5-2um, and the diameter of the ZnS nanorod is 30-400 nm.

2) Preparation of ZnS nanorod-containing suspensions

Uniformly mixing 6g of lauryl methacrylate and 14g of dimethyl silicone oil in a 250ml round bottom glass flask, weighing 2g of ZnS nanorods prepared in the step 1), adding the ZnS nanorods into the mixed solvent of the lauryl methacrylate and the dimethyl silicone oil in batches, carrying out ultrasonic stirring for 1h to obtain uniform milky opaque suspension containing the ZnS nanorods, carrying out centrifugal treatment on the suspension for 5min at the rotating speed of 800r/min, and removing ZnS particles which are not completely dispersed at the lower layer to obtain the expected suspension containing the ZnS nanorods.

3) Preparation of suspended particle device containing ZnS nano-rod

Uniformly mixing 50um spacing balls in the epoxy resin according to the mass fraction of 0.5%; two layers of transparent ITO conductive glass electrodes are oppositely arranged, epoxy resin mixed with spacing balls is smeared between the borders of the ITO glass, and a suspension liquid injection opening with a certain length (for example, 1cm) is reserved; heating and curing epoxy resin, filling the suspension containing the ZnS nanorods prepared in the step 2) between two layers of ITO conductive glass electrodes along an injection port, and finally packaging the injection port by using the epoxy resin to obtain the suspended particle device with the spacing of 50 um. When no voltage is applied (in a closed state), the transmittance of the suspended particle device at the wavelength of 400-800nm is 3% -14%. When 150V alternating current is applied (in an open state), the transmittance of the suspended particle device at light with wavelength of 400-800nm is 20-42%. As shown in fig. 5.

Experiments show that the zinc-based oxygen-group element compound nanorod suspension particle device has the transmittance change of about 28% for visible light and infrared light, and compared with the traditional quinine iodosulfate particles, the zinc-based oxygen-group element compound nanorod has better stability and stronger internal dipole moment, can adjust the light transmittance in a wider range, provides a new idea for selecting suspension particles in the suspension particle device, and effectively avoids the problems of instability caused by adopting organic materials and great restraint on SPD environmental tolerance by creatively selecting an inorganic functional material, namely a zinc oxygen-group element compound.

The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.