阅读说明：本技术 一种三氧化钨纳米线电致变色薄膜的制备方法 (Preparation method of tungsten trioxide nanowire electrochromic film ) 是由 尹伊 朱皓宇 吴涛 于 2021-06-03 设计创作，主要内容包括：本发明公开一种WO-(3)纳米线电致变色薄膜的制备方法,应用于电致变色材料与器件领域,针对现有磁控溅射方法制备的薄膜结构致密平滑,与电解液有效接触面积小,使得电致变色器件性能难以进一步提高的问题；本发明以氧化铟锡(ITO)覆盖的玻璃为基片,将银靶和钨靶分别放置在直流靶位和射频靶位,利用共溅射镀膜技术,通过银诱导生长出WO-(3)纳米颗粒；利用反应溅射镀膜技术,通过钆掺杂在WO-(3)纳米颗粒上生长出纳米线结构。WO-(3)纳米线结构薄膜相比WO-(3)致密薄膜明显改善了电致变色性能。(The invention discloses a WO 3 A preparation method of a nanowire electrochromic film is applied to the field of electrochromic materials and devices, and aims at solving the problems that the film prepared by the existing magnetron sputtering method is compact and smooth in structure and small in effective contact area with electrolyte, so that the performance of an electrochromic device is difficult to further improve; the invention takes Indium Tin Oxide (ITO) covered glass as a substrate, a silver target and a tungsten target are respectively placed at a direct current target position and a radio frequency target position, and WO is generated by silver induction growth by utilizing a co-sputtering coating technology 3 A nanoparticle; doping WO with gadolinium by reactive sputtering 3 A nanowire structure is grown on the nanoparticles. WO 3 Nanowire structured thin films compare WO 3 The dense film significantly improved the electrochromic properties.)

1. WO (WO)₃The preparation method of the nanowire electrochromic film is characterized by comprising the following steps:

s1, cleaning the substrate used for preparing the film;

s2, using silver target and tungsten target as target material, setting corresponding sputtering technological parameter by using magnetron co-sputtering technology, and inducing and growing WO on substrate by using silver₃A nanoparticle;

s3, setting the corresponding sputtering technological parameters by using the reactive sputtering coating technology, in WO₃Growing Gd-doped WO on the nanoparticles₃A nanowire structure.

2. A WO according to claim 1₃The preparation method of the nanowire electrochromic film is characterized in that the substrate in the step S1 is glass covered by Indium Tin Oxide (ITO).

3. A WO according to claim 1₃The preparation method of the nanowire electrochromic film is characterized in that the cleaning treatment process of the substrate in the step S1 is as follows: and ultrasonically cleaning the glass substrate for 10 minutes by using acetone, ethanol and deionized water in sequence, and then blowing the glass substrate by using high-purity nitrogen.

4. A WO according to claim 1₃The method for preparing the nanowire electrochromic film is characterized in that WO 2₃The growth process of the nano particles is as follows:

a1, fixing the substrate on a substrate tray in a magnetron sputtering vacuum chamber, respectively placing a silver target and a tungsten target on a direct current sputtering target position and a radio frequency sputtering target position in the magnetron sputtering vacuum chamber, adjusting the rotation speed of the substrate to be 20-40 r/min, heating the substrate to be 50-200 ℃,vacuumizing the vacuum chamber until the vacuum degree is less than 3.0 multiplied by 10^-3Pa；

A2, respectively introducing oxygen and argon at the rates of 50-70 sccm and 30-50 sccm, controlling the working pressure of the vacuum chamber to be 1.0-7.0 Pa after introducing the oxygen and the argon, respectively adjusting the direct-current sputtering power and the radio-frequency sputtering power to be 3-7W and 150-250W, and sputtering for 10-30 min;

a3, after sputtering, forming WO with the diameter of 100-180 nm and the height of 100-300 nm on the substrate₃A nanoparticle film.

5. A WO according to claim 4₃The preparation method of the nanowire electrochromic film is characterized in that the purity of the silver target in the step A1 is 99.99%, the diameter is 40-60 mm, and the thickness is 1-2 mm; the purity of the tungsten target is 99.99%, the diameter is 40-60 mm, and the thickness is 1.5-2.5 mm.

6. A WO according to claim 1₃The method for preparing the nanowire electrochromic film is characterized in that WO3₃The growth process of the nanowire is as follows:

a1, WO to grow₃Fixing a substrate of a nano-particle film on a substrate tray in a magnetron sputtering vacuum chamber, placing a tungsten target on a radio-frequency sputtering target position in the vacuum chamber of magnetron sputtering equipment, clamping a tungsten filament with a concave middle part by using a metal shell for fixing the target material in the middle of the tungsten target, placing a gadolinium sheet in the concave part, adjusting the autorotation speed of the substrate to be 20-40 r/min, vacuumizing the vacuum chamber until the vacuum degree is less than 3.0 multiplied by 10 without heating the substrate, and performing vacuum treatment on the substrate^-3Pa；

A2, respectively introducing oxygen and argon at the rates of 50-70 sccm and 30-50 sccm, and after introducing the oxygen and the argon, controlling the working pressure of the vacuum chamber to be 1.0-7.0 Pa, the radio-frequency sputtering power to be 150-250W, and the sputtering time to be 90-110 min;

a3, after completion of sputtering, in WO₃WO with the diameter of 80-140 nm and the height of 1-2 mu m is formed on the nano particles₃A thin film of nanowires.

7. Root of herbaceous plantA WO according to claim 6₃The preparation method of the nanowire electrochromic film is characterized in that the purity of the tungsten target in the step A1 is 99.99%, the diameter is 40-60 mm, and the thickness is 1.5-2.5 mm; the purity of the tungsten filament is 99.99%, the diameter of the tungsten filament is 0.8-1.5 mm, and the length of the tungsten filament is 60-80 mm; the gadolinium sheet has a purity of 99.99%, a thickness of 0.2-0.6 mm and an area of 0.2-0.6 cm²。

Technical Field

The invention belongs to WO₃The technical field of electrochromic film preparation, in particular to a WO₃A preparation method of a nanowire electrochromic film.

Background

Electrochromism refers to a phenomenon in which optical properties (reflectivity, transmittance, absorption, and the like) of a material undergo a stable and reversible color change under the action of a certain electric field or current.

WO₃Has excellent coloring ability as an Electrochromic (EC) material which has been widely studied,Optical modulation capability and durability. The electrochromic mechanism is that cations and electrons are injected into WO doubly under the action of an electric field in the process of color changing₃Generation of W-containing voids in the lattice⁵⁺M of (A)_xWO₃(tungsten bronze) structure, the film turns from transparent to blue.

The magnetron sputtering method is the commonly used WO due to the advantages of simple process, suitability for large-area production and the like₃The film prepared by the method has compact and smooth structure, has the advantages of strong adhesive force with a substrate and good circulation stability, but has small contact area with electrolyte, cations cannot be effectively injected and extracted, and the electrochromic performance cannot be further improved, such as response time, specific capacitance, ion diffusion coefficient and the like. Therefore, on the basis of not changing the film preparation technology, a suitable method is found for preparing WO with larger specific surface area₃The nano-microstructure film is very significant.

Disclosure of Invention

In order to solve the technical problem, the invention provides a WO capable of effectively improving electrochromic performance₃A preparation method of a nanowire electrochromic film.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: WO (WO)₃The preparation method of the nanowire electrochromic film comprises the following steps:

s1, cleaning the substrate used for preparing the film;

s2, using a silver target and a tungsten target as targets, setting corresponding sputtering process parameters by utilizing a magnetron co-sputtering technology, and growing silver-induced WO on a substrate₃A nanoparticle;

s3, setting the corresponding sputtering technological parameters by using the reactive sputtering coating technology, in WO₃Growing Gd-doped WO on the nanoparticles₃A nanowire structure.

In step S1, the substrate is glass covered with Indium Tin Oxide (ITO).

In step S1, the cleaning process includes: and ultrasonically cleaning the glass substrate for 10 minutes by using acetone, ethanol and deionized water in sequence, and then blowing the glass substrate by using high-purity nitrogen.

WO in said step S2₃The growth process of the nano particles is as follows:

a1, fixing the substrate on a substrate tray in a magnetron sputtering vacuum chamber, respectively placing a silver target and a tungsten target on a direct current sputtering target position and a radio frequency sputtering target position in the vacuum chamber of a magnetron sputtering device, adjusting the rotation speed of the substrate to be 20-40 r/min, heating the substrate to 50-200 ℃, and vacuumizing the vacuum chamber until the vacuum degree is less than 3.0 multiplied by 10^-3 Pa；

A2, respectively introducing oxygen and argon at the rates of 50-70 sccm and 30-50 sccm, controlling the working pressure of the vacuum chamber to be 1.0-7.0 Pa after introducing the oxygen and the argon, respectively adjusting the direct-current sputtering power and the radio-frequency sputtering power to be 3-7W and 150-250W, and sputtering for 10-30 min;

a3, after sputtering, forming WO with the diameter of 100-180 nm and the height of 100-300 nm on the substrate₃A nanoparticle film.

WO in said step S3₃The growth process of the nanowire is as follows:

a1, WO to grow₃Fixing a substrate of a nano-particle film on a substrate tray in a magnetron sputtering vacuum chamber, placing a tungsten target on a radio-frequency sputtering target position in the vacuum chamber of magnetron sputtering equipment, clamping a tungsten filament with a concave middle part by using a metal shell for fixing the target material in the middle of the tungsten target, placing a gadolinium sheet in the concave part, adjusting the autorotation speed of the substrate to be 20-40 r/min, vacuumizing the vacuum chamber until the vacuum degree is less than 3 multiplied by 10 without heating the substrate, and performing vacuum treatment on the substrate^-3Pa；

A2, respectively introducing oxygen and argon at the rates of 50-70 sccm and 30-50 sccm, and after introducing the oxygen and the argon, controlling the working pressure of the vacuum chamber to be 1.0-7.0 Pa, the radio-frequency sputtering power to be 150-250W, and the sputtering time to be 90-110 min;

a3, after completion of sputtering, in WO₃WO with the diameter of 80-140 nm and the height of 1-2 mu m is formed on the nano particles₃A thin film of nanowires.

The invention has the beneficial effects that: based on the magnetron sputtering technology, the silver-tungsten co-sputtering is used for growing WO₃Nano particles, and reacting sputtering to obtain gadoliniumDoping of WO₃Nanowire electrochromic films. The preparation method provided by the invention can effectively improve WO₃The surface microstructure of the film greatly improves WO₃The contact area of the film and the electrolyte is obviously improved₃Electrochromic properties of the film.

Drawings

FIG. 1 is a WO of the present invention₃The structural schematic diagram of the nanowire electrochromic film;

FIG. 2 is a diagram of a real object in a vacuum chamber of a magnetron sputtering apparatus employed in the present invention;

FIGS. 3(a) (b) are the WO prepared in example 1, respectively₃Surface and cross-sectional Scanning Electron Microscope (SEM) images of the nanoparticle thin film;

FIGS. 4(a) (b) are the WO prepared in example 1, respectively₃Surface and cross-sectional Scanning Electron Microscope (SEM) images of the nanowire thin film;

FIG. 5 is WO prepared in example 1₃Nanowire film and pure WO coated for 120min by magnetron sputtering₃The visible light transmittance curves of the film in the colored state and the faded state are compared;

FIG. 6 is WO prepared in example 1₃Nanowire film and pure WO coated for 120min by magnetron sputtering₃Cyclic Voltammetry (CV) vs. film;

Detailed Description

The present disclosure will be further explained with reference to the drawings and specific examples in order to facilitate the understanding of the technical disclosure by those skilled in the art.

As shown in FIG. 1, is a WO prepared by the present invention₃The following describes the preparation method provided by the present invention in detail by specific examples to further demonstrate the advantages of the present invention.

Example 1

WO of the present example₃The preparation method of the nanowire electrochromic film comprises the following steps:

s1, using Indium Tin Oxide (ITO) covered glass as a substrate, using acetone, ethanol and deionized water to perform ultrasonic cleaning for 10 minutes in sequence, and then using high-purity nitrogen to blow dry.

S2, fixing the substrate on a substrate tray in a magnetron sputtering vacuum chamber, as shown in figure 2 marked 1, respectively placing a silver target and a tungsten target on a direct current sputtering target position and a radio frequency sputtering target position in the vacuum chamber of the magnetron sputtering device, as shown in figures 2 marked 2 and 3; adjusting the autorotation speed of the substrate to 30r/min, heating the substrate to 80 ℃, and vacuumizing the vacuum chamber until the vacuum degree is less than 3.0 multiplied by 10^-3Pa; respectively introducing oxygen and argon at the rates of 60sccm and 40sccm, controlling the working pressure of the vacuum chamber to be 4.9Pa after introducing the oxygen and the argon, respectively adjusting the direct-current sputtering power and the radio-frequency sputtering power to be 5W and 200W, and sputtering for 20 min; after completion of the sputtering, WO having an average diameter of about 140nm and an average height of about 170nm was formed on the substrate₃A nanoparticle film.

S3, WO will grow₃Fixing a substrate of a nano-particle film on a substrate tray in a magnetron sputtering vacuum chamber, placing a tungsten target on a radio-frequency sputtering target position in the vacuum chamber of a magnetron sputtering device, clamping a tungsten filament with a concave middle part by using a metal shell for fixing the target material in the middle of the tungsten target, placing a gadolinium sheet in the concave part, adjusting the autorotation speed of the substrate to be 30r/min, vacuumizing the vacuum chamber until the vacuum degree is less than 3.0 multiplied by 10 without heating the substrate, and performing vacuum evaporation on the vacuum chamber until the vacuum degree is less than 3.0 multiplied by 10^-3Pa; respectively introducing oxygen and argon at the rates of 60sccm and 40sccm, and controlling the working pressure of the vacuum chamber to be 4.9Pa, the radio-frequency sputtering power to be 200W and the sputtering time to be 100min after introducing the oxygen and the argon; after completion of sputtering, in WO₃WO having an average diameter of about 100nm and an average height of about 1.3 μm is formed on the nanoparticles₃A thin film of nanowires.

FIGS. 3(a) (b) are each a WO prepared in this example₃Surface and cross-sectional Scanning Electron Microscope (SEM) images of the nanoparticle thin film. This figure illustrates the success of this example in growing uniformly sized WO on an ITO glass substrate₃And (3) nanoparticles.

FIGS. 4(a) (b) are each WO prepared in this example₃Surface and cross-sectional Scanning Electron Microscope (SEM) images of the nanowire thin films. This figure illustrates the success of this example in WO₃Vertical WO grown on nanoparticles₃A nanowire.

FIG. 5 is WO prepared in example 1₃The visible light transmittance curves of the nanowire film and a pure WO3 film coated for 120min by magnetron sputtering in a coloring state and a fading state are compared. This figure illustrates the WO prepared in this example₃Nanowire thin film phase comparison pure WO₃The film has improved light modulation in the visible range.

FIG. 6 is WO prepared in example 1₃Comparison graph of cyclic voltammetry characteristic Curve (CV) of the nanowire film and a pure WO3 film coated for 120min by magnetron sputtering. This figure illustrates the WO prepared in this example₃Nanowire thin film phase comparison pure WO₃The charge and ions injected into the film are increased significantly.

Example 2

WO of the present example₃The preparation method of the nanowire electrochromic film and the application of the nanowire electrochromic film in an electrochromic device comprise the following steps:

s1, using two pieces of Indium Tin Oxide (ITO) covered glass as a first substrate and a second substrate respectively, using acetone, ethanol and deionized water to perform ultrasonic cleaning for 10 minutes in sequence, and then using high-purity nitrogen to blow dry.

S2, fixing the first substrate on a substrate tray in a magnetron sputtering vacuum chamber, as shown in figure 2 marked 1, respectively placing a silver target and a tungsten target on a direct current sputtering target position and a radio frequency sputtering target position in the vacuum chamber of magnetron sputtering equipment, as shown in figures 2 marked 2 and 3; adjusting the autorotation speed of the substrate to 30r/min, heating the substrate to 80 ℃, and vacuumizing the vacuum chamber until the vacuum degree is less than 3.0 multiplied by 10^-3Pa; respectively introducing oxygen and argon at the rates of 60sccm and 40sccm, controlling the working pressure of the vacuum chamber to be 4.9Pa after introducing the oxygen and the argon, respectively adjusting the direct-current sputtering power and the radio-frequency sputtering power to be 5W and 200W, and sputtering for 20 min; after completion of the sputtering, the sample was taken out from the vacuum chamber to form WO having an average diameter of about 140nm and an average height of about 170nm on the substrate₃A nanoparticle film.

S3, WO will grow₃The substrate of the nano-particle film is fixed on a substrate tray in a magnetron sputtering vacuum chamber, a tungsten target is placed on a radio-frequency sputtering target position in the vacuum chamber of magnetron sputtering equipment,clamping a tungsten filament with a concave middle part by using a metal shell for fixing a target material in the middle of a tungsten target, placing a gadolinium sheet in the concave part, adjusting the autorotation speed of a substrate to be 30r/min, vacuumizing a vacuum chamber until the vacuum degree is less than 3.0 multiplied by 10 without heating the substrate^-3Pa; respectively introducing oxygen and argon at the rates of 60sccm and 40sccm, and controlling the working pressure of the vacuum chamber to be 4.9Pa, the radio-frequency sputtering power to be 200W and the sputtering time to be 120min after introducing the oxygen and the argon; after sputtering is complete, the sample is removed from the vacuum chamber, in WO₃WO having an average diameter of about 100nm and an average height of about 1.7 μm is formed on the nanoparticles₃A thin film of nanowires.

S4, bonding the first substrate and the second substrate by using a heat-sealing material, namely a sarin film and an insulating gasket to form a box for containing electrolyte, wherein two electrolyte injection holes are required to be preset on the sarin film in the bonding process; prepared LiClO with the concentration of 1mol/L₄-injecting an electrolyte solution of PC through an electrolyte injection hole with a syringe; and then coating Polydimethylsiloxane (PDMS) as an insulating material on the electrolyte injection hole to insulate the electrolyte solution, sealing the electrolyte injection hole coated with the PDMS with ultraviolet glue, and irradiating under an ultraviolet lamp for 15 minutes to cure the ultraviolet glue to form the electrochromic device with excellent sealing.

The width of the sarin film and the insulating spacer used for packaging is 0.2cm, the width of the electrolyte injection hole is 0.1cm, and the two substrates are ITO surfaces facing the electrolyte layer. The sealed electrolyte containing box needs to be heated on a constant temperature heating table at a constant temperature of 100 ℃ for 20 minutes, 2500 Pa pressure is applied to the upper part of the box in the heating process to ensure tight adhesion, and the space height of the electrolyte box obtained after the treatment is 0.2 mu m.

Through inspection, the preparation method can greatly improve WO₃The specific surface area of the film is increased to improve WO₃Electrochromic properties of the film.

It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.