Core-shell structure photonic crystal electrochromic composite film and preparation method thereof

A photonic crystal and electrochromic technology, applied in the coating and other directions, can solve the problems of short life and poor cycle stability of color-changing films, and achieve the effects of low cost, enhanced optical contrast and response rate, and improved conductivity and transparency.

Pending Publication Date: 2022-02-11
NANJING INST OF TECH
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AI-Extracted Technical Summary

Problems solved by technology

However, the current core-shell inverse opal electrochromic film stil...
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Method used

[0040] As shown in Figure 1, by cyclic voltammetry with a rate of 50mV s-1 scanning 250 cycles can be used to evaluate the cycle stability of WO3/PEDOT inverse opal. After electropolymerizing PEDOT on the skeleton of WO3 inverse opal to form WO3/PEDOT core-shell inverse opal, its cycle stability has been greatly enhanced, because the ordered porous array of inverse opal has a large specific surface area, The contact active site...
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Abstract

The invention discloses a core-shell structure photonic crystal electrochromic composite film, wherein the electrochromic composite film is formed by electrically polymerizing WO3 inverse opal with a conductive polymer PEDOT, the WO3 inverse opal is a core skeleton, and the conductive polymer PEDOT is a shell layer. The WO3 inverse opal structure is a porous hexagonal array, the aperture of the WO3 inverse opal is 700-800 nm, after the PEDOT is electrically polymerized, the inner diameter of the inverse opal is 500-600 nm, and the thickness of the PEDOT layer is 100-300 nm. The invention further discloses a preparation method of the core-shell structure photonic crystal electrochromic composite film. According to the core-shell structure photonic crystal electrochromic composite film and the preparation method thereof, the preparation method is simple and easy to implement and low in preparation cost, and the prepared electrochromic composite film is stable in structure, excellent in performance and long in cycle life.

Application Domain

Coatings

Technology Topic

PhysicsThin membrane +8

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  • Core-shell structure photonic crystal electrochromic composite film and preparation method thereof
  • Core-shell structure photonic crystal electrochromic composite film and preparation method thereof
  • Core-shell structure photonic crystal electrochromic composite film and preparation method thereof

Examples

  • Experimental program(7)

Example Embodiment

[0032] Example 1
[0033] Step 1, a parent-treated FTO glass is used as a substrate, and the concentration of 0.1% by weight of the concentration of 0.1% by weight is inserted into a PS microspheres, and the oil is filled with water to obtain a regular PS colloidal crystal template.
[0034] Step 2, 1.06 g of sodium dihydrate, 0.6 ml of hydrogenated, 16.6 ml of hydrolic acid and 0.22 g of structural guides and 240 ml of deionized water, prepared to WO 3 Forward fluid, ultrasonic stirring was 18 min to give the desired electrolyte.
[0035] Step three, the step 1, the PS colloidal crystal template is used as the working electrode, silver / silver chloride as the reference electrode, and the platinum sheet is deposited in the void of the PS microsphere under the three-electrode system of the electrode. WO 3 Electrodeposition 300s. After the end of the fill, flush 4 times with ethanol and deionized water, N 2 Get wo after drying in the atmosphere 3 / PS photonic crystal film.
[0036] Step four, will step three wo 3/ PS photonic crystal film is placed in tetrahydrofuran so soaked in tetrahydrofuran, and then the speed of 1 ° C / min is raised to 480 ° C in the tube furnace under the air atmosphere. 3 Anti-protein stone.
[0037] Step 5. Configure 1 Gedot, 6.5 g of sodium sulfate and 0.013 g of surfactants with 180 mL of deionized water mixed solution, ultrasonic stirring for 20 min to give the desired electrolyte.
[0038] Step six, take the step four WO 3 The anti-protein stone is the working electrode, under the three electrode system, at 1.2V constant potential in WO 3 Above the backbone of the skeleton of the anti-protein, PEDOT 5S, get wo 3 / PEDOT Nuclear Shell Photonic Crystal Electrochromic Thin Film.
[0039] WO to the above 3 / PEDOT Nuclear Shell Photonic Crystal Electrochromic Film for Structural Characterization, Component Analysis, and Performance Test, the resulting results are as follows:
[0040] like figure 1 As shown, by circulating voltammetry 50 mV s -1 Rate Scan 250 cycles can be used to assess WO 3 / PEDOT anti-protein stone cycle stability. Poly PEDOT electrical polymerization in WO 3 Above the skeleton of the anti-protein stone forms WO 3 After the PEDOT Nuclear Shell, the cycle stability has been greatly enhanced, because the ordered multi-porous array of antimony has a large specific surface area, increasing the contact active site of the electrolyte, expanded Charge transmission range, while WO 3 Compounds with PEDOT form a dual cathode electrochromic system, because WO 3 It has a strong oxidation / reduction tolerance, which can be used as a carrier of excess external voltages, effectively preventing excessive oxidation / restoration of PEDOT, thereby enhancing the circulating stability of the material.
[0041] like figure 2 Disted, by 1M Liclo 4 Different voltages (+ 1V, -1V) were applied in the PC electrolyte, and the transmission spectrum of 300 nm to 1100 nm was measured, and under the external electric field, WO 3 / PEDOT anti-protein stone reversible between transparent white (+ 1V) and dark blue (-1V), the optical contrast at 580 nm wavelengths is 34.1%, and the optical contrast at 1100 nm is 26.2%.
[0042] like image 3 As shown, it is known from the SEM map that the electrodeposition is made. 3 Anti-protein stone and wo 3 / PEDOT anti-opal is a porous hexagonal array, the overall regular or order, there is no surface defect, and has a characteristic of large area-free cracks. WO 3 The aperture diameter of the anti-opide is about 680 nm. After electropolymerization PEDOT, the inner diameter of the antimony stone is further reduced to 510 nm, and the thickness of the PEDOT layer is about 85 nm.
[0043] like Figure 4 As shown, according to the RAMAN spectrum, WO 3 Anti-protein stone in 132cm -1 272CM -1 Raman Peak at the point corresponds to the six-party WO 3 709cm -1 804cm -1 Raman Peak at the department corresponds to the six-party WO 3 This is consistent with the previous SEM observations. PEDOT in 441cm -1 , 571cm -1 988cm -1 Three Raman Peak is caused by deformation of the oxide ring, in 1269cm -1 Spectral belt attributed to C α -C α′ Room stretch vibration. Located in 1367cm -1 , 1435cm -1 , 1497cm -1 1562cm -1 Raman Peaks at the thiophene ring respectively β -C β' Stretching, C α -C β (-O) stretching and asymmetric C α -C β Stretching. WO 3 / PEDOT anti-opal's Raman peak observed WO 3 Anti-protein stone and PEDOT's characteristic vibration peak, indicating that PEDOT has successfully polymerized to WO 3 Macher skeleton surface of anti-opal.

Example Embodiment

[0044] Example 2
[0045] Step 1, a parent-treated FTO glass is used as a substrate, and the concentration of 0.14 wt% of the concentration of 0.14 wt% is perpendicular to the PS microspheres, and the oil is arranged in a 53 ° C oven to obtain a PS colloidal crystal crystal template arranged in the rule.
[0046] Step 2, 1.05 g of sodium dihydrate, 0.6 ml of oxygen, 16.7 ml of hydrolic acid and 0.23 g of structural guides and 260 ml of deionized water, prepared to WO 3 Forward fluid, ultrasonic stirring was 20 min to give the desired electrolyte.
[0047] Step three, the PS colloidal crystal template (1) as the working electrode, silver / silver chloride as the reference electrode, the platinum sheet is deposited in the void of the PS microsphere as the three-electrode system of the electrode. WO 3 Electrodeposition 270s. After the end of the fill, flush 5 times with ethanol and deionized water, N 2 Get wo after drying in the atmosphere 3 / PS photonic crystal film.
[0048] Step four, will step three wo 3 / PS photonic crystal film is placed in tetrahydrofuran so soaked in tetrahydrofuran, and then the speed of 1 ° C / min is raised to 480 ° C in the tube furnace under the air atmosphere. 3 Anti-protein stone.
[0049] Step 5. Configure 1 concoton, 6.3 g of sodium sulfate and 0.012 g of surfactants with 220 ml deionized water mixed solution, and ultrasonic stirring 19min to obtain the desired electrolyte.
[0050] Step six, take the step four WO 3 The anti-protein stone is the working electrode, under the three electrode system, at 1.4V constant potential in WO 3 Above the backbone of the anti-protein stone PEDOT 6S to get WO 3 / PEDOT Nuclear Shell Photonic Crystal Electrochromic Thin Film.

Example Embodiment

[0051] Example 3
[0052] Step 1, a parent-treated FTO glass is used as a substrate, and the concentration of 0.13 wt% of the concentration of 0.13 wt% is perpendicular to the PS microspheres, and the oven is filled with water volatilization to obtain a PS colloidal crystal crystal template arranged in the rule.
[0053] Step 2, 1 g of sodium dihydrate, 0.65 ml of hydrogenated, 16.8 ml of hydrica chloric acid and 0.23 g of the guide agent were mixed with 260 ml of deionized water, prepared to WO 3 Forward fluid, ultrasonic stirring was 25 min to give the desired electrolyte.
[0054] Step three, the PS colloidal crystal template (1) as the working electrode, silver / silver chloride as the reference electrode, the platinum sheet is deposited in the void of the PS microsphere as the three-electrode system of the electrode. WO 3 Electrodeposition 320S. After the end of the fill, flush 4 times with ethanol and deionized water, N 2 Get wo after drying in the atmosphere 3 / PS photonic crystal film.
[0055] Step four, will step three wo 3 / PS photonic crystal film is placed in tetrahydrofuran soaking 24 h, after removal, then at a temperature of 1 ° C / min at a temperature of 1 ° C / min under the air atmosphere, heat insulation for 2 h, resulting in WO 3 Anti-protein stone.
[0056] Step 5, 1 Gedot, 6.9 g sodium sulfate and 0.013 g of surfactant were mixed with 230 mL deionized water, and the desired electrolyte was obtained by ultrasonic stirring 21 min.
[0057] Step six, take the step four WO 3 Anti-protein stone is a working electrode, under the three electrode system, at 1.3V constant potential in WO 3 Above the backbone of the skeleton of the anti-protein, PEDOT 5S, get wo 3 / PEDOT Nuclear Shell Photonic Crystal Electrochromic Thin Film.
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PUM

PropertyMeasurementUnit
Aperture680.0nm
The inside diameter of510.0nm
Thickness85.0nm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • Improve cycle stability
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