Preparation and Characteristics of SiO<sub>2</sub>/VO<sub>2</sub> Double-Layer Thermochromic Coatings for Smart Window

Peng Liu; Liping Liang; Yao Xu

doi:10.3788/AOS201939.0416001

Acta Optica Sinica, Volume. 39, Issue 4, 0416001(2019)

Preparation and Characteristics of SiO₂/VO₂ Double-Layer Thermochromic Coatings for Smart Window

Peng Liu^1、*, Liping Liang^1、*, and Yao Xu^2、*

¹ Institute of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, Shanxi 0 30024, China

² State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, Shaanxi 710000, China

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Figures & Tables(9)

Fig. 1. Preparation procedures of double-layer coatings

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Fig. 2. Raman scattering spectra of samples

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Fig. 3. Top-view and cross-section SEM images of samples. (a) VSA1; (b) VSB1; (c) VSA2; (d) VSB2

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Fig. 4. AFM images and Rq values of samples. (a) VSA1; (b) VSB1; (c) VSA2; (d) VSB2

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Fig. 5. Transmittance curves of samples at different temperatures

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Fig. 6. Thermal hysteresis loops of samples at wavelength of 2000 nm during heating and cooling processes

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Table 1. Preparation conditions of double-layer coatings
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Table 1. Preparation conditions of double-layer coatings
Sample Bottom layer Top layer
CA-V(IV) VO₂ Sol_A Sol_B
VS_A1 √ √
VS_B1 √ √
VS_A2 √ √
VS_B2 √ √

Table 2. Summary of optical parameters of samples%

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Table 2. Summary of optical parameters of samples%

Sample	T_vis,L	T_vis,H	T_2000,L	T_2000,H	ΔT₂₀₀₀	T_sol,L	T_sol,H	ΔT_sol
VO₂ (prepared)	55.6	55.5	86.2	41.3	44.9	62.8	54.3	8.5
VS_A1 (prepared)	67.1	65.9	86.1	43.7	42.4	70.7	62.6	8.1
VS_B1 (prepared)	68.4	66.4	87.3	47.7	39.6	72.0	63.6	8.4
VS_A2 (prepared)	79.3	77.9	90.1	70.6	19.5	82.5	77.9	4.6
VS_B2 (prepared)	83.9	80.3	93.6	75.7	17.9	85.5	78.9	4.0
porous V ${O_{2}}^{[27]}$	71.1	70.2				72.9	65.0	7.9
VO₂ nanoplate ^[26]	70.3				37.5			9.3
VO₂/Si ${O_{2}}^{[21]}$	80.0	78.9	92.6	63.6	29.0	81.7	71.5	10.2
VO₂/SiO₂/Ti ${O_{2}}^{[17]}$	17.8	18.2				28.8	13.6	15.2
TiO₂(R)/VO₂(M)/TiO₂(A)^[28]	30.1	27.8			49.5	33.8	23.6	10.2
VO₂-SiO₂^[29]	48.5	43.2			57.4	52.9	37.2	15.7

Table 3. Parameters derived from hysteresis loops of samples at wavelength of 2000 nm during heating and cooling processes℃
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Table 3. Parameters derived from hysteresis loops of samples at wavelength of 2000 nm during heating and cooling processes℃
Sample Transition temperature Hysteresis width ΔT
T_h T_t T_c
VO₂ 54.5 48.8 43.1 11.4
VS_B1 58.4 51.2 43.9 14.5

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Peng Liu, Liping Liang, Yao Xu. Preparation and Characteristics of SiO₂/VO₂ Double-Layer Thermochromic Coatings for Smart Window[J]. Acta Optica Sinica, 2019, 39(4): 0416001

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