In situ thermal, optical, and structural investigations on reversible thermochromism in bismuth molybdate

Zhang, Hongjie; Zhu, Tianli; Xia, Fang; Cui, Yuanyuan; Xia, Hui; Yang, Guang; Gao, Yanfeng

doi:10.1016/j.ceramint.2021.05.316

Cited by 12 publications

(4 citation statements)

References 62 publications

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“…自然界中的生物, 通过对环境的感知, 调节自身外形尺寸和细胞的大小, 产生可逆的结构变色. 通过仿生技术, 学者们制备出了光致变色 [1,2] 、热致变色 [3,4] 、气致变色 [5−7] 和电致变色 [8−10] 等可逆变色材料. 其中电致变色(electrochromism, EC)因响应时间短、条件可控、施加电压低、适用性广等优点成为近年来的研究热点.…”

Section: 引言unclassified

Growth behavior of WO3 crystal topological structure and its electrochromic properties

Guang-Wei¹,

Rui²,

Fu³

et al. 2022

Acta Phys. Sin.

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In this work, WO3 crystal structure films are deposited on conductive glass substrates by seed layer assisted hydrothermal reaction method. Through controlling the concentration of hydrochloric acid, oxalic acid, and the hydrothermal postprocessing temperature, the micro-peony, micro urchin-like, and porous petal-like WO3 crystal structures are obtained respectively. Scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and electrochemical characterization are used to study the formation mechanism of different structures and their effects on the electrochromic properties of WO3 films. The Cl– in HCl has a strong promoting role towards the c axis in WO3 crystal growth and oxalic acid has a promoting effect towards an a axis. In terms of color efficiency, the CE value of micro-urchin is 42.37 cm2/C, far greater than those of two other WO3 structures, 15.21 cm2/C and 12.71 cm2/C. Owing to the cold-water quenching treatment, the CE value of WO3 micro-peony with porous surface structure is 56.95 cm2/C, quadruple CE value of the smooth surface structure, slightly better than that of the micro-urchin structure.

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Section: 引言unclassified

Growth behavior of WO3 crystal topological structure and its electrochromic properties

Guang-Wei¹,

Rui²,

Fu³

et al. 2022

Acta Phys. Sin.

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“…36,37 Meanwhile, the change in temperature and the coordination field of the chromophores can cause changes in the electronic structure and bandgap width, leading to changes in color. 38 Therefore, perovskite with chrome may have potential thermochromic effects. Materials doped with transition metal elements exhibit different colors due to d-d transition, and the doping of different transition metal elements will have different effects.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, elemental doping affects the electronic structure and introduces impurity energy levels, which enhances polarization between ions at high temperatures and promotes charge‐transfer reactions 36,37 . Meanwhile, the change in temperature and the coordination field of the chromophores can cause changes in the electronic structure and bandgap width, leading to changes in color 38 . Therefore, perovskite with chrome may have potential thermochromic effects.…”

Section: Introductionmentioning

confidence: 99%

Combined experimental and DFT study on high‐temperature thermochromism of Co‐doped LaCrO₃ coating for thermal indicator

Tong

Wang

et al. 2023

J Am Ceram Soc.

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Noncontact temperature measurement using thermochromic materials is vital in the field of temperature indication, but the related mechanisms behind thermochromic behavior are diverse and high complexity, and the color‐temperature correspondence is poorly explored. This paper systematically studied the thermochromic mechanisms and color‐temperature correspondence in the cobalt‐doped LaCrO3 coatings via experiment and density functional theory study. The coatings appear reversible thermochromism from green to black with temperature and composition, functions from room temperature to 700°C. This thermochromism is attributed to the lattice expansion and bandgap reduction as the temperature increase, and a model of temperature effect bandgap was proposed. Meanwhile, the coating temperature can be inferred from the color change because the CIE chromaticity coordinate of the coating varies linearly with temperature, and the mean relative error of thermochromic measurements is 8.28%. Furthermore, the cobalt doped introduces impurity energy levels and enhances the interaction between photons and carriers, which reduce the bandgap and increase the absorption in the visible spectrum resulting in darker colors. This work provides a stable and efficient high‐temperature thermochromic coating that has a wide thermochromic temperature range and clear color‐temperature correspondence, which shows broad application prospects in the field of thermal indication at high temperatures.

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“…25 In the case of phase-transitioninduced thermochromism, VO 2 shows an insulator-to-metal state transition near room temperature with a strong absorption spectroscopy difference in the near-infrared to far-infrared region, 26,27 which is suggested to be the most promising thermally controlled smart window material. 3 For chargetransfer-induced thermochromism, reversible thermochromic properties have been observed in many bismuth oxides, such as (Bi 1-x Y x ) 2 O 3 (0.05 r x r 0.25), 28 Bi 2 Mo 3 O 12 , 29 and BiVO 4 , 30,31 which are based on the thermally induced charge transfer between the oxygen and bismuth atoms. Garnet-type thermochromic materials are based on the mechanism of thermalinduced lattice expansion, which elongates the chemical bonds of Fe-O, and therefore shifts the absorption spectra and observed color change.…”

Section: Introductionmentioning

confidence: 99%

Chromaticity coordinate vector principle for charge-transfer-type thermochromic material design: case of Fe/Cr-(co)doped α-Al₂O₃host

Zhang

Wang

et al. 2022

J. Mater. Chem. C

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In situ thermal, optical, and structural investigations on reversible thermochromism in bismuth molybdate

Cited by 12 publications

References 62 publications

Growth behavior of WO<sub>3 </sub>crystal topological structure and its electrochromic properties

Growth behavior of WO<sub>3 </sub>crystal topological structure and its electrochromic properties

Combined experimental and DFT study on high‐temperature thermochromism of Co‐doped LaCrO₃ coating for thermal indicator

Chromaticity coordinate vector principle for charge-transfer-type thermochromic material design: case of Fe/Cr-(co)doped α-Al₂O₃host

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In situ thermal, optical, and structural investigations on reversible thermochromism in bismuth molybdate

Cited by 12 publications

References 62 publications

Growth behavior of WO<sub>3 </sub>crystal topological structure and its electrochromic properties

Growth behavior of WO<sub>3 </sub>crystal topological structure and its electrochromic properties

Combined experimental and DFT study on high‐temperature thermochromism of Co‐doped LaCrO3 coating for thermal indicator

Chromaticity coordinate vector principle for charge-transfer-type thermochromic material design: case of Fe/Cr-(co)doped α-Al2O3host

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Product

Resources

About

Combined experimental and DFT study on high‐temperature thermochromism of Co‐doped LaCrO₃ coating for thermal indicator

Chromaticity coordinate vector principle for charge-transfer-type thermochromic material design: case of Fe/Cr-(co)doped α-Al₂O₃host