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Hao Y, Xu W, Li M, Wang S, Liu H, Yang X, Yang J. One-Step Hydrothermal Synthesis, Thermochromic and Infrared Camouflage Properties of Vanadium Dioxide Nanorods. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3534. [PMID: 36234662 PMCID: PMC9565468 DOI: 10.3390/nano12193534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 10/08/2022] [Accepted: 10/08/2022] [Indexed: 06/16/2023]
Abstract
Vanadium dioxide (VO2) has attracted interest from researchers because it undergoes a metal-insulator phase transition (MIT), which is accompanied by a reversible and remarkable change in both electrical and optical properties. VO2 exhibits numerous polymorphs and thus it is essential to control the growth of specific monoclinic VO2 (M) and rutile VO2 (R) phases. In this study, we developed a cost-effective and facile method for preparing VO2 nanorods with a highly crystalline monoclinic phase by one-step hydrothermal synthesis, in which only V2O5 and H2C2O4 are used as raw materials. The phase evolution of VO2 during the hydrothermal process was studied. The obtained VO2 nanorods were thoroughly mixed with fluorocarbon resin and homogeneous emulsifier in an ethanol solution to obtain a VO2 dispersion. To prepare VO2 films, screen printing was performed with a stainless steel screen mesh mask on glasses or fabric substrate. The VO2 coating had good thermochromic performance; the infrared transmittance change was greater than 20% @1.5 μm whilst keeping the visible transmittance greater than 50%. Meanwhile, the polyester base coating on the fabric had an emissivity change of up to 22%, which provides a solution for adaptive IR camouflage.
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Affiliation(s)
- Youbin Hao
- Field Engineering College, Army Engineering University of PLA, Nanjing 210007, China
| | - Weidong Xu
- Field Engineering College, Army Engineering University of PLA, Nanjing 210007, China
| | - Ming Li
- Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Suhong Wang
- Field Engineering College, Army Engineering University of PLA, Nanjing 210007, China
| | - Heng Liu
- Field Engineering College, Army Engineering University of PLA, Nanjing 210007, China
| | - Xin Yang
- Field Engineering College, Army Engineering University of PLA, Nanjing 210007, China
| | - Jie Yang
- Field Engineering College, Army Engineering University of PLA, Nanjing 210007, China
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Chu X, Xie Q, Zhang X, Guo B, Liao J, Zhao X. Fabrication and Optical Characterization of VO 2-Based Thin Films Deposited on Practical Float Glass by Magnetron Sputtering and Professional Annealing. MATERIALS (BASEL, SWITZERLAND) 2022; 15:2990. [PMID: 35591325 PMCID: PMC9100224 DOI: 10.3390/ma15092990] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 04/15/2022] [Accepted: 04/18/2022] [Indexed: 11/20/2022]
Abstract
In this paper, VO2 thin films with good optical properties are fabricated on practical float glass by magnetron sputtering and a professional annealing method. The near-infrared switching efficiency (NIRSE) of the prepared film reaches 39% (@2000 nm), and its near-infrared energy modulation ability (ΔTir) reaches 10.9% (780-2500 nm). Further, the highest integral visible transmittance Tlum is 63%. The proposed method exhibits good reproducibility and does not cause any heat damage to the magnetron sputtering machine. The crystalline structure of the VO2 film is characterized by X-ray diffraction (XRD). The lattice planes (011) and (-211) grow preferentially (JCPDS 65-2358), and a large number of NaV2O5 crystals are detected simultaneously. The microstructures are characterized by scanning electron microscopy (SEM), and a large number of long sheet crystals are identified. The phase transition temperature is significantly reduced by an appropriate W doping concentration (Tc = 29 °C), whereas excessive W doping causes distortion of the thermal hysteresis loop and a reduction in the NIRSE. Oxygen vacancies are created by low pressure annealing, due to which the phase transition temperature of VO2 film decreases by 8 °C. The addition of an intermediate SiO2 layer can prevent the diffusion of Na+ ions and affect the preparation process of the VO2 thin film.
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Affiliation(s)
- Xinhong Chu
- College of Physics Science and Engineering Technology, Yichun University, Yichun 336000, China; (Q.X.); (X.Z.); (B.G.); (J.L.)
| | - Qiusheng Xie
- College of Physics Science and Engineering Technology, Yichun University, Yichun 336000, China; (Q.X.); (X.Z.); (B.G.); (J.L.)
| | - Xiaoming Zhang
- College of Physics Science and Engineering Technology, Yichun University, Yichun 336000, China; (Q.X.); (X.Z.); (B.G.); (J.L.)
| | - Bingfeng Guo
- College of Physics Science and Engineering Technology, Yichun University, Yichun 336000, China; (Q.X.); (X.Z.); (B.G.); (J.L.)
| | - Jianqing Liao
- College of Physics Science and Engineering Technology, Yichun University, Yichun 336000, China; (Q.X.); (X.Z.); (B.G.); (J.L.)
| | - Xiujian Zhao
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China
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Feng YQ, Lv ML, Yang M, Ma WX, Zhang G, Yu YZ, Wu YQ, Li HB, Liu DZ, Yang YS. Application of New Energy Thermochromic Composite Thermosensitive Materials of Smart Windows in Recent Years. Molecules 2022; 27:1638. [PMID: 35268739 PMCID: PMC8912046 DOI: 10.3390/molecules27051638] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 12/30/2021] [Accepted: 12/30/2021] [Indexed: 11/16/2022] Open
Abstract
Thermochromic smart windows technology can intelligently regulate indoor solar radiation by changing indoor light transmittance in response to thermal stimulation, thus reducing energy consumption of the building. In recent years, with the development of new energy-saving materials and the combination with practical technology, energy-saving smart windows technology has received more and more attention from scientific research. Based on the summary of thermochromic smart windows by Yi Long research groups, this review described the applications of thermal responsive organic materials in smart windows, including poly(N-isopropylacrylamide) (PNIPAm) hydrogels, hydroxypropyl cellulose (HPC) hydrogels, ionic liquids and liquid crystals. Besides, the mechanism of various organic materials and the properties of functional materials were also introduced. Finally, opportunities and challenges relating to thermochromic smart windows and prospects for future development are discussed.
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Affiliation(s)
- Yu-Qin Feng
- Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing & Finishing, School of Chemistry and Engineering, Wuhan Textile University, 1 Textile Road, Wuhan 430073, China; (Y.-Q.F.); (M.Y.); (W.-X.M.); (G.Z.); (Y.-Z.Y.); (Y.-Q.W.); (H.-B.L.)
| | - Mei-Ling Lv
- Department of Mechanical Electricity, Wuhan Instrument and Electronic Technical School, Wuhan 430074, China;
| | - Ming Yang
- Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing & Finishing, School of Chemistry and Engineering, Wuhan Textile University, 1 Textile Road, Wuhan 430073, China; (Y.-Q.F.); (M.Y.); (W.-X.M.); (G.Z.); (Y.-Z.Y.); (Y.-Q.W.); (H.-B.L.)
| | - Wen-Xia Ma
- Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing & Finishing, School of Chemistry and Engineering, Wuhan Textile University, 1 Textile Road, Wuhan 430073, China; (Y.-Q.F.); (M.Y.); (W.-X.M.); (G.Z.); (Y.-Z.Y.); (Y.-Q.W.); (H.-B.L.)
| | - Gang Zhang
- Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing & Finishing, School of Chemistry and Engineering, Wuhan Textile University, 1 Textile Road, Wuhan 430073, China; (Y.-Q.F.); (M.Y.); (W.-X.M.); (G.Z.); (Y.-Z.Y.); (Y.-Q.W.); (H.-B.L.)
| | - Yun-Zi Yu
- Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing & Finishing, School of Chemistry and Engineering, Wuhan Textile University, 1 Textile Road, Wuhan 430073, China; (Y.-Q.F.); (M.Y.); (W.-X.M.); (G.Z.); (Y.-Z.Y.); (Y.-Q.W.); (H.-B.L.)
| | - Ya-Qi Wu
- Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing & Finishing, School of Chemistry and Engineering, Wuhan Textile University, 1 Textile Road, Wuhan 430073, China; (Y.-Q.F.); (M.Y.); (W.-X.M.); (G.Z.); (Y.-Z.Y.); (Y.-Q.W.); (H.-B.L.)
| | - Hai-Bo Li
- Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing & Finishing, School of Chemistry and Engineering, Wuhan Textile University, 1 Textile Road, Wuhan 430073, China; (Y.-Q.F.); (M.Y.); (W.-X.M.); (G.Z.); (Y.-Z.Y.); (Y.-Q.W.); (H.-B.L.)
| | - De-Zheng Liu
- Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle, Hubei University of Arts and Science, Xiangyang 441053, China
| | - Yong-Sheng Yang
- Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing & Finishing, School of Chemistry and Engineering, Wuhan Textile University, 1 Textile Road, Wuhan 430073, China; (Y.-Q.F.); (M.Y.); (W.-X.M.); (G.Z.); (Y.-Z.Y.); (Y.-Q.W.); (H.-B.L.)
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Optically Modulated Passive Broadband Daytime Radiative Cooling Materials Can Cool Cities in Summer and Heat Cities in Winter. SUSTAINABILITY 2022. [DOI: 10.3390/su14031110] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Broadband passive daytime radiative cooling (PDRC) materials exhibit sub-ambient surface temperatures and contribute highly to mitigating extreme urban heat during the warm period. However, their application may cause undesired overcooling problems in winter. This study aims to assess, on a city scale, different solutions to overcome the winter overcooling penalty derived from using PDRC materials. Furthermore, a mesoscale urban modeling system assesses the potential of the optical modulation of reflectance (ρ) and emissivity (ε) to reduce, minimize, or reverse the overcooling penalty. The alteration of heat flux components, air temperature modification, ground and roof surface temperature, and the urban canopy temperature are assessed. The maximum decrease of the winter ambient temperature using standard PDRC materials is 1.1 °C and 0.8 °C for daytime and nighttime, respectively, while the ρ+ε-modulation can increase the ambient temperature up to 0.4 °C and 1.4 °C, respectively, compared to the use of conventional materials. Compared with the control case, the maximum decrease of net radiation inflow occurred at the peak hour, reducing by 192.7 Wm−2 for the PDRC materials, 5.4 Wm−2 for ρ-modulated PDRC materials, and 173.7 Wm−2 for ε-PDRC materials; nevertheless, the ρ+ε-modulated PDRC materials increased the maximum net radiation inflow by 51.5 Wm−2, leading to heating of the cities during the winter.
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