4.6 Article

Facile Preparation of Zn2V2O7-VO2 Composite Films with Enhanced Thermochromic Properties for Smart Windows

Journal

ACS APPLIED ELECTRONIC MATERIALS
Volume 3, Issue 5, Pages 2224-2232

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsaelm.1c00176

Keywords

Zn2V2O7-VO2 composite film; magnetron sputtering; solar modulation efficiency; luminous transmittance; phase transition temperature

Funding

  1. National Natural Science Foundation of China [51772229, 52062045]
  2. 111 project [B18038]
  3. National Key R&D Program of China [2017YFE0192600]
  4. Key R&D Project of Hubei Province [2020BAB061]
  5. Open Research Fund Program of Science and Technology on Aerospace Chemical Power Laboratory [STACPL220191B02]
  6. National Innovation and Entrepreneurship Training Program [201910497034]
  7. Open Foundation of the State Key Laboratory of Silicate Materials for Architectures at WUT [SYSJJ2020-04]
  8. State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology [P2021-010]
  9. Fundamental Research Funds for the Central Universities [195201024]

Ask authors/readers for more resources

In this research, a Zn2V2O7-VO2 composite film was deposited on quartz glass to improve the optical performance, showing enhanced thermochromic performance compared to a pure VO2 film. The composite film exhibited higher T-lum and Delta T-sol due to the formation and uniform distribution of Zn2V2O7, which widened the optical band gap and improved the optical properties.
Usually, VO2 films prepared by a magnetron sputtering method exhibit good durability and excellent solar modulation efficiency (Delta T-sol). However, its undesirable low-temperature luminous transmittance (T-lum) limits its application in smart windows since the dense film composed of VO2 nanocrystals with narrow band gaps can absorb more visible light. In this work, a Zn2V2O7-VO2 composite film was deposited on quartz glass by a facile magnetron sputtering method followed by postannealing at 450 degrees C, in which transparent Zn2V2O7 aimed to improve the optical performance. The composite film showed an enhanced thermochromic performance with a Delta T-sol of 11.5%, a T-lum of 49.0%, and a phase transition temperature (T-c) of 43.8 degrees C compared with a pure VO2 film (T-lum = 34.1%, Delta T-sol = 10.9%, T-c = 49.2 degrees C). This was probably attributed to the formation and uniform distribution of Zn2V2O7 in the composite film, which could widen the optical band gap, leading to the improvement in the optical properties. The interface between Zn2V2O7 and VO2 could produce interfacial stress to reduce the phase transition temperature. Therefore, this work can provide a facile way to improve the thermochromic performance of VO2-based films and promote their application in the field of energy-saving glass.

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