Fabrication and optical performance of W-VO2/PVP/AAO composite structure in visual and near infrared band. (December 2022)

• Record Type: Journal Article
• Authors: Liang, Jiran; Yang, Zhe; Zhang, Dequan; Wang, Shuangli; Zhang, Hairun; Tai, Wanwan
• Is Part Of: Materials today communications. Volume 33(2022)
• Publication Date: 2022-12
• Subjects: Thermal properties -- Composite materials -- Nanoparticles; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2022.104534
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: Vanadium dioxide with tungsten doping (W-VO2 ), Polyvinylpyrrolidone (PVP) and anodic aluminum oxide (AAO) composite structure (W-VO2 /PVP/AAO) was fabricated by introducing the W-VO2 /PVP solution into pores of AAO by capillary force. The morphology and optical performance were studied. W-VO2 /PVP can form compact distribution in pores of AAO by increasing the stickiness, and then enhance the visible light transmittance and solar modulation ability simultaneous. We optimized the thickness of W-VO2 /PVP/AAO with continuous distribution in pore, and the visible light transmittance and solar modulation ability can reach up to 64.7% and 19.2%, respectively. This result will benefit to the application of VO2 nanoparticles in smart windows. Graphical Abstract: Vanadium dioxide (VO2 ) is a thermochromic material and has great application potential in smart windows for energy conversion. It has been the focus of research on improving the visible light transmittance ( T lum ) and solar modulation ability (Δ T sol ) while reducing the phase transition temperature ( T c ) of VO2 . To achieve this goal, we designed and constructed a composite structure by W-VO2 NPs with a T c of 34 ℃ and PVP in AAO, as shown in Fig. c. We studied the effect of W-VO2 concentration, stickiness and thickness of film on the thermochromic performance of composite films and optimized these parameters according to the performance of T lum and Δ T sol . We found that the T lum can reach up to 64.7% and the Δ T sol reach up to 19.2% with continuous distribution in pore. This work provides a new idea for enhancing the thermochromic performance and promoting the development of VO2 thermochromic smart windows. ga1