Influence of dopant valence on the thermochromic properties of VO2 nanoparticles. Issue 15 (1st August 2021)

• Record Type: Journal Article
• Authors: Guo, H.; Wang, Y.G.; Fu, H.R.; Jain, Aditya; Chen, F.G.
• Is Part Of: Ceramics international. Volume 47:Issue 15(2021)
• Page Start: 21873
• Page End: 21881
• Publication Date: 2021-08-01
• Subjects: Thermochromic properties -- VO2 films -- Element doping -- Valence; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.04.205
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The effect of valence of dopants on thermochromic properties of VO2 nanoparticles are investigated. In the present work, VO2 nanoparticles were synthesized by hydrothermal method and subsequently spin coated on a glass substrate. Dopants with various valences can break the structural symmetry of the V 4+ -V 4+ chains, which results in various degrees of lattice distortion and changes in the crystal structure of VO2 . Therefore, the transition temperature ( T c ) can be associated with the valence of transition metal dopants, and it decreases with the increase of elements' valence. Meanwhile, various valence results in the changeable optical band gap ( E g ). The doping of lower valence elements results in narrowing of E g, thus leading to enhancements in both luminous transmittance ( T lum ) and solar energy modulation ability (Δ T sol ). The phase transition temperature is significantly reduced by 20.2 °C for 1% doping of W. The Zr-doped film exhibits the highest T lum and Δ T sol of 61.4% and 10.3%, respectively. The Mg-doped film has shown T lum and Δ T sol of 59.4% and 9.5%, respectively, which is slightly inferior to Zr-doped sample. It can be deduced that W/Zr and W/Mg co-doped VO2 films can improve T c, T lum, and Δ T sol, simultaneously, which can provide a potential solution for manufacturing smart windows.