Vertically distributed VO2 nanoplatelets on hollow spheres with enhanced thermochromic properties

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

1 Scopus Citations
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Author(s)

  • Zhengfei Dai
  • Chen Wang
  • Kewei Xu
  • Fei Ma

Detail(s)

Original languageEnglish
Pages (from-to)7896-7904
Journal / PublicationJournal of Materials Chemistry C
Volume6
Issue number29
Early online date3 Jul 2018
Publication statusPublished - 7 Aug 2018

Abstract

Vanadium dioxide (VO2) is a phase-transition material exhibiting great potential in the field of smart windows for energy saving. Herein, VO2 nanoplatelets vertically distributed on hollow spheres are synthesized via a template-free hydrothermal method. The nanoplatelets are separated and uniformly arranged on the spheres so that the dispersion and optical properties are greatly improved. Compared with the observations for the aggregated sample, visible transmittance (Tvis) and solar modulation (ΔTsol) improve from 33% to 50% and from 5.2% to 11.2%, respectively. Meanwhile, a large contrast transmittance of 60% at 2500 nm is obtained. Tvis increases with gradual reduction in ΔTsol as the film thickness is reduced. Ultrahigh Tvis of 87.2% and satisfactory ΔTsol of 5.3% are obtained. Furthermore, the as-obtained VO2 hierarchical structure exhibits higher sensitivity than VO2 nanoparticles owing to 2D-structures of nanoplatelets. This study demonstrates a promising 2D structure for promoting practical applications in smart windows.