Open AccessSynthesis and phase transition properties of VO 2 (M) hollow spheres with large thermal hysteresis width
Author(s) -
Zhang Yifu
Publication year - 2019
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2018.5819
Subject(s) - spheres , materials science , hysteresis , phase (matter) , vanadium , phase transition , thermal hysteresis , thermochromism , nanotechnology , nanoparticle , hydrothermal circulation , atmospheric temperature range , condensed matter physics , thermodynamics , chemical engineering , metallurgy , chemistry , physics , astronomy , organic chemistry , engineering
Thermochromic VO 2 (M) has attracted increasing attention regarding the reduction of its thermal hysteresis width (Δ T c ). However, little attention is paid to increase its Δ T c , which may have scientific importance and potential application in the future. Herein, VO 2 (M) hollow spheres assembled by nanoparticles are successfully synthesised using NH 4 VO 3 as the vanadium source by a template‐free method. Their diameters mainly range from 350 to 650 nm and thickness of shells is about 50 nm in average. The hydrothermal process plays a crucial role in the successful formation of VO 2 (M) hollow spheres. The phase transition temperature ( T c ) of VO 2 (M) hollow spheres is about 63°C in the heating curve and 32°C in the cooling curve. The Δ T c of VO 2 (M) hollow spheres reach as high as 31°C, which is distinctively higher than the reported values (ca. 5–20°C). The huge Δ T c may have potential applications in some fields in the future.