In situ investigations of the phase change behaviour of tungsten oxide nanostructures

Royal Society Open Science
Kunyapat ThummavichaiYanqiu Zhu

Abstract

This study uses two in situ techniques to investigate the geometry and phase change behaviour of bundled ultrathin W18O49 nanowires and WO3 nanoparticles. The in situ X-ray diffraction (XRD) results have shown that the phase transition of WO3 nanoparticles occurs in sequence from monoclinic (room temperature) → orthorhombic (350°C) → tetragonal (800°C), akin to bulk WO3; however, W18O49 nanowires remain stable as the monoclinic phase up to 500°C, after which a complete oxidation to WO3 and transformation to the orthorhombic β-phase at 550°C is observed. The in situ Raman spectroscopy investigations have revealed the Raman peak downshifts as the temperature increases, and have identified the 187.6 cm-1 as the fingerprint band for the phase transition from γ- to β-phase of the WO3 nanoparticle. Furthermore, WO3 nanoparticles exhibit the γ- to β-phase conversion at 275°C, which is about 75°C lower than the relaxation temperature of 350°C for the monoclinic γ-W18O49 nanowires. These new fundamental understandings on the phase transition behaviour offer important guidance for the design and development of tungsten oxide-based nanodevices by defining their allowed operating conditions.

References

Jul 14, 2010·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Jian ChenChengxin Wang
Jul 30, 2008·Nanotechnology·Shibin SunYanqiu Zhu
Nov 5, 2014·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Yossy WicaksanaRose Amal

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Methods Mentioned

BETA
X-ray
electron microscopy

Software Mentioned

DIFFRAC
. EVA

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