Facile one-pot synthesis of tungsten oxide (WO3-x) nanoparticles using sub and supercritical fluids

Minsoo Kim; Byung Yong Lee; Hyung Chul Ham; Jonghee Han; Suk Woo Nam; Hong Shik Lee; Joo Hoon Park; Sun Choi; Youhwan Shin

doi:10.1016/j.supflu.2016.01.011

Facile one-pot synthesis of tungsten oxide (WO_3-x) nanoparticles using sub and supercritical fluids

Minsoo Kim
, Byung Yong Lee
, Hyung Chul Ham
, Jonghee Han
, Suk Woo Nam
, Hong Shik Lee
, Joo Hoon Park
, Sun Choi
, Youhwan Shin^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

Tungsten oxide (WO₃) and tungsten blue oxide (WO_3-x) were synthesized using sub and supercritical water and methanol. Crystalline tungsten oxides were formed with subcritical water at 250°C, which shows lower production temperature compared to conventional solid-state methods. Glycerol hydrothermal reduction and supercritical methanol were both found to be effective in obtaining crystalline tungsten blue oxides and this is a great advantage since hydrogen is not required in the process. The synthesized particles were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and near edge X-ray absorption fine structure (NEXAFS). NEXAFS results showed that sub and supercritical methanol was more effective in reduction of tungsten oxides compared to glycerol hydrothermal reduction.

Original language	English
Pages (from-to)	8-13
Number of pages	6
Journal	Journal of Supercritical Fluids
Volume	111
DOIs	https://doi.org/10.1016/j.supflu.2016.01.011
Publication status	Published - 2016 May 1

Bibliographical note

Publisher Copyright:
© 2016 Elsevier B.V. All rights reserved.

Keywords

Glycerol
Supercritical methanol
Supercritical water
Tungsten blue oxide
Tungsten oxide

ASJC Scopus subject areas

General Chemical Engineering
Condensed Matter Physics
Physical and Theoretical Chemistry

Access to Document

10.1016/j.supflu.2016.01.011

Cite this

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title = "Facile one-pot synthesis of tungsten oxide (WO3-x) nanoparticles using sub and supercritical fluids",

abstract = "Tungsten oxide (WO3) and tungsten blue oxide (WO3-x) were synthesized using sub and supercritical water and methanol. Crystalline tungsten oxides were formed with subcritical water at 250°C, which shows lower production temperature compared to conventional solid-state methods. Glycerol hydrothermal reduction and supercritical methanol were both found to be effective in obtaining crystalline tungsten blue oxides and this is a great advantage since hydrogen is not required in the process. The synthesized particles were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and near edge X-ray absorption fine structure (NEXAFS). NEXAFS results showed that sub and supercritical methanol was more effective in reduction of tungsten oxides compared to glycerol hydrothermal reduction.",

keywords = "Glycerol, Supercritical methanol, Supercritical water, Tungsten blue oxide, Tungsten oxide",

author = "Minsoo Kim and Lee, \{Byung Yong\} and Ham, \{Hyung Chul\} and Jonghee Han and Nam, \{Suk Woo\} and Lee, \{Hong Shik\} and Park, \{Joo Hoon\} and Sun Choi and Youhwan Shin",

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doi = "10.1016/j.supflu.2016.01.011",

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T1 - Facile one-pot synthesis of tungsten oxide (WO3-x) nanoparticles using sub and supercritical fluids

AU - Kim, Minsoo

AU - Lee, Byung Yong

AU - Ham, Hyung Chul

AU - Han, Jonghee

AU - Nam, Suk Woo

AU - Lee, Hong Shik

AU - Park, Joo Hoon

AU - Choi, Sun

AU - Shin, Youhwan

PY - 2016/5/1

Y1 - 2016/5/1

N2 - Tungsten oxide (WO3) and tungsten blue oxide (WO3-x) were synthesized using sub and supercritical water and methanol. Crystalline tungsten oxides were formed with subcritical water at 250°C, which shows lower production temperature compared to conventional solid-state methods. Glycerol hydrothermal reduction and supercritical methanol were both found to be effective in obtaining crystalline tungsten blue oxides and this is a great advantage since hydrogen is not required in the process. The synthesized particles were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and near edge X-ray absorption fine structure (NEXAFS). NEXAFS results showed that sub and supercritical methanol was more effective in reduction of tungsten oxides compared to glycerol hydrothermal reduction.

AB - Tungsten oxide (WO3) and tungsten blue oxide (WO3-x) were synthesized using sub and supercritical water and methanol. Crystalline tungsten oxides were formed with subcritical water at 250°C, which shows lower production temperature compared to conventional solid-state methods. Glycerol hydrothermal reduction and supercritical methanol were both found to be effective in obtaining crystalline tungsten blue oxides and this is a great advantage since hydrogen is not required in the process. The synthesized particles were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and near edge X-ray absorption fine structure (NEXAFS). NEXAFS results showed that sub and supercritical methanol was more effective in reduction of tungsten oxides compared to glycerol hydrothermal reduction.

KW - Glycerol

KW - Supercritical methanol

KW - Supercritical water

KW - Tungsten blue oxide

KW - Tungsten oxide

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