Preparation of size and habit-controlled nano crystallites of tungsten oxide

Yong Gyu Choi; Go Sakai; Kengo Shimanoe; Yasutake Teraoka; Norio Miura; Noboru Yamazoe

doi:10.1016/S0925-4005(03)00195-3

Preparation of size and habit-controlled nano crystallites of tungsten oxide

Yong Gyu Choi, Go Sakai, Kengo Shimanoe, Yasutake Teraoka, Norio Miura, Noboru Yamazoe

Functional Materials Science

Research output: Contribution to journal › Conference article › peer-review

34 Citations (Scopus)

Abstract

An aqueous sol dispersing nano crystallites of WO₃·2H₂O was subjected to a centrifugal treatment for 1 or 10 h, to obtain two kinds of WO₃·2H₂O gels with very different morphology of crystals. The WO₃ thick film devices fabricated with these gels were investigated for several properties including NO₂ sensing characteristics. It was found that the devices prepared under proper conditions exhibited excellent NO₂ sensing properties to cover environmental standard of NO₂. The sensitivity to NO₂ as well as the rate of response depended markedly on calcination temperature of the devices. The morphology of WO₃ crystals, i.e. lamellae or disks, was almost the same as that of WO₃·2H₂O gel unless calcination temperature exceeded 500 °C. Based on the surface analysis using N₂ adsorption technique, the above changes were estimated to result from a change in microstructure of the WO₃ crystals.

Original language	English
Pages (from-to)	486-494
Number of pages	9
Journal	Sensors and Actuators, B: Chemical
Volume	93
Issue number	1-3
DOIs	https://doi.org/10.1016/S0925-4005(03)00195-3
Publication status	Published - Aug 1 2003
Event	Proceedings of the Ninth International Meeting on Chemical Engineering - Boston, MA, United States Duration: Jul 7 2003 → Jul 10 2003

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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title = "Preparation of size and habit-controlled nano crystallites of tungsten oxide",

abstract = "An aqueous sol dispersing nano crystallites of WO3·2H2O was subjected to a centrifugal treatment for 1 or 10 h, to obtain two kinds of WO3·2H2O gels with very different morphology of crystals. The WO3 thick film devices fabricated with these gels were investigated for several properties including NO2 sensing characteristics. It was found that the devices prepared under proper conditions exhibited excellent NO2 sensing properties to cover environmental standard of NO2. The sensitivity to NO2 as well as the rate of response depended markedly on calcination temperature of the devices. The morphology of WO3 crystals, i.e. lamellae or disks, was almost the same as that of WO3·2H2O gel unless calcination temperature exceeded 500 °C. Based on the surface analysis using N2 adsorption technique, the above changes were estimated to result from a change in microstructure of the WO3 crystals.",

author = "Choi, {Yong Gyu} and Go Sakai and Kengo Shimanoe and Yasutake Teraoka and Norio Miura and Noboru Yamazoe",

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note = "Proceedings of the Ninth International Meeting on Chemical Engineering ; Conference date: 07-07-2003 Through 10-07-2003",

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TY - JOUR

T1 - Preparation of size and habit-controlled nano crystallites of tungsten oxide

AU - Choi, Yong Gyu

AU - Sakai, Go

AU - Shimanoe, Kengo

AU - Teraoka, Yasutake

AU - Miura, Norio

AU - Yamazoe, Noboru

PY - 2003/8/1

Y1 - 2003/8/1

N2 - An aqueous sol dispersing nano crystallites of WO3·2H2O was subjected to a centrifugal treatment for 1 or 10 h, to obtain two kinds of WO3·2H2O gels with very different morphology of crystals. The WO3 thick film devices fabricated with these gels were investigated for several properties including NO2 sensing characteristics. It was found that the devices prepared under proper conditions exhibited excellent NO2 sensing properties to cover environmental standard of NO2. The sensitivity to NO2 as well as the rate of response depended markedly on calcination temperature of the devices. The morphology of WO3 crystals, i.e. lamellae or disks, was almost the same as that of WO3·2H2O gel unless calcination temperature exceeded 500 °C. Based on the surface analysis using N2 adsorption technique, the above changes were estimated to result from a change in microstructure of the WO3 crystals.

AB - An aqueous sol dispersing nano crystallites of WO3·2H2O was subjected to a centrifugal treatment for 1 or 10 h, to obtain two kinds of WO3·2H2O gels with very different morphology of crystals. The WO3 thick film devices fabricated with these gels were investigated for several properties including NO2 sensing characteristics. It was found that the devices prepared under proper conditions exhibited excellent NO2 sensing properties to cover environmental standard of NO2. The sensitivity to NO2 as well as the rate of response depended markedly on calcination temperature of the devices. The morphology of WO3 crystals, i.e. lamellae or disks, was almost the same as that of WO3·2H2O gel unless calcination temperature exceeded 500 °C. Based on the surface analysis using N2 adsorption technique, the above changes were estimated to result from a change in microstructure of the WO3 crystals.

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JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

SN - 0925-4005

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T2 - Proceedings of the Ninth International Meeting on Chemical Engineering

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