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 | |
| 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 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Analytical Chemistry
- Electrochemistry
- Electrical and Electronic Engineering
Cite this
Preparation of size and habit-controlled nano crystallites of tungsten oxide. / Choi, Yong Gyu; Sakai, Go; Shimanoe, Kengo; Teraoka, Yasutake; Miura, Norio; Yamazoe, Noboru.
In: Sensors and Actuators, B: Chemical, Vol. 93, No. 1-3, 01.08.2003, p. 486-494.Research output: Contribution to journal › Conference article
}
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.
UR - http://www.scopus.com/inward/record.url?scp=0037773385&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0037773385&partnerID=8YFLogxK
U2 - 10.1016/S0925-4005(03)00195-3
DO - 10.1016/S0925-4005(03)00195-3
M3 - Conference article
AN - SCOPUS:0037773385
VL - 93
SP - 486
EP - 494
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
SN - 0925-4005
IS - 1-3
ER -