Stability and controlled composition of hexagonal WO3

被引：204

作者：

Szilagyi, Imre Miklos ^{[1
]}

Madarasz, Janos ^{[2
]}

Pokol, Gyoery ^{[2
]}

Kiraly, Peter ^{[3
]}

Tarkanyi, Gabor ^{[3
]}

Saukko, Sami ^{[4
]}

Mizsei, Janos ^{[5
]}

Toth, Attila L. ^{[6
]}

Szabo, Andras ^{[7
]}

Varga-Josepovitso, Katalin ^{[8
]}

机构：

[1] Budapest Univ Technol & Econ, Hungarian Acad Sci, Mat Struct & Modeling Res Grp, H-1111 Budapest, Hungary

[2] Budapest Univ Technol & Econ, Dept Inorgan & Analyt Chem, H-1111 Budapest, Hungary

[3] Hungarian Acad Sci, Chem Res Ctr, Inst Struct Chem, H-1025 Budapest, Hungary

[4] Univ Oulu, Microelectron & Mat Phys Labs, FIN-90014 Oulu, Finland

[5] Budapest Univ Technol & Econ, Dept Electron Devices, H-1521 Budapest, Hungary

[6] Hungarian Acad Sci, Res Inst Tech Phys & Mat Sci, H-1121 Budapest, Hungary

[7] Budapest Univ Technol & Econ, Dept Organ Chem & Technol, H-1111 Budapest, Hungary

[8] Budapest Univ Technol & Econ, Dept Atom Phys, H-1111 Budapest, Hungary

来源：

CHEMISTRY OF MATERIALS | 2008年 / 20卷 / 12期

关键词：

D O I：

10.1021/cm800668x

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This paper discusses the formation of nanosized hexagonal tungsten oxide (h-WO3) during the annealing of hexagonal ammonium tungsten bronze (HATB), (NH4)(0.33-x)WO3-y. This process was investigated by TG/DTA-MS, XRD, SEM, Raman, XPS, and H-1-MAS NMR analyses. Through adjusting the temperature and atmosphere of annealing HATB, the composition (W oxidation state, residual NH4+ and NH3 content) of h-WO3 could be controlled. The effect of composition on the conductivity and gas sensitivity of h-WO3 was studied. New structural information was obtained about both HATB and h-WO3. It was found that NH4+ and NH3 could be situated at three different positions in HATB. Residual NH4+ and NH3 in the hexagonal channels seemed to be vital for stabilizing h-WO3: when they were completely released, the hexagonal framework collapsed. We propose that the structure of h-WO3 cannot be maintained without some stabilizing ions or molecules in the hexagonal channels.

引用

页码：4116 / 4125

页数：10

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