CHANGE OF FERRIC-OXIDE (FE2O3) SEMICONDUCTOR CONDUCTIVITY TYPE IN THE INTERACTION WITH REDUCING GASES

被引：23

作者：

VASILIEV, AA

POLYKARPOV, MA

机构：

[1] Kurchatov Institute of Atomic Energy

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 1992年 / 7卷 / 1-3期

关键词：

D O I：

10.1016/0925-4005(92)80376-9

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The interaction processes between semiconductor ferric oxide (alpha-Fe2O3) obtained by different methods and reducing gases are investigated. It is shown that only alpha-Fe2O3 doped by 1 wt.% ZnO changes its conductivity type from p to n when adsorbing such gases. The long-term stability of a semiconductor gas sensor made of undoped alpha-Fe2O3 and alpha-Fe2O3 doped by SO42-. Zn2+ and Sn4+ ions is studied. The most stable is the alpha-Fe2O3 + 20% SnO2 reducing gas sensor. Its conductivity changes less than 5% per month. These properties of alpha-Fe2O3 are associated with the Mossbauer spectra of the materials under investigation. A new type of semiconductor gas-sensing device based on a gas-controlled p-n junction is suggested.

引用

页码：626 / 629

页数：4