SURFACE-CHEMISTRY OF GAS SENSORS - H2S ON WO3 FILMS

被引：37

作者：

DWYER, DJ

机构：

[1] Department of Chemistry, Laboratory for Surface Science and Technology, Sawyer Research Center, Orono

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 1991年 / 5卷 / 1-4期

关键词：

D O I：

10.1016/0925-4005(91)80237-E

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The surface chemistry that drives the macroscopic electrical response of WO3 hydrogen sulfide detectors has been studied by X-ray photoelectron spectroscopy (XPS) on well-defined surfaces prepared in ultra-high vacuum (UHV). H2S has been shown to interact chemically with the WO3 such that oxygen is removed from the surface. The oxidation and reduction of oxygen vacancies in the surface is the principal mechanism by which the device operates.

引用

页码：155 / 159

页数：5

共 6 条

[1] DEFECT STATES IN WO3 STUDIED WITH PHOTOELECTRON-SPECTROSCOPY [J].

BRINGANS, RD ;

HOCHST, H ;

SHANKS, HR .

PHYSICAL REVIEW B, 1981, 24 (06) :3481-3489

[2] CORE-LEVEL SHIFTS AND OXIDATION-STATES OF TA AND W - ELECTRON-SPECTROSCOPY FOR CHEMICAL-ANALYSIS APPLIED TO SURFACES [J].

HIMPSEL, FJ ;

MORAR, JF ;

MCFEELY, FR ;

POLLAK, RA ;

HOLLINGER, G .

PHYSICAL REVIEW B, 1984, 30 (12) :7236-7241

[3] SURFACE PROCESSES IN THE DETECTION OF REDUCING GASES WITH SNO2-BASED DEVICES [J].

KOHL, D .

SENSORS AND ACTUATORS, 1989, 18 (01) :71-113

[4] SELECTIVITY IN SEMICONDUCTOR GAS SENSORS [J].

MORRISON, SR .

SENSORS AND ACTUATORS, 1987, 12 (04) :425-440

[5] HYDROGEN-SULFIDE SURFACE ACOUSTIC-WAVE GAS DETECTOR [J].

VETELINO, JF ;

LADE, RK ;

FALCONER, RS .

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, 1987, 34 (02) :156-161

[6] ELECTRICAL-PROPERTIES OF TUNGSTEN TRIOXIDE FILMS [J].

XU, Z ;

VETELINO, JF ;

LEC, R ;

PARKER, DC .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 1990, 8 (04) :3634-3638

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