Surface silver clusters as oxidation catalysts on semiconductor gas sensors
| Autor: | Jianping Zhang, Konrad Colbow |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Auger electron spectroscopy
Scanning electron microscope business.industry Chemistry Metals and Alloys Analytical chemistry Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis Semiconductor Operating temperature Electrical resistivity and conductivity Materials Chemistry Cluster (physics) Gas detector Electrical and Electronic Engineering business Instrumentation |
| Zdroj: | Sensors and Actuators B: Chemical. 40:47-52 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/s0925-4005(97)80198-0 |
| Popis: | We have investigated silver clusters on SnO2 thin-film surfaces by scanning electron microscopy (SEM), Auger electron spectroscopy (AES) and X-ray diffraction (XRD). These clusters act as catalytic activators on SnO2 gas sensors and improve sensor performance for H2 detection compared to untreated surfaces. The sensitivity is found to be dependent on the operating temperature of the sensors and the amount of Ag additives, which influences the cluster details. Cluster formation occurs reproducibly on heating the sample to about 350 °C, followed by cooling to 300 °C. The experimental results show that the best sensor performance is achieved by evaporating an Ag layer of 4 to 6 nm thickness and operating the sensor at 300 °C. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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