2007
DOI: 10.1063/1.2779288
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Sulfur surface chemistry on the platinum gate of a silicon carbide based hydrogen sensor

Abstract: We have investigated the effects of sulfur contamination on a Pt-gate silicon carbide based field-effect gas sensor, under ultrahigh vacuum conditions, at a temperature of 527°C. Exposure to hydrogen sulfide, even in the presence of hydrogen or oxygen at partial pressures of 20-600 times greater than the H 2 S level, rapidly coated the gate with a monolayer of sulfur. Sulfur contamination reduced the magnitude of the sensor's response to alternating hydrogen and oxygen pulses by about 70%, as compared to the u… Show more

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Cited by 6 publications
(7 citation statements)
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“…One effect of the activation procedure is clearly a roughening of the Pt-gate surface that is visible both to the unaided eye and under the microscope. 27,35,36 Despite these dramatic changes in appearance, the surface composition as revealed by Auger electron spectroscopy ͑AES͒ remains pure Pt, and x-ray diffraction measurements show that the bulk crystal structure remains that of elemental platinum. The changes in the gate during activation therefore appear to be purely morphological rather than changes in composition.…”
Section: Methodsmentioning
confidence: 97%
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“…One effect of the activation procedure is clearly a roughening of the Pt-gate surface that is visible both to the unaided eye and under the microscope. 27,35,36 Despite these dramatic changes in appearance, the surface composition as revealed by Auger electron spectroscopy ͑AES͒ remains pure Pt, and x-ray diffraction measurements show that the bulk crystal structure remains that of elemental platinum. The changes in the gate during activation therefore appear to be purely morphological rather than changes in composition.…”
Section: Methodsmentioning
confidence: 97%
“…Details of cleaning, temperature control, and gas dosing can be found in Ref. 27. Electrical measurements were made in situ using a 1 MHz capacitance bridge.…”
Section: Methodsmentioning
confidence: 99%
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