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A Hydrogen Sensor Based on Graphitic Carbon

A Hydrogen Sensor Based on Graphitic Carbon,10.1109/JSEN.2010.2100818,IEEE Sensors Journal,Ali Moafi,Jim G. Partridge,Abu Z. Sadek,Desmond W. M. Lau,K

A Hydrogen Sensor Based on Graphitic Carbon  
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A Pt/oriented graphitic carbon heterojunction has been fabricated and tested as a conductometric hydrogen gas sensor. The carbon layer, deposited between planar Au substrate contacts using a filtered cathodic vacuum arc (with an applied substrate bias of V), has a low density of 1.7 g/cm and with 67% of the atoms bonded in or graphitic configurations. Electron diffraction analysis showed evidence that the film has a microstructure consisting largely of vertically oriented graphitic sheets. These sheets have good through-film electrical conductivity and contributed to a low device resistance of . A 3-nm Pt layer was deposited subsequently on the carbon layer. A change in the device resistance of % was exhibited upon exposure to 1% hydrogen gas (in synthetic, zero humidity air) at room temperature. The time for the sensor resistance to decrease by 2% under these conditions was 60 s and the baseline (zero hydrogen exposure) resistance remained constant to within 0.03% during and after the exposure tests.
Journal: IEEE Sensors Journal - IEEE SENS J , vol. 11, no. 9, pp. 1913-1916, 2011
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