Room temperature hydrogen detection using Pd-coated GaN nanowires

Lim, Wantae; Wright, J. S.; Gila, B. P.; Johnson, Jason L.; Ural, Ant; Anderson, Travis; Ren, F.; Pearton, S. J.
August 2008
Applied Physics Letters;8/18/2008, Vol. 93 Issue 7, p072109
Academic Journal
Multiple GaN nanowires produced by thermal chemical vapor deposition were employed as gas sensors for detection of hydrogen at concentrations from 200–1500 ppm in N2 at 300 K. Palladium coating of the wires improved the sensitivity by a factor of up to 11 at low ppm concentrations relative to uncoated controls. The GaN nanowires showed relative responses of ∼7.4% at 200 ppm and ∼9.1% at 1500 ppm H2 in N2 after a 10 min exposure. Upon removal of hydrogen from the measurement ambient, ∼90% of the initial GaN conductance was recovered within 2 min. Temperature dependent measurements showed a larger relative response and shorter response time at elevated temperature. The adsorption activation energy of the sensor was 2.2 kcal mol-1 at 3000 ppm H2 in N2. These sensors exhibit low power consumption (<0.6 mW) at 300 K.


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