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Highly dispersed gold nanoparticles on nitrogen doped carbon nanotubes for hydrogen sensing

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8 Author(s)
A. Z. Sadek ; Applied Physics, School of Applied Sciences, RMIT University, Melbourne, VIC 3001, Australia ; A. Moafi ; D. M. Lau ; D. G. McCulloch
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Highly dispersed gold (Au) nanoparticles (NPs) supported on nitrogen doped multi-walled carbon nanotubes (NCNTs) were synthesised using a simple electrochemical method. Morphology of Au-NPs and their dispersion profile were studied depending on the applied potential and deposition duration. Novel conductometric gas sensors were developed from the thin films of Au-NPs/NCNTs nanocomposites and evaluated towards H2 gas. Electron microscopy revealed that the Au-NPs were deposited homogeneously on the outer surface of the NCNTs. The average size of the Au-NPs is 5 nm when the applied potential is 10 V for 10 mins and 10 nm when the applied potential is 20 V for 10 mins. The sensors were exposed to different concentrations of H2 in synthetic air at room temperature. The highest sensitivity of 75% was measured towards 1% H2 when average size of Au-NPs on NCNTs is 5 nm.

Published in:

Sensors, 2010 IEEE

Date of Conference:

1-4 Nov. 2010