Gas sensing with vertical functionalized InAs nanowire arrays
conference paper
Nanowires show great promise for use in next generation (bio-)chemical sensing devices because of their high surface to volume ratio enabling efficient modulation of their current by charges or dipoles present at the surface. Here, we present a gas sensing device based on vertical InAs nanowire arrays grown without metal catalyst particles. The nanowires are contacted ohmically in their as-grown locations using an air bridge construction, leaving the nanowire surface free for gas adsorption. Noise measurements were performed to determine the measurement resolution for gas detection. The bare devices show sensitivity to NO\2 concentrations well below 75 ppb at room temperature. We furthermore find that these nanowires can be functionalized with metalloporphyrins resulting in sensitivity to both NO\2 and NO concentrations below 75 ppb.
Topics
TNO Identifier
461498
ISSN
18777058
Source title
24th Eurosensors Conference, 5 September 2010 through 8 September 2010, Linz
Pages
1111-1114
Files
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