Abstract
Vertical InAs nanowires are contacted in situ using an air-bridge construction and functionalized with a metalloporphyrin (Hemin). The response of bare and functionalized vertical InAs nanowire arrays to ppb-level concentrations of NO 2 and NO is demonstrated. Hemin enhances the response to NO whereas NO 2 is also detected without functionalization. Transconductance measurements are used to investigate the effect of gas exposure on current density and electron mobility. Furthermore, the signal-to-noise ratio is shown to increase with the number of contacted nanowires, underlining the application of dense vertical nanowire arrays for sensing. Nanowire self-heating strongly enhances gas desorption, decreasing the recovery time.
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