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Schottky contact-based H2 gas sensor. (a) Schmatic representation of the sensor comprising aligned SWCNTs bridged across the Pd microelectrode. (b) Band diagram of the sensor when exposed to H2, which decreased the work function of Pd and created a Schottky barrier. (c) Sensing response to various concentrations of H2. Reproduced with permission from Ref. 84. Copyright 2014, American Chemical Society.
