Recent Progress in Ohmic/Schottky-Contacted ZnO Nanowire Sensors

Figure 12

Piezotronic effect on the performance of an individual ZnO NW-based room temperature oxygen sensor (a) SEM images of ZnO NWs. The inset is a high-magnification image of an individual wire (top right) and optical microscopy image of a ZnO NW oxygen sensor device (bottom). (b) Schematic of the measurement setups for studying the piezotronic effect in a ZnO NW oxygen sensor (c) 3D graph depicting the current response of the ZnO NW oxygen sensor under different strains and oxygen pressures at a bias voltage equal to 1 V. (d) Magnitude of relative current change with oxygen pressure under different tensile strain from 0% to 0.2% at a bias voltage of 1 V. ((e)-(f)) Corresponding results of Figure 12 (c, d) at bias voltage of −1 V [74]. Copyright 2013, John Wiley and Sons.

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