Adsorption effect of oxygen on ZnO Nanowires (100 nm) leading towards pronounced edge effects and voltage  enhancement

Mansoor Ahmada

Abstract

Here, we report high output piezoelectric voltage generation from oxidized ZnO nanowires (100nm). Periodic high output voltage peaks were observed during series of oxygen exposure experiments. Gradual rise in piezoelectric potential from oxidized ZnO nanowires is being evidenced for the very first time. Sharp voltagepeaks 464mV, 803mV, 1.354 V, 1.795V and 2.44V are observed for an exposure of oxygen for 1h, 2h, 3h, 4h and 5h respectively in a sealed chamber at 50ppm. Ithas been observed maximum output value has been saturated after 5h of O exposure. Enhanced piezoelectric potential appearing at output stages is due to the adsorption of oxygen molecules on long ZnO nanowires, giving rise to “Edge Effects” and consequently reducing reverse leakage current through nanowires and enhancing output voltage. SEM images revealed the surface morphology ZnO nanowires, diameter range was found around 100nm. XRD pattern verified vertical growth orientation of ZnO nanowires on ITO (indium Tin oxide) coated PET (poly ethylene terephthalate) substrates. Minute external force ?50nN is used to produce piezoelectric potential within nanowires.

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