Effect of gas adsorption on the performance of Piezoelectric nanogenerators based on ZnO nanosheets

In this paper, we report fabrication of piezoelectric nanogenerator (NG) based on ZnO nanosheets. ZnOnanosheets are grown by hydrothermal method on Al substrate which creates ohmic contact with ZnO nanostructures.Ni is used as the upper electrode which creates Schottky contact at the upper interface of nanostructures. After packingthe prepared nanogenerator, electrical characteristics of the NG is investigated before and after exposing to differentgas specious. It is believed that exposing the NG to gas molecules, changes the density of free carriers at the surface ofnanosheets which alters the output characteristics of the piezoelectric nanostructures. Also, it should be noted that thegrown nanosheets have a high surface area which amplifies the effect of gas absorption on the fabricated NGs. All inall, it is shown here, that the piezoelectric signal generated by the fabricated NG can serve not only as a power source,but also as a response signal to the gas, demonstrating a possible approach as an efficient self-powered active gassensor.

کلیدواژه ها:

ZnO nanosheets ، nanogenerator ، piezoelectric