Electrical properties of a rigid nanogenerator made of biosynthesized ZnO nanostructures

González Montes de Oca Roel, Villanueva-Ibáñez Maricela, Jaramillo Loranca Blanca Estela, Castillo Ojeda Roberto Saúl

Universidad Politécnica de Pachuca

The development of nanogenerators based on lead-free piezoelectric materials is an area of great interest for their use in microelectronic devices aimed at improving the lives of human beings. In this work, nanostructured ZnO obtained by biosynthesis with aqueous extract of Schoenoplectus californicus was implemented as a piezoelectric nanogenerator of energy. The ZnO nanostructures were biosynthesized at a temperature of 30 °C for 4 h. Characterization by UV-Visible spectroscopy denoted the characteristic absorption peak of ZnO at 330 nm. Scanning electron microscopy (SEM) showed triangular flakes and nanometric prisms that integrate submicron structures. By X-ray diffraction, the hexagonal structure of ZnO with a mean crystal size at 30 nm was confirmed. With the material obtained, a tablet of diameter of 25 mm and 1 mm thick was formed, electrical contacts were wired on its faces and it was polarized at 2.8 KVDC and 100 °C. The capacitance showed an increasing variation with the frequency and is related at hysteresis loop denoting a soft piezoelectric material. The piezoelectric nanogenerator generated up to 20 volts peak-to-peak with a pressure of 1 Kg.



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