“…Humankind will soon need new materials and specialized techniques for energy harvesting to enable smart systems. Thus, developing energy harvesting materials and technologies that can harvest energy from the environment, such as mechanical vibration (triboelectric), − heat (hhermoelectric), , piezoelectric (stress-induced), , pyroelectric, , tides/waves (hydroelectric), magnetic field (magnetoelectric), environmental humidity (hydrovoltaic), , etc., to generate electrical power for self-power devices is very necessary. In 2006, Wang et al developed the first piezoelectric nanogenerator using ZnO nanowire, which created a new avenue in the nanogenerator field.…”