2D metal oxide materials for multifunctional applications

2D functional metal oxide hybrid nanostructures combine the favourable properties of the constituent materials for achieving multifunctionality. Functional metal oxide nanostructures and nano hybrids have attracted significant attention for diverse applications, i.e. energy storage, mechanical energy harvesting, chemical sensing and other applications. The present talk is concerned with the engineering of the properties of the functional metal oxide nanostructures and nanocomposite prepared by the facile wet chemical method, hydrothermal and thermal decomposition method for supercapacitor, nano generators, gas sensing, and room temperature magnetic applications. With the development of the modern economy, faster and higher energy storage systems are essential for several applications. Supercapacitors are the best candidates for providing the necessary high power and long durability needed for new energy devices for uninterrupted power supply. WO_x, MnO₂, Co₃O₄ nanostructures are identified as promising materials for energy storage purposes. Further, rGO-Ag/PVDF nanocomposite was used to realize a mechanical energy harvesting device that could light LEDs, charge capacitors and harvest bio-mechanical energy. The ability to monitor indoor air quality is realized by studying the gas and humidity sensing properties of Sr- and Ni- doped ZnO nanostructures. The as fabricated chemical sensors showed good sensitivity, selectivity and stability towards H₂O, CO, CO₂, etc. The size and shape-controlled CoFe₂O₄ nanoparticles were explored for room temperature magnetic applications. The excellent magnetic properties indicated the capabilities of CoFe₂O₄ NPs in permanent magnets for current technological applications. 2D Materials for biosensor and energy applications will be discussed. (author)