서강대학교

초록/요약

This paper report the characterization of micro and nanostructured materials and their applications to energy harvester and sensors. The proposed devices can be applied for utilize in daily life by using the movements of body to harvest energy, detect movements and environmental information, so notify information to users. The proposed devices and experimental results carried out the piezo-electric energy harvester, the piezo-resistive strain sensor, and chemical-resistive gas sensor based on nanostructured materials, respectively. The device, integrated with both a piezoelectric energy harvester based on zinc oxide nanorods and piezoresistive sensor based on silver nanowire into a single stretchable silicone polymer, results in a self-powered monitoring system for skin strain. By using a simple method, in the case of gas sensor, the surface of sensing area are maximized that can respond to gas. As a result, a peak output power of 133 W have been achieved and correspond to output power density of 21 mW/m2 at 2Hz. The mechanical stability, high stretchability of up to 100% , high conductivity and good output power at extremely low frequency (<4 Hz) suggested that when attached to the skin of human, this device would be able to utilize and detect small strains induced by ordinary human motion, and we confirmed this experimentally. In the case of a hydrogen gas sensor using a nanostructure, a hydrogen gas sensor was fabricated by depositing palladium on a NiCo2O4 nanostructure formed by hydrothermal synthesis. The surface area of the nanostructure was increased by forming a nanostructure on the surface of the substrate by a simple method, and palladium having excellent reactivity to hydrogen ions was applied to the surface of the nanostructure. As the surface area of the palladium deposited on the surface of the nanostructure was increased as compared with that of the plate substrate, the reactivity to the hydrogen ion was improved. The proposed hydrogen gas sensor has a simple, low - cost fabrication process and shows linear response speed and sensitivity at 500 to 20000 ppm at room temperature.