Gwiy-Sang Chung
University of Ulsan, South Korea
Title: Piezo-plasmonic effects of Ag nanoparticels decorated ZnO nanorods and its flexible acetylene gas sensing properties
Biography
Biography: Gwiy-Sang Chung
Abstract
In this work, piezoelectric and plasmonic effects on a flexible acetylene (C2H2) sensor based on silver (Ag) nanoparticles (NPs) decorated zinc-oxide (ZnO) nanorods (NRs) were realized. Using visible light illumination, the sensing properties can be modulated and the power consumption can be reduced significantly. Upon exposure to 1000 ppm C2H2 under 8.36 mWcm-2 light illumination, the power consumption of the sensor noticeably reduced from 3.48 W (in dark) to 1.64 W. A large number of light induced chemisorbed oxygen ions were generated in the Ag-coated ZnO NRs forest due to the strong coupling effect between the surface plasmon Ag NPs and the ZnO NRs. This resulted in increased surface charge densities, which facilitated the sensor to react with the C2H2 molecules at lower operating temperature, and hence reduce the power requirement. Moreover, the sensor exhibited reliable detection of C2H2 gas within the concentration of 3-1000 ppm including a maximum sensor response of 26.16, response-recovery time of 66/68 sec, excellent mechanical stability of a bending angle up to 90o, and 104 cycles of repeated deformation processes. These results might facilitate research in developing a low power C2H2 sensor and will open up new approaches for future light modulated gas sensors.