화학공학소재연구정보센터
Materials Research Bulletin, Vol.47, No.12, 4420-4426, 2012
Sensing performances of ZnO nanostructures grown under different oxygen pressures to hydrogen
For extensive use in an industrialized process of individual ZnO nanostructures applied in gas sensors, a simple, inexpensive, and safe synthesis process is required. Here, nanostructured ZnO films were grown by a pulsed laser deposition technique under different oxygen pressures. Scanning electron microscopy images show nanopores, nanotips, and nanoparticles are obtained and energy dispersive X-ray spectroscopy data indicate oxygen concentration of the synthesized samples increases monotonously with oxygen pressure. The sensor based on ZnO with high oxygen concentration has high sensitivity, rapid response (9 s) and recovery (80 s) behavior to 500 ppm hydrogen below 150 degrees C. Experimental data indicate that high oxygen concentration effectively improves the sensing properties of nanostructured ZnO. (C) 2012 Elsevier Ltd. All rights reserved.