Facile Synthesis of Rose-Like NiO Nanoparticles and Their Ethanol Gas-Sensing Property **Supported by the Natural Science Foundation of Gansu Province under Grant No 1107RJZA090, the Foundation of State Key Library of Functional Materials for Informatics of Shanghai Institute of Microsystem and Information Technology, and the National Natural Science Foundation of China under Grant No 61204106.

Abstract

In this study, rose-like nickel oxide (NiO) nanoparticles with diameters of 400–500 nm are prepared on ITO glass substrates by simple electrodeposition in NiSO46H2O solution at room temperature followed by oxidation in air. Scanning electron microscopy, x-ray diffraction and a transmission electron microscope are used for analyses of the NiO nanoparticles. The ethanol gas sensitivity of these nanoparticles is studied. The results indicate that the rose-like NiO nanoparticles could be used for the fabrication of ethanol gas sensors to monitor the low concentration of ethanol gas in air. Furthermore, at 5 ppm, the NiO nanorose-based sensors show a high response to ethanol (Rg/Ra = 8.4).