In this paper, CuO nanoparticles were synthetized via a sol–gel method and their corresponding gas sensor was achieved simultaneously.

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The technological process for the preparation of nickel oxide nanomaterials in this work.

In this study, rose-like nickel oxide nanoparticles (diameter of 400-500 nm) were prepared on indium tin oxide (ITO) glass substrates by a simple electrodeposition in NiSO 4 Á6H 2 O solution. Scanning electron microscopy (SEM), X-ray di®raction (XRD) and transmission electron microscope (TEM) were used for analysis of the NiO nanoparticles. The e®ects of operating temperature on the sensor response and the response versus gas concentration properties of the NiO nanorose-based sensors were investigated. We determined the operating temperature of the gas sensors to be 230 C, considering the proper sensitivity and a rapid response. In addition, gassensing characteristics of rose-like NiO nanoparticles to formaldehyde were investigated. It was shown that the sensors exhibited good response (R g /R a ¼ 3:43) properties to formaldehyde gas at 230 C, making them to be promising candidates for practical detectors to formaldehyde gas.

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).