摘要： [Display omitted] ► Quantum-sized ZnO nanoparticles are synthesized in aqueous medium. ► ZnO is used to detect toxic gases in the atmosphere. ► ZnO sensing material has high sensitivity to NO2 at operating temperature of 290°C. ► ZnO based sensor exhibits high selectivity to CO and CH4. ► The intrinsic sensing of ZnO arises from stoichiometric defects. Quantum-sized ZnO nanoparticles have been prepared by the sol–gel method in aqueous medium using sodium dodecyl sulfate (SDS) as surface modifier to control the growth of ZnO particles and Ostwald ripening, because the majority of bioanalyses require water-stable materials. The crystal structure, grain size and optical property of the ZnO nanoparticles have been characterized using X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopic (XPS). The obtained quantum-sized ZnO nanoparticles as a novel sensing material have been used to detect NO2 in environment. The sensing tests indicate that the ZnO sensing material not only has high response to NO2 but also exhibits high selectivity to CO and CH4 at optimum operating temperature of 290°C. The sensing response depends on the calcination temperature of the ZnO precursor and operating temperature of the sensor. The intrinsic sensing property has also been exploited by photoluminescence (PL) and Raman spectra. 出版者： Kidlington: Elsevier B.V 出版日期： 2012-10-25 出處： Journal of alloys and compounds, 2012-10, Vol.539, p.205-209 版權： 2012 Elsevier B.V. 版權： 2015 INIST-CNRS 識別號： ISSN: 0925-8388 識別號： EISSN: 1873-4669 識別號： DOI: 10.1016/j.jallcom.2012.05.106
