Quantum-sized ZnO nanoparticles synthesized in aqueous medium for toxic gases detection

Dianqing Li, Jingwei Hu, Faying Fan, Shouli Bai, Ruixian Luo, Aifan Chen, Chung Chiun Liu

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


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 NO 2 in environment. The sensing tests indicate that the ZnO sensing material not only has high response to NO 2 but also exhibits high selectivity to CO and CH 4 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.

Original languageEnglish
Pages (from-to)205-209
Number of pages5
JournalJournal of Alloys and Compounds
StatePublished - 25 Oct 2012


  • Aqueous medium
  • Quantum-size ZnO
  • Toxic gases


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