Fahimeh Hooriabad Saboor, Seyed Parsa Amouzesh, Abbas Ali Khodadadi, Yadollah Mortazavi
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Highly selective ethanol detection on sheet-like ZnO sensor synthesized by microemulsion
Sheet-like ZnO nanoparticles (SZNs) were synthesized using a microemulsion method and characterized by XRD, BET, DRS, and FESEM techniques. These nanoparticles were then utilized as selective ethanol sensors operating at temperatures between 300 and 450 °C. When precursor ZnO concentrations were high, the average particle size of the SZNs increased, which was reflected in the sharper diffraction peaks observed in the XRD results. The low band gap of SZNs, attributed to their 2D morphology, was confirmed by the Tauc diagram. The SZN sensors demonstrated a remarkable selectivity for ethanol, with response levels up to 77 times higher than for CO and 3700 times higher than for CH4, achieving a limit of detection between 2.7 and 13.3 ppm. By fine-tuning the microemulsion conditions, the SZN4 sensor achieved an exceptionally high response to ethanol, about 106 times, and up to 30 times higher compared to TCE, toluene, and propane. Furthermore, the SZN4 and SZN5 sensors exhibited a relative insensitivity to humidity, with only a 26% and 17% reduction in ethanol response, respectively.
期刊介绍：
Transition Metal Chemistry is an international journal designed to deal with all aspects of the subject embodied in the title: the preparation of transition metal-based molecular compounds of all kinds (including complexes of the Group 12 elements), their structural, physical, kinetic, catalytic and biological properties, their use in chemical synthesis as well as their application in the widest context, their role in naturally occurring systems etc.
Manuscripts submitted to the journal should be of broad appeal to the readership and for this reason, papers which are confined to more specialised studies such as the measurement of solution phase equilibria or thermal decomposition studies, or papers which include extensive material on f-block elements, or papers dealing with non-molecular materials, will not normally be considered for publication. Work describing new ligands or coordination geometries must provide sufficient evidence for the confident assignment of structural formulae; this will usually take the form of one or more X-ray crystal structures.
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