| Title: | Selective detection of methanol vapour from a multicomponent gas mixture using a CNPs/ZnO@ZIF-8 based room temperature solid-state sensor |
| Author(s): | Malepe L; Ndinteh DT; Ndungu P; Mamo MA; |
| Address: | "Department of Chemical Science, University of Johannesburg PO Box 17011, Doornfontein 2028 Johannesburg South Africa messaim@uj.ac.za. Department of Chemistry, University of Pretoria Private Bag X20, Hatfield 0028 Pretoria South Africa patrick.ndungu@up.ac.za" |
| ISSN/ISBN: | 2046-2069 (Electronic) 2046-2069 (Linking) |
| Abstract: | "Methanol vapour is harmful to human health if it is inhaled, swallowed, or absorbed through the skin. Solid-state gas sensors are a promising system for the detection of volatile organic compounds, unfortunately, they can have poor gas selectivity, low sensitivity, an inferior limit of detection (LOD), sensitivity towards humidity, and a need to operate at higher temperatures. A novel solid-state gas sensor was assembled using carbon nanoparticles (CNPs), prepared from a simple pyrolysis reaction, and zinc oxide@zeolitic imidazolate framework-8 nanorods (ZnO@ZIF-8 nanorods), synthesised using a hydrothermal method. The nanomaterials were characterized using scanning electron microscopy, transmission electron microscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy Raman spectroscopy, and Fourier transform infrared spectroscopy. The ZnO@ZIF-8 nanorods were inactive as a sensor, the CNPs showed some sensor activity, and the CNPs/ZnO@ZIF-8 nanorod composite performed as a viable solid-state sensor. The mass ratio of ZnO@ZIF-8 nanorods within the CNPs/ZnO@ZIF-8 nanorod composite was varied to investigate selectivity and sensitivity for the detection of ethanol, 2-propanol, acetone, ethyl acetate, chloroform, and methanol vapours. The assembled sensor composed of the CNPs/ZnO@ZIF-8 nanorod composite with a mass ratio of 1.5 : 6 showed improved gas sensing properties in the detection of methanol vapour with a LOD of 60 ppb. The sensor is insensitive to humidity and the methanol vapour sensitivity was found to be 0.51 Omega ppm(-1) when detected at room temperature" |
| Notes: | "PubMed-not-MEDLINEMalepe, Lesego Ndinteh, Derek Tantoh Ndungu, Patrick Mamo, Messai Adenew eng England 2022/10/25 RSC Adv. 2022 Sep 23; 12(42):27094-27108. doi: 10.1039/d2ra04665b. eCollection 2022 Sep 22" |
