MOF-derived synthesis of mesoporous In/Ga oxides and their ultra-sensitive ethanol-sensing properties. Issue 30 (18th July 2018)

• Record Type: Journal Article
• Authors: Cui, Y. F.; Jiang, W.; Liang, S.; Zhu, L. F.; Yao, Y. W.
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 30(2018)
• Page Start: 14930
• Page End: 14938
• Publication Date: 2018-07-18
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta00269j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A series of mesoporous indium gallium oxide (IGOs) powders with hexagonal morphology were prepared by calcining MOF (In/Ga) precursors. Abstract : A series of In/Ga-based MIL-68s, with batch molar ratios of In(iii ) to Ga(iii ) (In/Ga ratio) equaling 5 : 0, 4 : 1, 3 : 2, 1 : 1, 2 : 3, 1 : 4, and 0 : 5, were solvothermally prepared. Calcinating the as-prepared MOFs at 500 °C for 3 h produced a series of mesoporous In/Ga oxides (IGOs) of hexagonal morphology with a characteristic main pore radius of 3 nm to 12 nm, and a specific surface area of up to 60–135 m 2 g −1 . Studies on the ethanol gas-sensing properties of the as-prepared IGOs revealed that the two IGOs produced from MIL-68 with In/Ga ratios of 3 : 2 and 1 : 1 present high response values of 80–110 towards 300 ppm ethanol and a low detection limit of no more than 2 ppm. However, the response value of In2 O3, produced from MIL-68 with an In/Ga ratio of 5 : 0, was 11 towards 300 ppm ethanol. At the same time, the two IGO samples exhibited a high response to ethanol, which was more than 2.6 times higher than response values towards CH3 CHO, CH3 COCH3, H2, CO, CH4, and NO2, at a concentration of 300 ppm. This gas-sensing performance is suggested to be attributed to their comparatively larger specific surface area, and remarkable oxygen vacancy capabilities.