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Optimizing and improving the surface activity of Co 3 O 4 sensing materials are crucial for applications in triethylamine detection. Herein, indium-doped Co 3 O 4 hollow microflowers (InCo HMfs), assembled from ultrathin nanosheets, were prepared via a hydrolysis reaction. Three distinct crystal facets─1 1 0, 1 1 1, and 0 0 1─were observed in 2-InCo HMfs. Results from TEM, XPS, and XAS characterization show that the increase of Co 2+ content induced by indium doping promotes the formation of highly active crystal planes in Co 3 O 4. DFT calculations revealed the reasons for the improvement in the gas sensing performance of 2-InCo HMfs and the multiple effects of In ions. Our dual strategy of doping with indium and hydrolysis markedly improved the intrinsic TEA sensing performance of Co 3 O 4, offering a novel avenue for designing high-performance TEA sensors.
Zheng et al. (Thu,) studied this question.