Boosting triethylamine gas sensor performance via sphere–cube MoS2 /Zn2SnO4 heterojunction engineering

Triethylamine is a highly toxic volatile organic compound. In this work, The MoS 2 /Zn 2 SnO 4 was prepared by hydrothermally growing Zn 2 SnO 4 cubes uniformly anchored on MoS 2 spherical structures to detect TEA. The MoS 2 /Zn 2 SnO 4 based sensor had a much higher response of 26.4 toward 30 ppm TEA at 230 °C than that of pure MoS 2 and Zn 2 SnO 4 sensor, as well as rapid response/recovery (19 s/35 s), excellent selectivity, repeatability and stability. The superior sensing behavior of the MoS 2 /Zn 2 SnO 4 composite is likely arising from the synergistic effect of the heterojunction and the unique microstructure, which enhanced interfacial electron transport and supplies abundant reactive sites for TEA adsorption and oxidation. This study provides an effective approach for the development of efficient gas-sensing sensors based on Zn 2 SnO 4 .