Selective gas detection using Mn₃O₄/WO₃ composites as a sensing layer

• Yongjiao Sun,
• Zhichao Yu,
• Wenda Wang,
• Pengwei Li,
• Gang Li,
• Wendong Zhang,
• Lin Chen,
• Serge Zhuivkov and
• Jie Hu

Beilstein J. Nanotechnol. 2019, 10, 1423–1433, doi:10.3762/bjnano.10.140

• detection. The devices displayed different sensing responses toward different gases at specific temperatures. The gas sensing performance of Mn3O4/WO3 composites (especially at 3 atom % Mn) were far improved compared to sensors based on pure WO3, where the improvement is related to the heterojunction formed

• door for potential applications in gas recognition and detection. Keywords: Mn3O4/WO3 composites; heterojunctions; working temperature; gas sensing; selectivity; Introduction Tungsten oxide (WO3) is a highly stable, classical transition metal oxide. When synthesized, WO3 usually presents a yellowish

• material for selective detection of gases [12]. Herein, we prepared pure WO3 and Mn3O4/WO3 composites with different concentrations of Mn (1 atom %, 3 atom % and 5 atom % Mn) by a facile hydrothermal method followed by calcination. The gas sensing performance under different temperatures to H2S, NH3 and CO