Library free bulk detection of explosives – Combining simple sensors for resolving a complicated issue

Nanostructured metal oxide heterojunctions for chemiresistive gas sensors

“…23–26 Among them, various metal oxides with various chemical compositions, morphologies and structures have been recognized as gas-sensing materials with tunable sensitivity and selectivity. 27–29 Metal oxides have been extensively utilized for explosive gas detection, 30,31 identifying the leakage of hazardous compounds, 6,32 and monitoring the emissions of vehicles 33 due to their merits of high performance, simple operation devices, and suitability for large-scale applications, and they have been one of the major sensor technologies with the largest output and the widest application. 34 Nowadays, one of the most concerning drawbacks is that the operating temperatures of metal oxides are elevated ( i.e.…”