Lots of explosive sensors have been proposed and demonstrated in the past two decades, resorting to several approaches, including chemical, electrochemical, biosensors, and optical sensors, with a clear trend to exploit the characteristics of nanomaterials. 11 , 15 − 17 Nanomaterials possess unique chemical and physical properties with respect to their bulk counterparts, providing new opportunities for the fabrication of gas sensors with improvements of sensitivity and selectivity, such as increased sur
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