supported by the National Basic Research Program of China(Grant Nos.2013CB934304 and 2011CB933700);the National Natural Science Foundation of China(Grant Nos.61374017,61071054,61104205,31571567 and 61573334)
Metal oxide-based gas sensors have been widely used in portable systems for conventional gas or volatile organic compound(VOC)vapor detection because of their fascinating advantages such as low cost,easy production,co...