Big Data and Network Management Center;
Qingdao Agricultural University;
Qingdao 266109;
China;
School of Mechanical Electronic and Information Engineering;
China University of Mining and Technology-Beijing;
Beijing 10083;
China;
School of Material Science and Engineering;
State Key Laboratory of Bio-Fibers and Eco-Textiles;
Qingdao University;
Qingdao 266071;
China;
School of Electronics and Information;
State Key Laboratory of Bio-Fibers and Eco-Textiles;
Qingdao University;
Qingdao 266071;
China;
Shanghai Key Laboratory of Multidimensional Information Processing;
School of Communication and Electronic Engineering;
East China Normal University;
Shanghai 200241;
China;
Metal oxides; Heterojunction; Chemiresistori Ethanol sensor; Synergistic behavior;