Flexible electrochemical sensor based on a ZnO-doped SnO 2 heterojunction for simultaneous electrochemical determination of p -aminophenol and acetaminophen Mengdie Yang a, 1 , Jiabao Zuo a, 1 , Yanan Pan a , Gaifang Lv b , Qi Yang a , Yang Fan a , Fan Qiu a , Shupeng Zhang a, * ...