Preparation of homogeneous porous Zn-CoOx and its response to alcohols under relative low operating temperature

A homogeneous porous Co3 O4-ZnO nanomaterial(Zn-CoOx)was successfully fabricated by precipitationannealing route.The as-prepared Zn-CoOx exhibited good response,reliable reversibility and good selectivity towards alcohols,which attributed to the porous structure and p-n heterojunction formed between Co3 O4 and ZnO.In particular,the different Fermi levels of Co3 O4 and ZnO leaded to a further increase the depth of the space charge layer,which improved the gas sensitivity of the material from 10%to 480%.Besides,the continuous CO3 O4 leaded to a relatively lower operating temperature and resista nce.This material preparation method and bimetallic oxides could be widely used in the research and development of metal oxide gas sensitive materials and sensors.