Construction of Znco2o4 Decorated Zno Heterostructure Materials for Sensing Triethylamine with Dramatically Enhanced Performace

Abstract

In this paper, ZnCo 2 O 4 /ZnO heterostructure materials were prepared by one-pot method and subsequent high temperature calcination. The phase and morphology of all as-prepared samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS) and transmission electron microscopy (TEM). The optimal working temperature of the 5 at%- ZnCo 2 O 4 /ZnO sensor is 280 °C, and the response value of the 5 at% - ZnCo 2 O 4 /ZnO sensor to 100 PPM triethylamine (TEA) (78.684) is almost 12 times that of the ZnO sensor (6.58). It exhibited a better linear response towards TEA in the concentration range of 5-80 PPM, and has better selectivity and repeatability than pure ZnO sensor. The sensitization mechanism of the sensor is also analyzed.

Keywords: ZnCo2O4/ZnO composites, heterostructure, TEA, sensor, mechanism