DEVELOPMENT NH3 GAS SENSORS AT ROOM TEMPERATURE BASED ON CNT/WO3 NANOBRICK COMPOSITE

Abstract

Incorporation of carbon nanotubes (CNTs) with WO3 metal oxides nanoparticles would improve NH3 gas sensing properties. In this work, CNTs was incorporated into tungsten oxide (WO₃) nanoparticles using simple ultrasonication method. The morphology of CNTs/ WO₃ composites were observed with field-emission scanning electron microscopy (FE-SEM). The CNTs/ WO₃ nanocomposite showed good sensing response towards NH₃ at 60 ppm, and more remarkably at room temperature. The enhanced sensing properties might be attributed to the formation of heterojunction and synergistic effect between CNTs and WO₃.