Synthesis of 1D ZnO Crystals and Sensing Properties for ${\rm NO}_{2}$ Gas

One-dimensional (1D) ZnO nanocrystals with different morphologies and sizes including pencil-like, flower-like and needle-like, have been hydrothermally synthesized with cetyltrimethyl ammonium bromide (CTAB), sodium dodecyl sulphate (SDS), and polyethylene glycol (PEG) assisted. This paper focuses on the material synthesis, structure and application for NO
₂
sensor. Experimental results show that the sensor based on ZnO nanorods not only had high response to NO
₂
but also exhibited high selectivity to CO and CH
₄
in same gas concentration. The response was greatly enhanced by doping Cd of transition metal, the effect of Cd loading on ZnO sensing property has been discussed by X-ray photoelectron spectroscopy (XPS) analysis.