Application of CuO-ZnO Composite Film/Tin Doped Glass Waveguide Sensor for VOCs Detection
Metal oxide semiconductor gas sensing materials are widely used in the sensors fields due to its good stability and excellent optoelectronic properties.And the gas sensing properties of them can be regulated by doping.In this paper,the CuO-ZnO composite materials prepared by sol-gel method which using Cu(NO₃)₂as dopant,ZnCl2 and Zn(NO₃)₂as raw materials,respectively.And the CuO-ZnO as sensing materials prepare the CuO-ZnO composite film/tin doped glass waveguide sensor by sol-dip-coating method.The gas sensitivity of CuO-ZnO composite film optical waveguide sensors prepared from different raw materials were studied.The research results indicated that the amount of raw materials and dopants affects the gas sensitivity of sensors.The sensitivity of CuO-ZnO composite film optical waveguide sensor prepared using ZnCl2 raw materials is higher than that of using Zn(NO₃)₂ raw materials.Doping of CuO improves the selectivity of optical waveguide sensor to xylene gases,and can be detect a volume ratio of 1×10-5 xylene.
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