银掺杂氧化锌基乙炔气体传感器的检测特性研究

Study on C_2H_2 detection characteristics of Ag-doped ZnO nanoparticle gas sensor

乙炔(C_2H_2)气体是运行电力变压器油中溶解的主要故障特征气体之一,能有效反映变压器的放电故障;气体检测传感器及其检测特性是实现故障气体在线分析的关键。提出一种金属银(Ag)掺杂氧化锌(ZnO)基的纳米传感器,基于实验室微量气体平台研究其对C_2H_2气体的检测特性及气敏机理。结果表明:由于Ag掺杂以后为ZnO表面引入了杂质能级,掺杂后的ZnO纳米传感器表现出比未掺杂更高的灵敏度和更快的响应特性,并保持良好的线性度和稳定性。该结果为高性能ZnO基C_2H_2气体传感器的研究提供了新思路。

Acetylene gas （ C2 H2 ） is one of the main fault characteristic gases dissolved in power transformer oil, which can indicate the transformer discharge faults effectively. The gas sensor technology and its detection characteristics are the key of the fault gas on-line monitoring. In this paper, an Ag-doped ZnO nanoparticle gas sensor is proposed, the detection characteristics of the sensor to the C2 H2 gas and its gas sensitive mechanism are investigated based on the laboratory trace gas platform. The fabrication method and test procedure of the gas sensor are introduced. The results prove that due to the doping of Ag, the impurity energy level is formed on the ZnO surface, which makes the doped gas sensor show higher sensitivity and faster response characteristic to C2H2 and also remain good linearity and stability compared with the pure ZnO gas sensor. These results present a feasible way to develop high- performance ZnO-based C2H2 gas sensor.