Prototype of a Porous ZnO SPV-Based Sensor for PCB Detection at Room Temperature under Visible Light Illumination
Prototype of a Porous ZnO SPV-Based Sensor for PCB Detection at Room Temperature under Visible Light Illumination
复制标题
用于可见光照明下室温 PCB 检测的多孔 ZnO SPV 传感器原型
DOI：
10.1021/la101391x
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发表时间：
2010-08-17
期刊：
影响因子：
3.9
通讯作者：
Kong, Mingguang
中科院分区：
文献类型：
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作者：
Li, Mingtao;Meng, Guowen;Kong, Mingguang
为了检测多氯联苯（pcb），提出了一种室温可见光下工作的基于表面光电压（SPV）机制的多孔ZnO传感器原型。吸附PCB后，在可见光照射下，多孔ZnO传感器的SPV显著降低，且减小幅度与吸附的PCB分子数量成正比。我们提出SPV响应的降低是由于被吸附的多氯联苯捕获了表面态的电子。该传感器对PCB29和PCB101的检测下限分别达到2.2 mu mol/L和1.1 mu mol/L以上。因此，它在多氯联苯的痕量检测中具有很大的实际应用潜力。
To detect polychlorinated biphenyls (PCBs), a prototype of a porous ZnO sensor based on the surface photovoltage (SPV) mechanism working under visible light illumination at room temperature has been presented. The SPV of the porous ZnO sensor can be remarkably reduced under visible light illumination after PCB adsorption, and the reduction of amplitude is proportional to the population of adsorbed PCB molecules. We propose that the reduction of SPV response is due to trapping of the electrons in the surface states by the adsorbed PCBs. The lower detection limits of this new prototype sensor reach at least 2.2 mu mol/L for PCB29 and 1.1 mu mol/L for PCB101, respectively. So, it demonstrates great potential for practical application in trace detection of PCBs.