光辅助条件下神经毒剂的高灵敏度、高选择性半导体传感检测

Nerve agents such as Sarin and Tabun are of high poisonous, which can cause huge damage or even death to human in only a few minutes. Therefore, they become the choice of terrorists to conduct attacks to citizens. It is of great importance to monitor and alarm people to avoid the damage where nerve agents occur. To detect gases at room temperature is a hot topic for Metal oxides based semiconductor gas sensor, but both sensitivity and selectivity of gas sensing materials are quite poor at room temperature. In this application, the applicant proposed to detect nerve agents at room temperature with the assistance of light illumination. For one thing, light illumination can greatly enhance sensitivity of metal oxides to nerve agents, and for another, high selectivity can also be achieved by applying the selectivity of photocatalytic reactions. This application will provide new insights in nerve agents detection with high sensitivity and selectivity.

以沙林、塔崩为代表的神经毒剂在很短时间内就会对人类造成巨大伤害甚至死亡，因而成为恐怖分子进行恐怖袭击的常用手段。监测并及时提醒人们远离这类神经毒剂的侵害，具有重要的现实意义。基于金属氧化物的半导体气体传感的室温检测是当前气敏传感的研究热点，但普遍存在常温下气敏材料灵敏度较低、选择性差的缺点。本项目根据神经毒剂分子的特点，提出在光辅助条件下，利用半导体金属氧化物的光催化性能，实现半导体气体传感器室温检测神经毒剂。光辅助室温传感检测不但可以显著提高敏感材料对神经毒剂分子的灵敏度，还可以利用光催化反应的选择性，实现敏感材料对神经毒剂分子检测的高选择性，从而制备可以在室温条件下高灵敏、高精度报警的神经毒剂气体传感器。

基于金属氧化物的半导体气体传感的室温检测是当前气敏传感的研究热点，但普遍存在常温下气敏材料灵敏度较低、选择性差的缺点。本项目根据利用半导体金属氧化物的光催化性能，实现半导体气体传感器室温检测。通过与导电材料碳纳米管复合、控制缺陷生成等方式，实现了氧化钨导电性提高、能带结构调整等目标，为室温气体传感材料的研究奠定了基础。通过对电极进行的修饰，可以高选择性的实现对二价汞离子、多巴胺等重要标志物的检测，而且具有高的灵敏度和稳定性，为低廉便携的传感器研制提供了理论支持。