纳米化学阻抗传感器阵列对可挥发性有机气体的响应模式探讨

The Study of Different Sensor Modes for God-nanoparticles SensorArray to Violatile Organic Compounds(VOCs)

目的利用不同粒径的硫醇包裹的金纳米粒子敏感膜组成的化学阻抗传感器对可挥发性有机气体有较好的电化学响应特性,组成传感器阵列对其进行检测和分析。方法两相法合成两种粒径大小的硫醇包裹的金纳米粒子(Au:S分别为4:1和8:1),将两种颗粒金纳米粒子进行色谱提纯,然后分别将提纯前后的金纳米粒子的涂覆于叉指微电极上组成化学阻抗传感器阵列对不同的挥发性有机气体进行检测分析。结果不同颗粒度和提纯前后的金纳米粒子敏感膜传感器对几种常见的可挥发性有机气体有不同的电阻和电容响应模式。结论化学阻抗传感器阵列对混合气体中不同的可挥发性有机气体有很好的分析和鉴别能力。

Objective In order to discriminate different violatile organic compounds （VOCs）with two different core sizes of n - oetanethiolate - capped gold nanoparticles as chemically sensitive layers on chemiresistor vapor sensors which have different resistance and capacitance responses to VOCs. Methods Octanethiol monolayer - protected gold （nano）clusters （MPCs） at the Au/thiolate mole ratio of 4：1 and 8：1 were synthesized by a Brust two - phase method and purified with column chromatograph, respectively, and used as chemically sensitive layers on ehemiresistor vapor sensors for detection of VOCs. Results The results indicate that nanopartiele size,impurities of nanopartieles and the dielectric constant of analyte displayed influence on the resistance and the eapaeitance. The four sensors have different resistance and capacitance responses for VOCs）. Conclusion The response pattern showed that the sensor array could discriminate VOCs with different functional groups.