有機電解質の薄膜を用いる交流検出型気体センサの研究

研究了一种基于电阻抗测量的表面改性电化学气体传感器的特性。用有机功能材料组成的薄膜修饰电极表面；由于表面膜和被分析物之间的化学相互作用而引起的探头电阻抗特性的变化被用作感觉原理。本研究由两部分组成。首先，利用合成的分子双层形成的两亲体，我们开发了一种湿度传感器。在互指形式的图案金电极上制备了透明的多层薄膜。利用自动阻抗分析仪测量了湿度变化的电响应。传感器的响应时间在几分钟内，具有良好的再现性。接下来，我们合成了新的双官能团长链烷硫醇，它含有一个有机官能团，用于制造电极表面。利用二烷基二硫醚的18冠-6衍生物，研制了氨传感器。将分子膜吸附在银电极表面，用阻抗计测量电极的电响应。该传感器在暴露于样品气体后几分钟内给出稳态响应，并且可以在ppm左右的浓度下测定氨气。检出限为2ppm，未见苯、氯仿等有机气体的干扰。

Title : Development of Electrochemical Gas Sensors based on an Electrical Impedance Characteristics of a Surface-modified ElectrodeElectrochemical gas sensors based on an electrical impedance measurement were investigated. An electrode surface was modified with a thin film which was composed of organic functional material ; change in an electrical impedance property of the probe due to a chemical interaction between the surface film and analytes was utilized as sensory principle.The present study consists from two parts. First, with using a synthetic, molecular-bilayer forming amphiphile, we developed a humidity sensor. A transparent thin multi-bilayer film was fabricated on patterned gold electrodes of interdigitated form. An electrical response to humidity change was obtained by using an automatic impedance analyzer. Response time of the sensor was within several minutes, and the sensor showed a good reproducibility.Next, we synthesized new, bifunctional, long-chain alkanethiols which contain an organic functional group for fabrication of surfaces of electrodes. With using a 18-crown-6 derivative of dialkyl disulfide, an ammonia sensor was developed. A molecular film was adsorbed on a silver electrode surface, and the electrical response was obtained by using an impedance meter. The sensor gave a steady-state response in a few minutes after exposure to a sample gas, and the determination of ammonia gas at around ppm revel was possible. The detection limit was 2 ppm, and interference by organic gases such as benzene and chloroform was not observed.