Multi purpose chemical sensor detecting substructure of molecules

利用动态电位扫描下的电化学阻抗测量对所制备表面上的吸附分子进行了表征。在原子尺度上，吸附表面的粗糙度和不均匀性会改变CPE（恒相元件）阻抗。因此，阻抗包括有关吸附分子子结构的信息。另一方面，表面与吸附分子之间的相互作用通过电位扫描进行修饰。因此，表面电极化的阻抗曲线可用于包含吸附物分子信息的传感器输出。还对表面进行了仪器表面表征方法。ESCA和AFM给出了吸附化学物质的信息。表征还提供了有关传感器表面设计的知识。所研究的传感器表面采用自组装单层（SAMs）化学修饰。采用简单的分子印迹技术制备SAMs表面，以获得对目标化学子结构的特异性。这种功能化表面对芳香或醇类物质具有敏感性。因此，测量的化学物质可以分为三个亚结构。分子亚结构信息与气味编码有关，可用于气味质量的评价。该传感器还可以作为一种简单的分析化学方法，利用分子亚结构信息实现化学物质的分组。

Adsorbing molecules on surfaces deveoped here were characterized using electrochemical impedance measurement under dynamic potential scan. CPE(constant phase element) impedance is altered by roughness and inhomogeneity of the adsorbing surface in atomic scale. Consequently, the impedance includes information about adsorbing molecular substructures. On the other hand, interaction between surface and adsorbing molecules is modified by means of potential scan. Thus, the impedance profiles by surface electrical polarization can be used for sensor output which contains molecular information about adsorbates.Instrumental surface characterizing methods were also carried out on the surface. ESCA and AFM gave information about adsorbing chemicals. The characterization also provides knowledge about design of the sensor surface.Investigated sensor surface was modified chemically using SAMs (self assembled monolayer). Simple molecular imprinting was used on fabrication of SAMs surface to get specificity to target chemical substructure. Such functionalized surface had sensitivity to aromatic or alcoholic substances.Consequently, measured chemicals could be categorized into there substructures. The information about molecular substructures relates to odor code, which can be used for evaluation of odor quality. The developed sensor also works as a simple method for analytical chemistry, which can realizes grouping of chemicals using the information about molecular substructure.