Development of olfactory and taste sensor based on the dynamical information in nonlinear response

1.嗅觉传感器基于陶瓷气体传感器的非线性动态响应中所蕴含的信息，我们开发了一种用于区分不同气体种类并评估其各自浓度的传感系统。作为这条线路上的一个传感系统，我们证实了周期性加热电流作用下的动态响应可以作为有用的信息源。在实际的气体分析实验中，我们的传感系统能够分辨出各种碳氢化合物中的碳数，这在目前的气体传感技术中几乎是不可能的。考虑到吸附/脱附和氧化反应等动力学效应，我们借助计算机模拟对非线性响应进行了分析。从这些结果可以看出，我们的传感系统适合于各种实际应用。2.味觉传感器为了开发检测水环境中各种化学物质的传感器，我们尝试在金属表面制作稳定的传感膜作为检测器。利用紫外可见光谱、傅里叶变换红外光谱和扫描电子显微镜对金属表面的物理化学状态进行评价已成为可能。通过这些研究，人们有可能在多种金属表面构建稳定的化学传感膜。这些膜有望在未来实现味觉的应用中发挥作用。

1.Olfactory SensorWe have developed the sensing system to the discriminate different gas species and also to evaluate their individual concentrations, based on the information embedded in nonlinear dynamical response of ceramic gas sensor. As a sensing system along this line, we have confirmed that the dynamic response with the application of periodic heating current can serve as the useful informational source. In the actual experiment on the analysis of gases, we have shown that our sensing system can discriminate the carbon number in various hydrocarbon, which has been almost impossible in the current technology of gas sensing. We have analyzed the nonlinear response with the aid of computer simulation, taking into consideration of kinetic effects such as absorption/desorption and oxidative reaction. From there results, it becomes apparent that our sensing system is suitable for various kinds of practical applications.2.Taste SensorIn order to develop the sensor to detect various chemical species in aqueous environment, we have tried to make stable sensing membrane on metal surface as the detector. It has become possible to evaluate the physico-chemical state at the metal surface by use of UV,FTIR and SEM.From such studies, it has become possible to construct stable chemical sensing membrane on several kinds of metal surface. These membranes are expected to be suitable for the future application towards the realization of taste sensation.