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Chemical analysis based on nonlinearity : Evaluation of a target species in a mixture sample.

基于非线性的化学分析：评估混合物样品中的目标物质。

基本信息

批准号：
14540559
负责人：
NAKATA Satoshi
金额：
$ 2.3万
依托单位：
Nara University of Education
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540559/
关键词：
nonlinear gas sensor analytical chemistry semiconductor tin dioxide temperature modulation reaction-diffusion kinetics

项目摘要

In this study, we investigated that the dynamic sensor responses to sample gases tinder a periodic temperature change were characteristically enhanced by higher-harmonic perturbation. These effects are reflected by the amplitude in FET, i.e., the nature of sensor response can be evaluated by the higher harmonics. The characteristic dynamic sensor response stimulated by the second-harmonic perturbation was theoretically simulated based on a reaction-diffusion model for the semiconductor sensor surface. We also demonstrated that the nonlinear sensor response enhanced by temperature perturbation can provide useful information for the analysis of a sample gas.Although we have demonstrated only the second harmonic perturbation at θ_2=π/6 in addition to the fundamental harmonic, the selectivity of the sensor response will be enhanced by choosing other higher harmonic perturbation because the nonlinear response changes depending on the chemical species. In order to find the optimal condition from the theoretical point of view, the effects on the sensor responses under the temperature perturbation should be clarified by further investigation, e.g., the reactions between sample gases on the sensor surface should be considered along with the dependence of the semiconductor barrier height on the status of the adsorbed gas and the Debye length [21,32] in the present model.

在这项研究中，我们调查的动态传感器响应样品气体tinder一个周期性的温度变化的特征增强高次谐波扰动。这些影响通过FET中的振幅反映出来，即，传感器响应的性质可以通过高次谐波来评估。基于半导体传感器表面的反应扩散模型，对二次谐波扰动激励下的传感器动态响应特性进行了理论模拟。我们还证明了温度扰动增强的非线性传感器响应可以为样品气体的分析提供有用的信息，虽然我们只证明了在θ_2=π/6处的二次谐波扰动和基波扰动，但由于非线性响应随化学物种的变化而变化，因此选择其他高次谐波扰动将增强传感器响应的选择性。为了从理论的角度找到最佳条件，应该通过进一步的研究来澄清温度扰动对传感器响应的影响，例如，在本模型中，应沿着半导体势垒高度对吸附气体状态和德拜长度的依赖关系，考虑传感器表面上样品气体之间的反应[21，32]。