| Project/Area Number |
14540559
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
分離・精製・検出法
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| Research Institution | Nara University of Education |
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Principal Investigator |
NAKATA Satoshi Nara University of Education, Science Education, Chemistry, Associate Professor, 教育学部, 助教授 (50217741)
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| Co-Investigator(Kenkyū-buntansha) |
NAGAYAMA Masaharu Kyoto University, Research Center of Mathematical Analysis, Mathematics, Assistant Professor, 数理解析研究所, 助手 (20314289)
MATSUYAMA Toyoki Nara University of Education, Science Education, Physics, Associate Professor, 教育学部, 助教授 (70202330)
YANAGISAWA Yasunori Nara University of Education, Science Education, Physics, Associate Professor, 教育学部, 教授 (90031591)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2003: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2002: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | nonlinear / gas sensor / analytical chemistry / semiconductor / tin dioxide / temperature modulation / reaction-diffusion / kinetics |
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| Research Abstract |
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.
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