香り識別センサの検討とミカンの香り識別システムの開発

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Until now transient response and steady-state response characteristics of SnOィイD22ィエD2 gas sensor for the hydrogen and various alcohol molecules are examined, and it has been clarified that the discrimination of the smell using polarizability and second order polarizability of smell molecule. The reaction process between SnOィイD22ィエD2 cluster-surface and various gas molecules were simulated on the computer to examine the mechanism of the difference between smell and sensor response. It was shown that the heat of formation is the smallest in the case of lack of two oxygen atoms in the case of perpendicular planes of c-axis and lack of one oxygen atom in the case of perpendicular planes of a-axis. The reaction path of hydrogen, methanol and ethanol molecule and HィイD1+ィエD1, CHィイD3+(/)3ィエD3 and CHィイD23ィエD2CHィイD3+(/)2ィエD3 radicals on the SnOィイD22ィエD2 along a- and c-axis has been studied to estimate the activation energy. As a result the hydrogen and methanol molecule react to SnOィイD22ィエD2 surface with oxygen molecule on the surface. These suggest that the resistance change of SnOィイD22ィエD2 sensor for hydrogen is lager than methanol, which is agrees with experimental results. Much knowledge was given about reaction mechanism between SnOィイD22ィエD2 sensor and smell molecule.