| 초록 |
In recent years, global warming has become a serious world-wide environmental problem. Since CO2 is a greenhouse effect gas and contributes much to global warming, the detection of CO2 has attracted interest from environmental perspective. Electrochemical sensors using solid electrolyte show several advantages compared to other systems such as optical analysis instruments. Solid state electrochemical sensors are low cost, simple structure, lightweight, fast response time, and high sensitivity. The high sensitivity and fast response time of the electrochemical CO2 sensor is due to the fact that NASICON as solid electrolyte is a fast Na+ ionic conductor. Therefore sensor characteristics strongly depend on NASICON film properties. For fabricate of microstructure electrochemical sensors using semiconductor processes must be crystallized in relatively low temperature region. NASICON have been usually prepared from conventional solid-state reactions at above 1200oC. Butit is difficult to obtain high-purity NASICON in conventional solid-state reaction because be formed of secondary phase such as monoclinic zirconia. In this paper NASICON was synthesized by sol-gel method, and the response signal upon changes of sample gas concentration has been studied for various carbonate auxiliary phases.
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