本論文旨在研究鈣鈦礦結構氧化物陰極材料應用於二氧化氮感測器的特性，使用的材料分別為Pr0.7Sr0.3CrO3-δ、Pr0.7Sr0.3FeO3-δ以及Pr0.7Sr0.3CoO3-δ。電極粉末是使用溶膠凝膠法製備而得。利用檸檬酸鹽前導化合物經煅燒，混合有機溶劑成為網印膠，再將網印膠以網印法塗布到YSZ電解質錠片上燒結，完成後得到所需要之感測電極，而此電極以XRD、FE-SEM等設備來進行分析，最後再組裝成感測器進行二氧化氮氣體感測。
XRD分析結果顯示，所選用的三種材料皆為鈣鈦礦結構。而FE-SEM圖片顯示煅燒溫度越高的粉末其平均粒徑越大；網印膠濃度越稀薄，製備完成後的電極厚度越薄。從NO2感測特性結果可知，應答電位最大的電極材料為Pr0.7Sr0.3CrO3-δ，而其最佳煅燒溫度為1200℃，最佳電極的厚度條件是以1：5粉末溶劑比所燒結的電極，其應答電位差最大且回復時間最短。操作電流以施加1µA有最小的應答電位差但是卻有最短的回復時間。

The main purpose of this study is to investigate the characteristics of perovskite oxide used as cathode for NO2 sensor. Three kinds of perovskite-type oxides were used including Pr0.7Sr0.3CrO3-δ, Pr0.7Sr0.3FeO3-δ and Pr0.7Sr0.3CoO3-δ. The electrodes were prepared by sol-gel method. The sensing electrode was made by mixing the calcined precursor with organic solvent.
The slurry thus obtained was then printed on YSZ pellets by screen-printing method and sintered to form sensing electrodes. The electrodes were characterized by XRD and FE-SEM, and finally tested in the assembled NO2 sensors.
From XRD patterns, all the prepared oxide powers were found to be perovskite type. FE-SEM photos show that the average particle size was increased with increasing calcined temperature. A thinner sensing electrode was obtained by using dilute slurry.
NO2 sensing analysis shows that Pr0.7Sr0.3CrO3-δ was found to be the best oxide power for NO2 sensing electrode. The optimal calcined temperature is 1200℃. The better slurry concentration for the sensing electrode was found to be 1:5 wt. ratio of oxide powder to organic solvent. Such prepared sensing electrode presents larger voltage change and shorter recovery time. The best current bias for the sensing system was 1µA.

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