本論文旨在研究中低溫(500-700℃)型混合電位式NO2氣體感測器，研究重點在於陰極材料Pr0.7Sr0.3BO3 (B=Mn、Co、Cr、Fe)對感測NO2的影響。感測電極以sol-gel法製備奈米級粉末，再網印在YSZ電解質上。電極先藉由XRD、SEM和BET進行分析，再組裝成NO2感測元件進行分析。實驗變數包括:煆燒溫度、感測溫度、O2濃度、電極材料組成、電極濃度和感測氣體的體積流速。
由SEM和BET分析可知，煆燒溫度愈高會使得粒徑愈大且分佈愈不平均。由感測分析可知，Pr0.7Sr0.3MnO3電極感測低濃度NO2時應答電位與NO2濃度成線性，而感測高濃度時應答電位與NO2濃度的對數成線性，且其中以Pr0.7Sr0.3MnO3煆燒1100℃時對NO2之應答電位值最大而應答電位值會隨著O2濃度上升而下降，且與O2濃度之對數成反比；感測溫度上升會提高O2陽極以及NO2陰極反應的觸媒活性而使得應答電位下降；電極材料以Pr0.7Sr0.3CrO3之應答電位值最大，Pr0.7Sr0.3MnO3次之，但回復時間Pr0.7Sr0.3MnO3較快，整體而言，以Pr0.7Sr0.3MnO3之感測表現最好；不同電極濃度中，電極濃度愈稀時應答電位值會愈大；混合電位式氣體感測器之應答電位值會隨感測氣體的體積流速上升而增加。

The main objective of this study is to investigate mixed-potential type NO2 gas sensor for intermediate temperature (500-700℃). The study was focused on the sensing performance of different cathodic materials Pr0.7Sr0.3BO3 ( B = Mn、Co、Cr、Fe ). The sensing electrode was made by sol-gel method to form nano particles. The nano particles were then screen-printed on the YSZ electrolyte. The electrode was analyzed by SEM, BET, XRD and finally tested in the assembled NO2 sesnor. The experimental variables include calcined temperature, sensing temperature, gas concentration and flow rate, electrode concentration.
SEM and BET analyses showed that the particle size increased with increasing calcined temperature, and the particle size was not uniform at higher temperatures. Sensing performance analyses revealed that the sensing response was found to be linearly dependent on the NO2 concentration at lower concentrations and logarithmically dependent at higher concentrations. The response also decreased with increasing O2 concentration on a logarithmic scale. The electrode calcined at 1100℃ gave the highest response. The sensing response decreased with increasing sensing temperature, mainly due to the higher catalytic activities of both O2 anodic and NO2 cathodic reactions. Among all the electrodes investigated, Pr0.7Sr0.3CrO3 has the highest response, followed by Pr0.7Sr0.3MnO3. Nevertheless, the recovery time of Pr0.7Sr0.3MnO3 was faster than that of Pr0.7Sr0.3CrO3. In overall, Pr0.7Sr0.3MnO3 gave better sensing performance. The sensing response was also found to be increased with lower electrode concentration and higher sensing gas flow rate.

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