Modulated gas sensor based on vertical organic diode with blended channel for ppb-regime detection

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• 作者：Ming-Yen Chuang^aAuthor Vitae ; Jian-Nan Chen^bAuthor Vitae ; Hsiao-Wen Zan^a ; ^{hsiaowen@mail.nctu.edu.tw" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Chia-Jung Lu^c ; ^{cjlu@ntnu.edu.tw" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Hsin-Fei Meng^dAuthor Vitae
• 关键词：Gas sensor ; PCBM ; P3HT ; Vertical ; Blended ; Ammonia
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：230
• 期：Complete
• 页码：223-230
• 全文大小：3119 K

文摘

We demonstrate an extremely sensitive ammonia gas sensor based on vertical organic diode to exhibit a 1 ppb detection limit. Using phenyl-C61-butyric acid methyl ester (PCBM) as the sensing layer, the nano-porous structure enlarges the surface to volume ratio and hence realizes the ppb-regime sensitivity. The proposed vertical nano-junction (VNJ) organic diode is then investigated by changing the semiconducting materials (i.e. sensing material). In addition to a pure n-type or p-type sensing material, the blend of n/p organic semiconductor (PCBM/P3HT) is used to react with gas. Changing the n/p blending ratio from 0 to 100% delivers a tunable gas response to ammonia and nitric oxide, hence demonstrating a sensing map concept with good selectivity.