Dai Ming-Zhi, Chen Yen-Ho, Chuang Ming-Yen, Zan Hsiao-Wen, Meng Hsin-Fei
Institute of Physics, National Chiao Tung University, Hsinchu 300, Taiwan.
Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
Sensors (Basel). 2014 Sep 2;14(9):16287-95. doi: 10.3390/s140916287.
In this study, we investigate the keys to obtain a sensitive ammonia sensor with high air stability by using a low-cost polythiophene diode with a vertical channel and a porous top electrode. Poly(3-hexylthiophene) (P3HT) and air-stable poly(5,5'-bis(3-dodecyl-2-thienyl)-2,2'-bithiophene) (PQT-12) are both evaluated as the active sensing layer. Two-dimensional current simulation reveals that the proposed device exhibits numerous connected vertical nanometer junctions (VNJ). Due to the de-doping reaction between ammonia molecules and the bulk current flowing through the vertical channel, both PQT-12 and P3HT VNJ-diodes exhibit detection limits of 50-ppb ammonia. The P3HT VNJ-diode, however, becomes unstable after being stored in air for two days. On the contrary, the PQT-12 VNJ-diode keeps an almost unchanged response to 50-ppb ammonia after being stored in air for 25 days. The improved storage lifetime of an organic-semiconductor-based gas sensor in air is successfully demonstrated.
在本研究中，我们通过使用具有垂直通道和多孔顶部电极的低成本聚噻吩二极管，探究获得具有高空气稳定性的灵敏氨传感器的关键因素。聚（3-己基噻吩）（P3HT）和空气稳定的聚（5,5'-双（3-十二烷基-2-噻吩基）-2,2'-联噻吩）（PQT-12）均被评估为活性传感层。二维电流模拟表明，所提出的器件呈现出众多相连的垂直纳米结（VNJ）。由于氨分子与流经垂直通道的体电流之间的去掺杂反应，PQT-12和P3HT VNJ二极管对氨的检测限均为50 ppb。然而，P3HT VNJ二极管在空气中储存两天后变得不稳定。相反，PQT-12 VNJ二极管在空气中储存25天后，对50 ppb氨的响应几乎保持不变。成功证明了基于有机半导体的气体传感器在空气中的储存寿命得到了改善。
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