UV-enhanced room-temperature ultrasensitive NO gas sensor with vertical channel nano-porous organic diodes

被引:42
作者
Madhaiyan, Govindasamy [1 ]
Tung, Ting-Wei [2 ]
Zan, Hsiao-Wen [2 ]
Meng, Hsin-Fei [3 ]
Lu, Chia-Jung [4 ]
Ansari, Arshiya [1 ]
Chuang, Wei-Tsung [5 ]
Lin, Hong-Cheu [1 ,6 ]
机构
[1] Natl Chiao Tung Univ, Dept Mat Sci & Engn, 1001 Ta Hsueh Rd, Hsinchu 300, Taiwan
[2] Natl Chiao Tung Univ, Coll Elect & Comp Engn, Inst Electroopt Engn, Dept Photon, Hsinchu, Taiwan
[3] Natl Chiao Tung Univ, Inst Phys, Hsinchu, Taiwan
[4] Natl Taiwan Normal Univ, Dept Chem, Taipei, Taiwan
[5] Natl Synchrotron Radiat Res Ctr, Hsinchu, Taiwan
[6] Natl Chiao Tung Univ, Ctr Emergent Funct Matter Sci, Hsinchu, Taiwan
关键词
Organic semiconductor; Nitric oxide gas sensor; UV treatment; Photochromic molecules; NITRIC-OXIDE; AMMONIA; LEVEL; PERFORMANCE; IRRADIATION; MODULATION; TRANSPORT; ELECTRODE; POLYMER; ASTHMA;
D O I
10.1016/j.snb.2020.128392
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
In this work, we successfully proposed an organic semiconductor gas sensor on vertical channel design to exhibit an ultra-sensitive response to nitric oxide gas (10 ppb) at room temperature. The effect of ultra-violet (UV) irradiation (lambda =365 nm) on sensing performance of solution processed vertical organic diode (VOD) has been investigated. After implementing a simple and low-cost UV treatment, the sensing response of PBDTTT-C-T based NO sensor is significantly enhanced from 93 % to 233 % at 1 ppm. In addition, we also introduced a new strategy to tune the selectivity of organic gas sensors by using photochromic molecule and organic semiconductor blends. With the 1 Wt% spiropyran dopant, the sensor response to ammonia can be considerably suppressed, hence the response ratio between NO and ammonia can be improved from 2.9 to 16.0, indicating an improved selectivity. The proposed ultrasensitive and selective NO gas sensor have great potential for exhaled breath detection (asthma patients) and environmental monitoring.
引用
收藏
页数:9
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