期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 26, 页码 22504-22512出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b06458
关键词
helical structure; nanofibrils; morphology control; ammonia sensor; organic field-effect transistor; phase separation
资金
- National Natural Science Foundation of China (NSFC) [51703047, 51573036, 51673058]
- Distinguished Youth Foundation of Anhui Province [1808085J03]
- Fundamental Research Funds for the Central Universities [JZ2018HGPB0276, JZ2017HGBZ0919, JZ2017HGBH0952]
Conjugated polymers with a helical structure have been in rapid development in recent years because of their potential applications in chemical and biological sensors. We demonstrate the fabrication and characterization of helical nanofibrils of block copolymer poly(4-iso-cyano-benzoic acid 5-(2-dimethylamino-ethoxy)-2-nitro-benzylester)-b-poly(3-hexylthiophene) (PPI(-DMAENBA)-b-P3HT) via a transferetching method. The density and lateral length of nanofibrils can be facilely controlled by regulating the process conditions, which, in turn, directly determine the electronic property. Organic field effect transistors based on helical nanofibrils were successfully fabricated with the highest mobility of 9.1 X 10(-3) cm(2)/(V s)(-1), an on/off ratio of 3.4 X 10(5), and high bias stability. The helical nanofibrils were proved to be beneficial for obtaining a highly sensitive and selective chemical sensor. And, the transistor based on helical nanofibrils exhibits a relative response of 28.6% to 100 ppb ammonia, which is even much higher than the responses to 1 ppm ammonia for homo poly(3-hexylthiophene) nanofibrils (7%) and block copolymer nanofibrils without helical structure (0.9%). The combination of helical structure with nanofibrils may provide a new strategy to fabricate high-performance chemical sensors suitable for use in environmental monitoring, industrial and agricultural production, health care, and foodsafety.
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