tailieunhanh - Báo cáo hóa học: " Organic electrochemical transistors based on a dielectrophoretically aligned nanowire array"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Organic electrochemical transistors based on a dielectrophoretically aligned nanowire array | Choi et al. Nanoscale Research Letters 2011 6 339 http content 6 1 339 o Nanoscale Research Letters a SpringerOpen Journal NANO IDEA Open Access Organic electrochemical transistors based on a dielectrophoretically aligned nanowire array WooSeok Choi1 Taechang An1 and Geunbae Lim1 2 Abstract In this study we synthesized an organic electrochemical transistor OECT using dielectrophoresis of a carbon nanotube-Nafion CNT-Nafion suspension. Dielectrophoretically aligned nanowires formed a one-dimensional submicron bundle between triangular electrodes. The CNT-Nafion composite nanowire bundles showed p-type semiconductor characteristics. The drain-source current decreased with increasing gate voltage. The nanowire bundles showed potential as pH sensor because the drain-source current ratio varied linearly according to the gate voltage in pH buffers. Background Recently there has been significant research in the area of organic thin-film transistors OTFTs because of the many benefits of organic semiconductors such as structural flexibility low temperature processing and low cost 1-7 . Organic electrochemical transistors OECTs a subset of OTFTs have been considered as sensors because of their ability to operate in aqueous environments with relatively low voltages and their integration with microfluidics. Furthermore one can to get information on additional dimensions using gate-induced modulation compared with two-terminal devices 5-12 . In particular OECTs formed using one-dimensional nanostructures such as nanotubes and nanowires are more attractive for use as chemical and biological sensors because of their large surface-to-volume ratio light weight and controllable transport properties 10-13 . Recently we have developed a real-time label-free step-wise and target-specific aptasensor for protein molecules using dielectrophoretically aligned singlewalled carbon nanotube SWNT films between patterned cantilever electrodes. We used the SWNT film as a