Manipulation on the Morphology and Electrical Properties of Aligned Electrospun Nanofibers of Poly(3-hexylthiophene) for Field-Effect Transistor Applications

被引:107
作者
Chen, Jung-Yao [1 ]
Kuo, Chi-Ching [2 ]
Lai, Chia-Sheng [3 ]
Chen, Wen-Chang [1 ,2 ]
Chen, Hsin-Lung [3 ]
机构
[1] Natl Taiwan Univ, Dept Chem Engn, Taipei 10764, Taiwan
[2] Natl Taiwan Univ, Inst Polymer Sci & Engn, Taipei 10764, Taiwan
[3] Natl Tsing Hua Univ, Dept Chem Engn, Hsinchu, Taiwan
关键词
CONJUGATED POLYMERS; PHOTOPHYSICAL PROPERTIES; MOLECULAR-WEIGHT; EFFECT MOBILITY; FIBERS; TRANSPORT; BLENDS;
D O I
10.1021/ma102286m
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
We prepared aligned poly(3-hexylthiophene) (P3HT) nanofibers for the application of organic field-effect transistor (OFET) by two-fluid coaxial electrospinning (ES) technique using P3HT as Core and PMMA as shell, followed by extraction of PMMA. Effects Of shell flow rate and thermal annealing temperature on the morphology and optoelectronic properties were explored. The experimental results show that the prepared P3HT nanofibers were highly aligned and their diameters were Smaller in the case of low shell flow rate. The OFET carrier mobility of aligned P3HT ES nanofibers using the low shell flow rate could be dramatically improved up to 3 orders of magnitude (1.92 x 10(-1) cm(2)/V.s with the on/off ratio of 4.45 x 10(4)) in comparison with those from the high shell flow rate. The results of wide-angle X-ray scattering (WAXS) and photophysical properties (optical absorption and polarized photoluminescence) suggested the enhancement of pi-pi stacking and crystallinity of P3HT in the nanofibers at a lower Shell flow rate due to the higher electrical force along nanofiber axis. Besides, as thermal annealing was higher than 100 degrees C, the relaxation of P3HT orientation in the nanofibers led to a reduction of measured field-effect. mobility. The experimental, results addressed the importance of the process parameters (i.e., the shell flow:rate the chain packing and orientation of P3HT in nanofibers and the resultant OFET and thermal annealing temperature on tuning characteristics.
引用
收藏
页码:2883 / 2892
页数:10
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