期刊
ACS APPLIED POLYMER MATERIALS
卷 4, 期 1, 页码 635-644出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.1c01549
关键词
piezoelectric; nanofiber; polyacrylonitrile; electrospinning; flexible
资金
- Creative Materials Discovery Program through the National Research Foundation of Korea - Ministry of Sc ience and ICT [2018M3D1A1057844]
This study systematically investigated the size- and conformation-dependent piezoelectric properties of polyacrylonitrile (PAN) nanofibers. It was found that the electrospinning process and post-thermal treatment could increase the proportion of the electroactive phase in the nanofibers, leading to a higher piezoelectric charge constant.
While high-performance piezoelectric polymeric nanofibers such as polyvinylidene fluoride and its derivatives have been extensively studied to various applications, limited works examined other functional piezoelectric organic polymers with different chemical functionalities. In this work, size- and conformation-dependent piezoelectric properties of polyacrylonitrile (PAN) nanofibers were systematically investigated. PAN nanofibers with diameters ranging from 40 to 600 nm were systematically synthesized by adjusting electrospinning solution conditions where their conformation was further tuned through post-thermal treatment. Through in situ poling and stretching of polymer chains, the electrospinning process allowed the alignment of polar functional groups along the nanofibers to form a greater fraction of the electroactive phase (i.e., zigzag) over 3(1) helical (nonelectroactive) conformation. Smaller fiber further increased the electroactive content by the dimensional confinement effect. Fouriertransform infrared spectroscopy analysis and X-ray diffraction analysis confirmed the enhancement of zigzag conformation over 3(1) helical by reducing the fiber diameter and postannealing. A piezoelectric charge constant of 39.0 pm/V was achieved via reducing the PAN nanofiber diameter down to 40 nm, followed by post-thermal treatment at 95 degrees C, which paved a way to develop a flexible high-performance nanogenerator with diverse chemical functionality.
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