期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 117, 期 22, 页码 11791-11799出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp4011026
关键词
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资金
- National Research Foundation of Korea (NRF) [RIAM 041-2004-I-D00224, RIAM NR03-09 (0417-20090027)]
- National Research Foundation of Korea (NRF) (ITSTD Program RIAM AC) [041720096070]
- National Research Foundation of Korea (NRF) (SRC/ERC program) [R11-2005-065]
- Ministry of Knowledge Econonics [RIAM I-AC14-10 (0417-20100043)]
- NRF [NRF-2009-0080253]
- National Research Council of Science & Technology (NST), Republic of Korea [KK-1390-D0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2009-0076451, 2005-0049405] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We prepared poly(vinylidene fluoride) (PVDF)/multiwalled carbon nanotube (MWCNT) nanocomposites using the electrospinning process and investigated the effects of varying the MWCNT content, as well as the additional use of drawing and poling on the polymorphic behavior and electroactive (piezoelectric) properties of the membranes obtained. Fourier transform infrared spectroscopy and wide-angle X-ray diffraction revealed that dramatic changes occurred in the beta-phase crystal formation with the MWCNT loading. This was attributed to the nucleation effects of the MWCNTs as well as the intense stretching of the PVDF jets in the electrospinning process. The remanent polarization and piezoelectric response increased with the amount of MWCNTs and piezoelectric beta-phase crystals. A further mechanical stretching and electric poling process induced not only highly oriented beta-phase crystallites, but also very good ferroelectric and piezoelectric performances. In the drawn samples, the interfacial interaction between the functional groups on the MWCNTs and the CF2 dipole of PVDF chains produced a large amount of beta-phase content. In the poled samples, the incorporation of the MWCNTs made it easy to obtain efficient charge accumulation in the PVDF matrix, resulting in the conversion of the alpha-phase into the beta-phase as well as the enhancement of remanent polarization and mechanical displacement.
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