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작성일 : 17-06-13 13:59
JMC-C Front Cover_PVDF-activated carbon composite
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   TC005020_OFC_PUBLICITY.pdf (11.1M) [9] DATE : 2017-06-13 13:59:53
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J. Mater. Chem. C, 2017, 5, 4833_Front Cover Figure
 Enhanced electroactive b-phase of the sonication-process-derived PVDF-activated carbon composite film for efficient energy
conversion and a battery-free acceleration sensor

  Nagamalleswara Rao Alluri, a Arunkumar Chandrasekhar, b Ji Hyun Jeonga and Sang-Jae Kim *b

A flexible, lightweight, and highly efficient poly(vinylidene fluoride)-activated carbon (C-PVDF-AC)
composite film in 30 V/V% concentration was derived using the sonication process, followed by heat
treatment, and studied for unconventional energy conversion and active sensing purposes (without
battery energy). The use of the sonication process originates the high electroactive b-phase of PVDF
without the requirement for an additional electrical poling process. The substitution of AC fillers in PVDF
stabilized and improved the electroactive b-phase of PVDF and also acted as electrical conduction paths
between –CH2–/–CF2– electric dipoles of PVDF. The frequency-dependent dielectric constant and
electrical conductivity of the sonication-process-derived PVDF and composite films showed a better
response, which was due to the improvement in the electric dipole–dipole interactions and interfacial
interactions between the AC fillers and PVDF molecular chains. An unpoled PVDF nanogenerator (P-NG)
and composite nanogenerator (C-NG) generated high peak-to-peak VOC and ISC values of 37.77 V and
299 nA and 37.87 V and 0.831 mA, respectively, under 6.6 kPa pressure. No electrical poling effect was
observed in P-NG output, whereas C-NG (30 V/V%)’s output showed a significant voltage increment
(E30%) and current increment (E96%). The obtained instantaneous power density E63.07 mW m2 of
C-NG was sufficient to drive low-power electronic devices such as LEDs and displays. It was experimentally
verified that the C-NG device itself can act as a self-powered acceleration sensor (SAS) and the output voltage
showed a linear behavior between the input accelerations from 0.5 to 5 m s2 and the shaft load.