Enhanced electrical and thermoelectric power properties of BaWO4/CaWO4 nanocomposites

Patil, Prasad Narayan; Subramanian, Uma; Hyam, Rajeshkumar Shankar

doi:10.1007/s00339-021-04864-4

Cited by 4 publications

(2 citation statements)

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“…In the composites, the dielectric constant increased slowly with an increase in the filler concentration at all frequencies. The resultant improvement in the dielectric constant of composite nanofabrics is caused by the electroactive phase content [55,71], the addition of the filler with a high dielectric constant [48,72], and the charge accumulation at the interface of PVDF and BWN particles in the low-frequency region [73]. At 1 kHz, the highest dielectric constants of 17.64 and 17.68 were observed for the PVDF/BWN-3 and PVDF/BWN-5 composite nanofabrics, respectively.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

“…Barium tungstate (BaWO 4 ) is one of the members of the alkaline earth tungstate family, with a tetragonal scheelite-type structure [47]. BaWO 4 has excellent dielectric property [48], and could act as a nucleating agent by interacting with PVDF chains, which makes it a suitable filler material for uplifting the piezoelectric and triboelectric behavior of PVDF. Therefore, combining electrospinning with addition of nanoscale BaWO 4 to PVDF could possibly enhance the piezoelectric and triboelectric properties of PVDF.…”

Section: Introductionmentioning

confidence: 99%

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Development of a flexible piezoelectric and triboelectric energy harvester with piezo capacitive sensing ability from barium tungstate nanorod-dispersed PVDF nanofabrics

Ekbote

Khalifa

Perumal

et al. 2023

Flex. Print. Electron.

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Lead-free flexible piezoelectric and triboelectric nanogenerators are sought after due to their ability to produce electricity by harnessing wasteful mechanical energy. A comprehensive understanding of additives and processing techniques is crucial for fine-tuning the performance of such energy systems. We have investigated in detail the effect of the addition of reverse microemulsion synthesized barium tungstate nanorods (BWN) on morphology, crystallinity, polymorphism of electrospun nanofabrics of poly(vinylidene fluoride) (PVDF). The electroactive phase content of the nanofabrics was enhanced upon the addition of BWN and the highest electroactive phase content of 86.5% was observed in the nanofabric containing 3 wt% of BWN. The dielectric constant of the nanofabric containing 5 wt% BWN was ~1.96 times higher than that of pristine PVDF nanofabric (EPVDF). The ratio of relative change in the capacitance to initial capacitance of the sensor fabricated from the same system was ~4 times greater than that of EPVDF. Consequently, its piezoelectric and triboelectric performances were improved. The piezoelectric nanogenerator fabricated using the nanofabric containing 3 wt% BWN produced the highest open-circuit voltage of 8 V under an applied load of 8 N. A triboelectric nanogenerator made using the same system was able to produce a voltage output of 200 V, which was 1.77 times as high as that of EPVDF under one-finger tapping in contact-separation mode. The same composite nanofabric produced piezoelectric and triboelectric power densities of 4.3 µW/cm2 and 646 µW/cm2, respectively. The triboelectric nanogenerator was able to light forty LEDs under one finger tapping. Fluttering-driven triboelectric nanogenerator fabricated using the aforementioned nanofabric was able to produce a triboelectric voltage of 84 V at a wind speed of 7 m/s. Overall, these nanofabrics could be a potential material for energy harvesting devices for powering wearable devices, environmental sensors, and internet of things.

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