2020
DOI: 10.3390/nano10020233
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Rapid Microwave Polymerization of Porous Nanocomposites with Piezoresistive Sensing Function

Abstract: In this paper, polydimethylsiloxane (PDMS) and multi-walled carbon nanotube (MWCNT) nanocomposites with piezoresistive sensing function were fabricated using microwave irradiation. The effects of precuring time on the mechanical and electrical properties of nanocomposites were investigated. The increased viscosity and possible nanofiller re-agglomeration during the precuring process caused decreased microwave absorption, resulting in extended curing times, and decreased porosity and electrical conductivity in … Show more

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Cited by 19 publications
(13 citation statements)
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“…The mechanical properties were not significantly affected by the varied loading of CNTs with a relatively consistent compressive modulus of 160 ± 29 kPa between all the sensors. No significant trend was found for the compressive modulus or porosity of each sensor, likely due to significant variations in viscosity between the nanocomposite resins [ 17 ], variations in sugar particle sizes, and potential inhomogeneity during the mixing, resulting in spatial porosity variations in the samples ( Figure S1 ). Representative stress–strain curves for the sponges with varied CNT loadings and consistent sugar porogen loading of 70 wt% are shown in Figure 6 c. The electrical properties were significantly impacted by the nanofiller loading as the measured resistance was an order of magnitude different between CNT loadings of 1.5 wt% and 3 wt%.…”
Section: Resultsmentioning
confidence: 99%
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“…The mechanical properties were not significantly affected by the varied loading of CNTs with a relatively consistent compressive modulus of 160 ± 29 kPa between all the sensors. No significant trend was found for the compressive modulus or porosity of each sensor, likely due to significant variations in viscosity between the nanocomposite resins [ 17 ], variations in sugar particle sizes, and potential inhomogeneity during the mixing, resulting in spatial porosity variations in the samples ( Figure S1 ). Representative stress–strain curves for the sponges with varied CNT loadings and consistent sugar porogen loading of 70 wt% are shown in Figure 6 c. The electrical properties were significantly impacted by the nanofiller loading as the measured resistance was an order of magnitude different between CNT loadings of 1.5 wt% and 3 wt%.…”
Section: Resultsmentioning
confidence: 99%
“…Highly flexible piezoresistive pressure sensors typically decrease their electrical resistance under compressive strain mainly due to movement of conductive nanoparticles forming new conductive networks. Additional mechanisms have been developed and employed to improve the sensitivity of flexible piezoresistive sensors by implementing SiO 2 microparticles to break apart conductive networks [ 15 ], microcracks on a highly conductive surface [ 16 ], and porosity [ 17 ]. Particularly, introducing porosity in flexible sensors has received considerable attention due to facile fabrication methods, enhanced compressibility and sensitivity, and increased commercial applications [ 18 ].…”
Section: Introductionmentioning
confidence: 99%
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“…3 These include Joule or resistive heating, [4][5][6][7] induction heating, 8 vibrational heating, 9 ultrasonic heating and welding, 10 infrared heating, 11 and electromagnetic heating. 12,13 Specically, electromagnetic heating is a rapidly emerging eld that has several advantages including rapid, non-contact, non-invasive, and material-selective volumetric heating.…”
Section: Introductionmentioning
confidence: 99%
“…To satisfy societal demands, various sensors based on the piezoresistive effect [ 1 , 2 , 3 ], capacitive sensing [ 4 , 5 , 6 ], and piezoelectric behavior [ 7 , 8 , 9 ] have been investigated. Triboelectric effect-based sensors have been investigated to develop reliable mechanical and chemical sensors.…”
Section: Introductionmentioning
confidence: 99%