The tunable sensing behaviors of flexible conductive PDMS/NCG composites via regulation of filler size prepared by a facile sedimentation method

Li, Siqi; Liu, Qian; Sun, Zhijian; Liu, Qing‐Yan; Lv, An; Hu, Zikang; Xu, YaTing; Wan, Shasha; Hu, Hailong; Liu, Zhuohang; Fu, Xudong; Liu, Qingting; Hu, Songqing; Zhang, Rong; Wong, C.P.

doi:10.1016/j.compscitech.2021.109037

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…[22] Reported strain sensing of a silver carbon composite screen printed strain gauge on TPU by applying different loads on the sensor to observe the resistance changes. [28] Studied the sensing behaviour of flexible conductive PDMS/NCG nickel coated graphite composite fabricated by natural sedimentation method. The author reported resistance of the sensors were increased and then decreased when the sensor was under twisting, stretching and bending mode.…”

Section: Introductionmentioning

confidence: 99%

“…The author reported resistance of the sensors were increased and then decreased when the sensor was under twisting, stretching and bending mode. [26]- [28] used bending property for applying mechanical strain to the sensor which were used mostly in human motion detection and soft robotics. Another method to give strain to the sensor is stretching, in which force is applied in the opposite direction on the sensor.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and characterization of Screen-printed Graphite and Nickel Based Thick Film Resistive Strain Sensor

Saujanya,

Poornaiah,

Kumari

et al. 2024

International Journal of Chemical Engineering and Materials

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Piezo resistive properties of thick film resistors are shown by a variety of nanomaterials, in which graphite and nickel are used to study the piezo resistive response in this paper. The present work proposes to fabricate stain sensor on substrates like PVC, and transparent plastic sheet. Screen printing method is used for patterning of sensor on the substrates with two different inks namely piezo resistive ink made of graphite and nickel powder and conductive ink made of silver. Change in resistance of the fabricated sensor is noted for the changes in force applied on the sensor and corresponding gauge factor is observed to be around 10.5 and 11 for PVC and OHP respectively. The screen-printed strain gauge performance is investigated and presented in this paper. This study of mechanical test results demonstrate that the sensor can be used for micro strain detection in various applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of Screen-printed Graphite and Nickel Based Thick Film Resistive Strain Sensor

Saujanya,

Poornaiah,

Kumari

et al. 2024

International Journal of Chemical Engineering and Materials

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“…Nickel-plated graphite (NCG) is a new low-cost conductive filler that combines the excellent electrical conductivity and electromagnetic shielding properties of nickel with the good self-lubricating properties of graphite, 16 however, the high density of NCG with micron-level filler tends to settle and agglomerate in the resin matrix, which is not conducive to the formation of conduction paths and limits the electrical conductivity of its composites. Zhang et al 17,18 prepared flexible conductive polydimethylsiloxane/NCG composites by the modulated settling method and one-step settling method using its settling properties. Boumedienne et al 19 placed molded samples on rotating rollers in a 100 C oven for 1 h in order to prevent the dense metal particles in the epoxy matrix from settling during polymerization, and the rotation of the curing process facilitated a more even distribution of the filler in all directions of the composite.…”

Section: Introductionmentioning

confidence: 99%

Effect of N–Ni coordination bond on the electrical and thermal conductivity of epoxy resin/nickel‐coated graphite

Zhang,

et al. 2023

J of Applied Polymer Sci

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The agglomeration of nickel‐coated graphite (NCG) in epoxy resin (EP) composites leads to low electrical conductivity of EP composites, which limits their development in electronic devices and multilayer circuits. In order to improve the electrical and thermal conductivity of NCG/EP composites, ethylenediamine (EDA) was used to modify NCG and compared with pure NCG‐filled EP composites. It was found that the conductive effect of modified composites with 20 wt% filler is better than that of unmodified composites with 40 wt% filler. The results of Fourier transform infrared spectroscopy and thermogravimetric analysis of EDA‐modified NCG (ENCG) showed that a coordination adsorption reaction occurred between EDA and NCG, forming N–Ni coordination bonds. When the filling amount of ENCG was 40 wt%, the conductivity and thermal conductivity of the composite are improved most significantly. The volume resistivity was reduced from 2.636 to 0.109 Ω cm, a decrease of 95.85%, and the thermal conductivity was improved from 0.517 to 0.968 W/(m K), an increase of 87.23%, respectively. Meanwhile, ENCG has better dispersion in the EP matrix than NCG.

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Segregated and Non‐Settling Liquid Metal Elastomer via Jamming of Elastomeric Particles

Xue

Zhang

et al. 2022

Adv Funct Materials

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Liquid metal elastomer (LME)-that is, liquid metal particles dispersed in elastomer-is a soft material that has useful electric, dielectric, and thermal properties. Two issues with LME are sought to be addressed: 1) the dense liquid metal (LM) particles can settle before curing of the elastomer, and 2) the LM particles are separated by a thin layer of insulating elastomer and therefore require some "mechanical sintering" to break this layer to create conductive paths. These issues are addressed using an LME containing elastic particles (LMEP). Elastic polydimethylsiloxane particles (PPs) and LM particles jam to prevent particle settling. Meanwhile, the PPs reduce the loading necessary to create conductive paths, thus decreasing the density and cost relative to LME. Surprisingly, the particles percolate into conductive paths prior to curing the LMEP but not in LME. The dielectric constant, electrical conductivity, and thermal conductivity of LMEPs are investigated by changing the volume fraction of LM particles, polydimethylsiloxane prepolymer and PPs, and propose an LMEP with the optimal ratio. In addition, LMEP-based sensors and circuits are demonstrated for wearable electronics.

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The tunable sensing behaviors of flexible conductive PDMS/NCG composites via regulation of filler size prepared by a facile sedimentation method

Cited by 7 publications

References 21 publications

Fabrication and characterization of Screen-printed Graphite and Nickel Based Thick Film Resistive Strain Sensor

Fabrication and characterization of Screen-printed Graphite and Nickel Based Thick Film Resistive Strain Sensor

Effect of N–Ni coordination bond on the electrical and thermal conductivity of epoxy resin/nickel‐coated graphite

Segregated and Non‐Settling Liquid Metal Elastomer via Jamming of Elastomeric Particles

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