Carbon fiber doped thermosetting elastomer for flexible sensors: physical properties and microfabrication

Khosla, Ajit; Shah, Shreyas; Shiblee, Nahin Islam; Mir, Sajjad Husain; Nagahara, Larry A.; Thundat, Thomas; Shekar, Praveen Kumar; Kawakami, Masaru; Furukawa, Hidemitsu

doi:10.1038/s41598-018-30846-3

Cited by 51 publications

(40 citation statements)

References 45 publications

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“…The resulting three-dimensional porous nanocomposites, with the CNFs embedded in the PDMS pore walls, exhibit a greatly increased failure strain (up to ∼94%) compared to that of the solid, neat PDMS (∼48%) [23]. More related research on flexible PDMS can be found in References [24,25,26,27,28].…”

Section: Introductionmentioning

confidence: 99%

Mechanically Enhanced Electrical Conductivity of Polydimethylsiloxane-Based Composites by a Hot Embossing Process

Gao

Huang

et al. 2019

Polymers

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Electrically conductive polymer composites are in high demand for modern technologies, however, the intrinsic brittleness of conducting conjugated polymers and the moderate electrical conductivity of engineering polymer/carbon composites have highly constrained their applications. In this work, super high electrical conductive polymer composites were produced by a novel hot embossing design. The polydimethylsiloxane (PDMS) composites containing short carbon fiber (SCF) exhibited an electrical percolation threshold at 0.45 wt % and reached a saturated electrical conductivity of 49 S/m at 8 wt % of SCF. When reducing the sample thickness from 1.0 to 0.1 mm by the hot embossing process, a compression-induced percolation threshold occurred at 0.3 wt %, while the electrical conductivity was further enhanced to 378 S/m at 8 wt % SCF. Furthermore, the addition of a second nanofiller of 1 wt %, such as carbon nanotube or conducting carbon black, further increased the electrical conductivity of the PDMS/SCF (8 wt %) composites to 909 S/m and 657 S/m, respectively. The synergy of the densified conducting filler network by the mechanical compression and the hierarchical micro-/nano-scale filler approach has realized super high electrically conductive, yet mechanically flexible, polymer composites for modern flexible electronics applications.

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Section: Introductionmentioning

confidence: 99%

Mechanically Enhanced Electrical Conductivity of Polydimethylsiloxane-Based Composites by a Hot Embossing Process

Gao

Huang

et al. 2019

Polymers

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“…Carbon‐doped inorganic or polymer composite materials have attracted much attention. Different forms of carbon (ie, graphite, diamond, fullerenes, and other all‐carbon polymeric allotropies) can provide composite materials plenty of new functionalities in electronics, optics, and mechanics 1‐3 . Embedding carbon nanostructures into transparent glass is of particular interest for optical studies 3‐5 .…”

Section: Introductionmentioning

confidence: 99%

“…Different forms of carbon (ie, graphite, diamond, fullerenes, and other all-carbon polymeric allotropies) can provide composite materials plenty of new functionalities in electronics, optics, and mechanics. [1][2][3] Embedding carbon nanostructures into transparent glass is of particular interest for optical studies. [3][4][5] The absorptive and emissive properties of carbon nanostructures can be used in devices such as attenuators, saturable absorbers, light-emitting diodes, etc.…”

Section: Introductionmentioning

confidence: 99%

Carbon‐doped fused silica glass

Zhang

Rezikyan

Liu

et al. 2020

Int J of Appl Glass Sci

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Carbon‐doped fused silica glass is fabricated by consolidating zinc stearate‐doped porous silica soot blank. The carbon doping concentration is tunable and a maximum of ~0.3 wt% carbon can be incorporated into densified silica. Carbon dopants assemble into nanorod structures which are uniformly distributed inside glass. Transmission electron microscopy electron energy loss spectroscopy and Raman studies identify that carbon dopants are a mixture of nanosized silicon carbide and multiple layer graphene, which produce strong and flat optical absorption in a wide wavelength range of 400‐2500 nm. The electrical resistivity of silica glass is reduced by about 15 orders of magnitude with 0.28 wt% carbon doping.

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“…With the high demand for ultra-sensitive biodetectors, beam-based micro and nanosystems have emerged and developed recently 11–15 . Their fabrication has also attracted much attention due to its difficulties in the ultra-small scale to reach acceptable accuracy in the instrumentation engineering 2,16 . Recently, it has been reported that fabricating nanobridges from the silicon crystal walls of 30 nm thickness is possible by the application of focused ion beam (FIB) and scanning electron microscopy (SEM) based techniques 17 .…”

Section: Introductionmentioning

confidence: 99%

A thermosensitive electromechanical model for detecting biological particles

SoltanRezaee

Bodaghi

Farrokhabadi

2019

Sci Rep

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Miniature electromechanical systems form a class of bioMEMS that can provide appropriate sensitivity. In this research, a thermo-electro-mechanical model is presented to detect biological particles in the microscale. Identification in the model is based on analyzing pull-in instability parameters and frequency shifts. Here, governing equations are derived via the extended Hamilton’s principle. The coupled effects of system parameters such as surface layer energy, electric field correction, and material properties are incorporated in this thermosensitive model. Afterward, the accuracy of the present model and obtained results are validated with experimental, analytical, and numerical data for several cases. Performing a parametric study reveals that mechanical properties of biosensors can significantly affect the detection sensitivity of actuated ultra-small detectors and should be taken into account. Furthermore, it is shown that the number or dimension of deposited particles on the sensing zone can be estimated by investigating the changes in the threshold voltage, electrode deflection, and frequency shifts. The present analysis is likely to provide pertinent guidelines to design thermal switches and miniature detectors with the desired performance. The developed biosensor is more appropriate to detect and characterize viruses in samples with different temperatures.

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Carbon fiber doped thermosetting elastomer for flexible sensors: physical properties and microfabrication

Cited by 51 publications

References 45 publications

Mechanically Enhanced Electrical Conductivity of Polydimethylsiloxane-Based Composites by a Hot Embossing Process

Mechanically Enhanced Electrical Conductivity of Polydimethylsiloxane-Based Composites by a Hot Embossing Process

Carbon‐doped fused silica glass

A thermosensitive electromechanical model for detecting biological particles

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