Pressure Sensing and Electronic Amplification with Functionalized Graphite–Silicone Composite

Littlejohn, Samuel David; Nogaret, Alain; Prentice, Giles M.; Pantoş, G. Dan

doi:10.1002/adfm.201300519

Cited by 23 publications

(36 citation statements)

References 25 publications

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“…[38][39][40][41][42] The fl exibility of graphene renders it suitable for a wide range of fl exible electronic devices, including transistors, solar cells, sensors, batteries, and supercapacitors. [43][44][45][46] Meanwhile, the outstanding mechanical and electrical properties of graphene [47][48][49][50][51][52][53][54][55] enable it to convert physical contacts into electric signals, thus allowing it to be utilized in high-performance fl exible tactile sensors. [ 26,32,37,56 ] Also, the performance of tactile sensors can be improved through the introduction of regular 3-D microstructures.…”

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confidence: 99%

Microstructured Graphene Arrays for Highly Sensitive Flexible Tactile Sensors

Zhu

Niu

Wang

et al. 2014

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A highly sensitive tactile sensor is devised by applying microstructured graphene arrays as sensitive layers. The combination of graphene and anisotropic microstructures endows this sensor with an ultra-high sensitivity of -5.53 kPa(-1) , an ultra-fast response time of only 0.2 ms, as well as good reliability, rendering it promising for the application of tactile sensing in artificial skin and human-machine interface.

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confidence: 99%

Microstructured Graphene Arrays for Highly Sensitive Flexible Tactile Sensors

Zhu

Niu

Wang

et al. 2014

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“…48 The combination of NDIs and siloxanes in discrete systems has already been investigated by others, 49−51 but none of these studies pushed the boundaries of molecular definition to an intermediate regime between small molecules and polymeric systems. The fully extended chemical structures of monodisperse Si15-NDI 2 -Si15 and NDI 2 -Si16-NDI 2 are shown in Chart 1 as examples.…”

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confidence: 99%

Unraveling the Driving Forces in the Self-Assembly of Monodisperse Naphthalenediimide-Oligodimethylsiloxane Block Molecules

et al. 2017

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Block molecules belong to a rapidly growing research field in materials chemistry in which discrete macromolecular architectures bridge the gap between block copolymers (BCP) and liquid crystals (LCs). The merging of characteristics from both BCP and LCs is expected to result in exciting breakthroughs, such as the discovery of unexpected morphologies or significant shrinking of domain spacings in materials that possess the high definition of organic molecules and the processability of polymers. Here we report the bulk self-assembly of two families of monodisperse block molecules comprised of naphthalenediimides (NDIs) and oligodimethylsiloxanes (ODMS). These materials are characterized by waxy texture, strong long-range order, and very low mobility, typical properties of conformationally disordered crystals. Our investigation unambiguously reveals that thermodynamic immiscibility and crystallization direct the self-assembly of ODMS-based block molecules. We show that a synergy of high incompatibility between the blocks and crystallization of the NDIs causes nanophase separation, giving access to hexagonally packed columnar (Colh) and lamellar (LAM) morphologies with sub-10 nm periodicities. The domain spacings can be tuned by mixing molecules with different ODMS lengths and the same number of NDIs, introducing an additional layer of control. X-ray scattering experiments reveal macrophase separation whenever this constitutional bias is not observed. Finally, we highlight our “ingredient approach” to obtain perfect order in sub-10 nm structured materials with a simple strategy built on a crystalline “hard” moiety and an incompatible “soft” ODMS partner. Following this simple rule, our recipe can be extended to a number of systems.

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“…Composites of graphitic nanoparticles in polymethylsiloxane (silicone) have also attracted attention for their robust NDR which has been put to work in actual flexible devices such as electronic amplifiers and pressure sensors . Silicone is flexible but insulating.…”

Section: Materials For Ndrmentioning

confidence: 99%

“…We show how NDR devices achieve the traditional functions of transistors such as voltage amplification, bistable memories and are unique in implementing multilevel logic, and high frequency generation . The recent demonstration of NDR in flexible materials opens an exciting new direction for fundamental research on the coupling between mechanical deformation and electronic gain, which opens a range of new possibilities for electromechanical sensing …”

Section: Introductionmentioning

confidence: 96%

Negative differential conductance materials for flexible electronics

Nogaret

2013

J of Applied Polymer Sci

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The need for electronics that is compatible with life is driving the search for electronically active materials that may be used for transferring integrated circuits onto flexible substrates. One route is to build transistors, which modulate the conductivity of organic thin films with a lateral gate. However, as is well known in the case of graphene, the in‐plane conductivity cannot easily be switched off. Another route is to use negative differential resistance (NDR) phenomena. Until recently, NDR was only obtained from band engineered semiconductors. This article reviews the recent development of flexible materials that specifically make use of transport perpendicular to graphite planes to obtain NDR. These materials include h‐boron‐nitride/graphene multilayers and graphite‐silicone composites. We report on the dependence of their current‐voltage curves on deformation, changes in structural and experimental parameters. We also describe device implementations in the form of flexible oscillators, amplifiers and memories. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40169.

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Pressure Sensing and Electronic Amplification with Functionalized Graphite–Silicone Composite

Cited by 23 publications

References 25 publications

Microstructured Graphene Arrays for Highly Sensitive Flexible Tactile Sensors

Microstructured Graphene Arrays for Highly Sensitive Flexible Tactile Sensors

Unraveling the Driving Forces in the Self-Assembly of Monodisperse Naphthalenediimide-Oligodimethylsiloxane Block Molecules

Negative differential conductance materials for flexible electronics

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