Printed graphene films with positive temperature coefficient of resistivity

Banerjee, Indrani; Faris, Tsegie; Stoeva, Zlatka; Sharma, Ashwani; Ray, Asim K.

doi:10.1016/j.matpr.2016.11.069

Cited by 3 publications

(3 citation statements)

References 9 publications

(8 reference statements)

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“…Numerically similar negative values of TCRs have been reported for films or buckypapers made of few-layer or multilayer GS layer over alumina 0 to 100 −0.52 Graphene films on SiO 2 25 to 200 0.168 to 0.27 [5] GS ink (in acrylic polymer) on a plastic substrate −5 to 57 0.15 [71] Graphite film over paper 40 to 100 0.12 (c,nl) [66] (c): Calculated (estimated) from published plot or numerical data. (nl): Curve is nonlinear, a linear estimate was carried out.…”

Section: Thermoresistivity Of Carbon Nanotube and Multilayer Graphene...supporting

confidence: 71%

“…Since individual CNTs and single-layer graphene are very difficult to handle, the vast majority of publications dealing with the science and engineering of carbon nanomaterials have used some form of multi-layer graphene films, entangled arrays, bundles, or buckypapers, either free-standing, deposited over a thicker substrate or as an integral part of a multi-layered material. [63,66,[68][69][70][71][72][73][74] The mechanisms governing thermoresistivity in these entangled materials may differ significantly from those of individual CNTs or graphene. This is because in these arrays electrical charge flow occurs through a network, and not only within individual carbon nanostructures.…”

Section: Thermoresistivity Of Carbon Nanotube and Multilayer Graphene...mentioning

confidence: 99%

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Thermoresistivity of Carbon Nanostructures and their Polymeric Nanocomposites

Avilés

2023

Adv Materials Inter

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Carbon nanostructures such as carbon nanotubes, graphene, and its multi‐layer derivatives exhiibit temperature‐dependent electrical conductivity. They can form percolated networks inside polymers, which render electrical conductivity to nanocomposites. Upon the formation of a percolated network, thermal energy applied to the material drives structural changes of the network, which manifest as changes in electrical conductivity. This principle is used to develop smart materials with self‐sensing temperature capabilities. This critical review covers past and present research on the electrical response to temperature (thermoresistivity) of carbon nanostructures and their polymeric nanocomposites. It covers few‐ and multi‐layer graphene, carbon nanotubes, carbon‐nanostructured arrays and fibers (yarns). The mechanisms driving the thermoresistive response of individual nanostructures, their arrays, and of their polymeric nanocomposites are addressed. The role of the nanostructured filler on the thermoresistivity of polymer nanocomposites depends on its morphology and concentration. For low filler concentrations, thermal expansion of the polymer may dominate over the inherent thermoresistivity of the filler. For high filler concentrations, or for densely packed arrays of carbon nanostructures, the inherent (quantum) thermoresistive response of the nanostructures becomes dominant. The review addresses recent progress in the field, highlights current issues, synthesizes published data, and provides outlooks and insights into future directions.

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Section: Thermoresistivity Of Carbon Nanotube and Multilayer Graphene...supporting

confidence: 71%

Section: Thermoresistivity Of Carbon Nanotube and Multilayer Graphene...mentioning

confidence: 99%

Thermoresistivity of Carbon Nanostructures and their Polymeric Nanocomposites

Avilés

2023

Adv Materials Inter

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“…We have recently reported a positive value of ´--1.5 10 K 3 1 for the temperature coefficient of resistance for printed m 0.5 m thick graphene films on flexible plastic substrates, over the temperature range from 260 to 330 K [16]. In light of this preliminary observation, further work has been undertaken to investigate the scope of fabricating low cost graphene thermistors and UV photosensors, using this material.…”

Section: Introductionmentioning

confidence: 93%

Graphene films printable on flexible substrates for sensor applications

et al. 2016

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Fifteen-layered graphene films have been successfully deposited onto flexible substrates using a commercial ink consisting of graphene particles dispersed in an acrylic polymer binder. A value of ´-74.9 10 cm 5 2 was obtained for the density of defects, primarily located at the flake edges, from the ratio of the D and G Raman peaks located at -1345 cm 1 and -1575 cm 1 respectively. m 0.5 m thick drop-cast films on interdigitated silver electrodes exhibited Ohmic conduction with a small activation energy of 12 meV over the temperature range from 260 to 330 K. The photo-thermoelectric effect is believed to be responsible for photoconduction through graphene films under illumination intensity of 10 mW m −2 at 270 nm, corresponding to the UV absorption peak. The photo-transient decay at the bias of 1 V involves two relaxation processes when the illumination is switched off and values of 8.9 10 3 and 4.3 10 s 4 are found for the relaxation time constant using the Kohlrauch stretched exponential function analysis.

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Fabrication of flexible microheater with tunable heating capabilities by direct laser writing and selective electrodeposition

Yang

Han

et al. 2022

Journal of Manufacturing Processes

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Printed graphene films with positive temperature coefficient of resistivity

Cited by 3 publications

References 9 publications

Thermoresistivity of Carbon Nanostructures and their Polymeric Nanocomposites

Thermoresistivity of Carbon Nanostructures and their Polymeric Nanocomposites

Graphene films printable on flexible substrates for sensor applications

Fabrication of flexible microheater with tunable heating capabilities by direct laser writing and selective electrodeposition

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