Piezoresistive effect in epoxy-graphite composites

Serra, Nathalie; Maeder, Thomas; Ryser, Peter

doi:10.1016/j.proeng.2011.12.058

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…The highest values measured for GF are between ~20 and 50 (under pre-stressed conditions) being comparable with other carbon-based strain gauges, e.g. suspended CNT networks (GF ~ 75 ± 5)44, epoxy-graphite composites (GF ~ 10–45)45 and CVD grown diamond films (GF up to ~30)46.…”

Section: Resultssupporting

confidence: 78%

Industrially benign super-compressible piezoresistive carbon foams with predefined wetting properties: from environmental to electrical applications

Pham

Samikannu

Kukkola

et al. 2014

Sci Rep

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In the present work electrically conductive, flexible, lightweight carbon sponge materials derived from open-pore structure melamine foams are studied and explored. Hydrophobic and hydrophilic surface properties - depending on the chosen treatment conditions - allow the separation and storage of liquid chemical compounds. Activation of the carbonaceous structures substantially increases the specific surface area from ~4 m2g−1 to ~345 m2g−1, while retaining the original three-dimensional, open-pore structure suitable for hosting, for example, Ni catalyst nanoparticles. In turn the structure is rendered suitable for hydrogenating acetone to 2-propanol and methyl isobutyl ketone as well for growing hierarchical carbon nanotube structures used as electric double-layer capacitor electrodes with specific capacitance of ~40 F/g. Mechanical stress-strain analysis indicates the materials are super-compressible (>70% volume reduction) and viscoelastic with excellent damping behavior (loss of 0.69 ± 0.07), while piezoresistive measurements show very high gauge factors (from ~20 to 50) over a large range of deformations. The cost-effective, robust and scalable synthesis - in conjunction with their fascinating multifunctional utility - makes the demonstrated carbon foams remarkable competitors with other three-dimensional carbon materials typically based on pyrolyzed biopolymers or on covalently bonded graphene and carbon nanotube frameworks.

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Section: Resultssupporting

confidence: 78%

Industrially benign super-compressible piezoresistive carbon foams with predefined wetting properties: from environmental to electrical applications

Pham

Samikannu

Kukkola

et al. 2014

Sci Rep

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“…Screen-printed thick-film sensors, as previously developed [36][37][38], provide an ideal platform for realizing such an SPE. Hence, the aims of the present work, originated in a preliminary conference paper [39], are to present the steps of the fabrication process and the quality parameters of the obtained sensors.…”

Section: Introductionmentioning

confidence: 99%

Screen-printed electrodes for electroanalytical sensing, of chromium VI in strong acid media

Miscoria

Jacq

Maeder

et al. 2014

Sensors and Actuators B: Chemical

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Highlights• Acid-resistant screen-printed electrodes (SPEs) for Cr(VI) detection were developed.• Carbon-based thick-film SPE pastes were formulated in-house with known composition.• A batch fabrication process allowed simple fabrication of robust sensors.• Cr(VI) at pH 1 was electroanalytically quantified with high sensitivity.• High reproducibility, wide linear range and low detection limit were achieved. AbstractSimple, low-cost and acid-resistant carbon-based screen-printed electrodes (SPEs) addressed to detection of hexavalent chromium species, Cr(VI), in sulfuric acid at pH about 1, were prepared and characterized. Working and counter electrodes were prepared jointly on the same substrate in a single strip (working-counter electrodes pair). The batch printing process allowed obtaining many working-counter electrode pairs in a unique step. The developed working electrodes are comprised of several layers deposited on an alumina substrate: (1) bottom silver conductor, (2) dense organic graphite composite conductor, (3) active layer consisting of a porous organic graphite composite which contains a Cr(III) ionophore for testing Cr(III) obtained after reducing Cr(VI), and (4) an insulating and protective dielectric. All materials except the bottom Ag conductor were made on an organic matrix based on a thermoplastic polymer, polyvinylbutyral (PVB). The amperometric determination of Cr(VI) species at pH 1 was performed over a wide concentration range (dynamic range 3 M 40 mM). The range for linear amperometric response is 3 M 10 mM, with sensitivity about 0.08 mA mM at the electrode surface after the reduction of Cr(VI) when diethylenetriamine-pentaacetic acid (DTPA), a complexing agent for Cr(III) is incorporated into the pastes.

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Piezoresistive effect in epoxy–graphite composites

Serra

Maeder

Ryser

2012

Sensors and Actuators A: Physical

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In this work, we investigate the piezoresistive response of epoxy-graphite composites. A resistive thick-film Wheatstone bridge is deposited by screen-printing onto an alumina beam, a weight is then applied on the tip of the beam and the resulting electrical signal response is recorded, allowing the calculation of the gauge factor. The characterization was made at room temperature, 60°C and 100°C for different matrixes (epoxies with different glass transition temperatures, Tg) and particles sizes (4 µm and 15 µm). The creep of the signal in time and temperature was also observed. The present work shows also the tremendous effect of Tg on piezoresistive behavior: the high Tg epoxy demonstrating better stability in time and temperature than the other one.

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Piezoresistive effect in epoxy-graphite composites

Cited by 3 publications

References 4 publications

Industrially benign super-compressible piezoresistive carbon foams with predefined wetting properties: from environmental to electrical applications

Industrially benign super-compressible piezoresistive carbon foams with predefined wetting properties: from environmental to electrical applications

Screen-printed electrodes for electroanalytical sensing, of chromium VI in strong acid media

Piezoresistive effect in epoxy–graphite composites

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