Piezoresistive behavior of graphene nanoplatelets/carbon black/silicone rubber nanocomposite

Cai, Wei; Huang, Ying; Wang, Dayue; Liu, Caixia; Zhang, Yugang

doi:10.1002/app.39778

Cited by 49 publications

(43 citation statements)

References 36 publications

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“…3 Because GNPs has 2-D plane structures and large surface area, the large surface van der Waals force of GNPs particle-particle will result in GNPs reunion. 26 For geometrical considerations, graphene layers are easier to structure in a triangle framework, which established a stable conducting network.…”

Section: B Stability At Constant Temperaturesmentioning

confidence: 99%

Temperature-dependent electrical properties of graphene nanoplatelets film dropped on flexible substrates

et al. 2014

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The fabrication of a temperature sensor based on graphene nanoplatelets (GNPs) is reported. A preheat process was carried out and the micrographs of both original and preheat-treated GNPs are observed and compared. Nonlinear temperature variation of resistance is observed and humidity interference is found to be negligible. Region of 10-60°C (the linear region) is selected as the sensor range and further studied. High sensitivity of GNPs can be seen and the temperature coefficient of resistance (TCR) of 0.0371 is calculated, higher than that of multiwall carbon nanotubes (MWCNTs) and many other materials reported in references. Great repeatability and small hysteresis are obtained. The time constant of the GNPs film is about 5 s, much shorter than that of MWCNTs film. The result suggests that GNPs have potential applications for use in highly sensitive and fast-response temperature sensors.

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Section: B Stability At Constant Temperaturesmentioning

confidence: 99%

Temperature-dependent electrical properties of graphene nanoplatelets film dropped on flexible substrates

et al. 2014

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“…Especially, flexible pressure sensors with high sensitivity in low deformability (strain) are highly desirable for better emulating human skin and more precisely capturing human motions . Piezoresistive‐type sensor, based on the change in the resistance of materials with mechanical deformation, is a promising pressure sensor due to its simple fabrication, low cost, and easy signal collection . Conventionally, flexible and stretchable rubbers filled with conductive carbon such as carbon black, carbon nanotubes, and graphene, are used as sensing materials for piezoresistive sensors.…”

Section: Introductionmentioning

confidence: 99%

Bubble‐Decorated Honeycomb‐Like Graphene Film as Ultrahigh Sensitivity Pressure Sensors

Sheng

Yuan

Jiang

et al. 2015

Adv Funct Materials

195

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6545wileyonlinelibrary.com precisely capturing human motions. [1][2][3] Piezoresistive-type sensor, based on the change in the resistance of materials with mechanical deformation, [ 12,13 ] is a promising pressure sensor due to its simple fabrication, low cost, and easy signal collection. [ 14,15 ] Conventionally, fl exible and stretchable rubbers fi lled with conductive carbon such as carbon black, [ 15 ] carbon nanotubes, [ 16,17 ] and graphene, [ 15 ] are used as sensing materials for piezoresistive sensors. However, these conductive rubber sensors often show poor sensitivity and high operated pressure (>10 kPa), limiting their further application in artifi cial skin. [ 14,18 ] To achieve a high sensitivity in the low-pressure regime (<10 kPa), aligned electrospun nanofi bers in piezoelectric sensors, [ 19 ] microstructured polydimethylsiloxane (PDMS) in capacitive [ 2,18,[20][21][22] and triboelectric sensors, [ 23,24 ] have been employed and developed. However, the high operating voltage for those devices (10-100 V) limits their real applications in wearable devices. [ 25 ] Recently, macroporous graphene monoliths (MGMs), with ultralow density and good electrical conductivity, have aroused considerable recent interest toward pressure sensing due to their excellent elasticity with a rapid rate of recovery. [ 26,27 ] However, MGMs can exhibit better sensitivity when the strain is higher than 30%, which is undesirable for touch-type pressure sensors, [ 14 ] such as artifi cial skin. Thus, it is of great challenge for obtaining pressure sensors with high sensitivity at both low strain and pressure.Here, we demonstrate a novel bubble-decorated honeycomb-like graphene fi lm (BHGF) as fl exible, highly sensitively pressure sensor for monitoring the body motion. Honeycomb-like network and the bubbles are derived from the evaporation of interlayer water and the evolved gases (H 2 O, CO 2 , and CO) trapped in adjacent graphene sheet during the pyrolysis of oxygen groups, respectively. Due to the switching effect depended on "point-to-point" and "point-to-face" contact modes, the BHGF pressure sensor has an ultrahigh sensitivity of 161.6 kPa −1 , several hundred times higher than most previously reported pressure sensors. [ 5,13,14,18,20 ] More importantly, the BHGF sensor exhibits a low operating voltage and good cycling stability at a very low strain less than 4%, demonstrating that it is very suitable for application in artifi cial skin. [ 28 ] Recently, macroporous graphene monoliths (MGMs), with ultralow density and good electrical conductivity, have been considered as excellent pressure sensors due to their excellent elasticity with a rapid rate of recovery. However, MGMs can only exhibit good sensitivity when the strain is higher than 20%, which is undesirable for touch-type pressure sensors, such as artifi cial skin. Here, an innovative method for the fabrication of freestanding fl exible graphene fi lm with bubbles decorated on honeycomb-like network is demonstrated. Due to the switching effect depended on "po...

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“…Many studies have recently demonstrated that polymers especially soft elastomers incorporated with these conducting fillers could show significant piezoresistive performance [8]. A low cost technique was introduced in this study to carry out most of the required measurements in order to characterize the electro-mechanical properties of QTC using both DC and AC applied voltage.…”

Section: Discussionmentioning

confidence: 99%

Automatic Technique for Measuring The Electro-Mechanical Characteristics Of Quantum Tunneling Composites (QTC)

El‐Tonsy¹,

Shaaban²,

O.M.Al-Aqbi³

et al. 2015

IJSEA

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Abstract:Electrically conductive composites consisted of conducting fillers and the insulating polymer matrix. These composites could serve in preparation of piezoresistive composites (i.e. quantum tunnelling composites (QTC) due to their flexibility, light weight, easy processing, low cost, greater resistance changes, and ease of spreading over arbitrary curved surfaces.QTC have attracted tremendous attention due to their potential applications in advanced stress and strain sensors. Recently, various types of conducting materials and many soft polymers have been utilized in the manufacture of QTCs. Characterization of such composites involves several physical parameters. Therefore, a low cost technique was designed and manufactures in order to measure most of electro-mechanical properties of the produced composites with good accuracy and repeatability. QTCs were prepared by mixing poly-dimethyl siloxane (PDMS) and with different concentrations of graphite flakes (1:0.75, 1:1, 1:1.5, 1:1.75 and 1:2). This study declared the efficiency of the suggested technique as well as some fundamental features of the prepared composite. For example, conductivity of the composites containing higher concentration of graphite was found to be independent on rate of pressing during the test. It was also found that the capacitive behavior of the sample interrupted the flow of current at the instant of removing the applied pressure. The suggested setup has several advantages such as simplicity, high accuracy and providing lots of technical data that required for development and confirmation of models for the quantum tunnelling process.

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Piezoresistive behavior of graphene nanoplatelets/carbon black/silicone rubber nanocomposite

Cited by 49 publications

References 36 publications

Temperature-dependent electrical properties of graphene nanoplatelets film dropped on flexible substrates

Temperature-dependent electrical properties of graphene nanoplatelets film dropped on flexible substrates

Bubble‐Decorated Honeycomb‐Like Graphene Film as Ultrahigh Sensitivity Pressure Sensors

Automatic Technique for Measuring The Electro-Mechanical Characteristics Of Quantum Tunneling Composites (QTC)

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