Conductive and superhydrophobic F-rGO@CNTs/chitosan aerogel for piezoresistive pressure sensor

Wu, Jingjing; Li, Hongqiang; Lai, Xuejun; Chen, Zhonghua

doi:10.1016/j.cej.2019.123998

Cited by 164 publications

(71 citation statements)

References 55 publications

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“…Chitosan (CS) is the deacetylated product of chitin that is derived from shrimp and crab shell. It can be used in the applications of drug delivery [ 12 ], wound dressing [ 13 ], food packaging [ 14 ], piezoresistive pressure sensor [ 15 ], and wastewater treatment [ 16 , 17 ]. CS/carboxymethyl cellulose/graphene oxide hybrid aerogel was fabricated and could be applied in pH-controlled drug delivery applications [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…Hydrophobic modified CS aerogels have also been studied by many researchers. A conductive and superhydrophobic high-performance piezoresistive pressure sensor based on 1H,1H,2H,2H-perfluorooctyltriethoxysilane (FAS) modified reduced graphene oxide@carbon nanotubes/CS aerogel was successfully fabricated [ 15 ]. A stable GO/CS aerogel processed and exhibited high methylene blue adsorption capacity [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

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Sustainable, Highly Efficient and Superhydrophobic Fluorinated Silica Functionalized Chitosan Aerogel for Gravity-Driven Oil/Water Separation

Zhu

Jiang

Liu

et al. 2021

Gels

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A superhydrophobic fluorinated silica functionalized chitosan (F-CS) aerogel is constructed and fabricated by a simple and sustainable method in this study in order to achieve highly efficient gravity-driven oil/water separation performance. The fluorinated silica functionalization invests the pristine hydrophilic chitosan (CS) aerogel with promising superhydrophobicity with a water contact angle of 151.9°. This novel F-CS aerogel possesses three-dimensional structure with high porosity as well as good chemical stability and mechanical compression property. Moreover, it also shows striking self-cleaning performance and great oil adsorption capacity. Most importantly, the as-prepared aerogels exhibits fast and efficient separation of oil/water mixture by the gravity driven process with high separation efficiency. These great performances render the prepared F-CS aerogel a good candidate for oil/water separation in practical industrial application.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sustainable, Highly Efficient and Superhydrophobic Fluorinated Silica Functionalized Chitosan Aerogel for Gravity-Driven Oil/Water Separation

Zhu

Jiang

Liu

et al. 2021

Gels

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“…This result indicates that our experiment is consistent with our previous research (the atomic ratios of C1s/O1s increase from 2.99 to 4.15 after chemical reduction) and other groups' research. [37,40] As shown in Figure 3e,f, the C1s spectrums of these two samples contained 5 peaks locating at 284.6 eV (CC/CC), 286.6 eV (CO), 288.0 eV (CO), 289.2 eV (OCO), and 285.5 eV (CN), respectively. Compared with the GO/TPU foam, the intensity of the CC/CC peak for the rGO/TPU foam significantly increased, whereas the intensities of those from oxygen-containing groups (CO, CO, OCO) plummet, thereby verifying the effectiveness of the proposed method that removes most oxygen-containing groups of GO by chemical reduction with VC.…”

Section: Morphology and Characterization Of The Samplementioning

confidence: 88%

“…The 2D G featuring high conductivity and high flexibility, which can obtain excellent electromechanical performance of the conductive TPU foams. [37][38][39][40][41][42] The research by Chen et al showed that the G/TPU foam has a high electrical conductivity (1.4 × 10 −5 S cm −1 ). [43] The G/TPU foam prepared by Wang et al has good compressibility (70%) and repeatability.…”

Section: Introductionmentioning

confidence: 99%

Wide‐Range and High‐Stability Flexible Conductive Graphene/Thermoplastic Polyurethane Foam for Piezoresistive Sensor Applications

Lü

Meng

et al. 2021

Adv Materials Technologies

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Moreover, TPU conductive polymer composed of conductive ingredients and insulating TPU matrix can be used in applications of smart sensors, electromagnetic shielding, and oil-water separation. [11][12][13][14][15][16] Through introducing a 3D porous structure to TPU conductive polymer while utilizing the advantageous abilities of light weight, large specific surface area, and high porosity of the porous structure, [17][18][19][20][21] the TPU conductive polymer foam can achieve excellent flexibility and piezoresistive performance by combining its mechanical and electrical properties, exhibiting great potential in applications of flexible pressure sensors. [22][23][24][25][26][27] In recent years, TPU conductive polymer foam has been extensively studied in field of flexible pressure sensors. This material can further be subdivided into carbon black (CB)/TPU conductive foam, carbon nanotubes (CNT)/TPU conductive foam, and graphene (G)/TPU conductive foam in terms of the conductive filler types. The 0D CB featuring with outstanding advantages in good conductivity, small size, cost-efficient, and easy availability, which can be prepared the conductive TPU foam. [28][29][30][31] Guan et al. prepared a CB/TPU foam which exhibits its performance in measuring range (20 Pa to 1.2 MPa) and sensitivity (1.12 kPa −1 ). [22] The CB/TPU foam fabricated by Zhai et al. displays a response/relaxation time (150/150 ms), workable detection range (584.4 kPa) and durability (more than 10 000 cycles at 15 kPa). [32] The 1D CNT featuring with exceptional mechanical properties, high electrical conductivity, large vertical and horizontal ratio, has been acknowledged as an ideal filler for conductive polymer composite materials. [33][34][35] Liu et al. prepared a compressible (90%) CNT/TPU foam which displays piezoresistive recoverability (50 cycles). [23] In order to improve electromechanical properties of the TPU conductive foam, two methods involving conductive foam pore design and conductive composite matrix control can be adopted. Huang et al. prepared a CNT/TPU conductive foam with aligned porous structure, realizing a linear detection range of 77% (0.92 MPa) and 2000 (6 kPa) cycle stability. [24] Wei et al. prepared a herringbone structured CNT/EP/TPU foam by using epoxy resin (EP) as Flexible pressure sensors based on thermoplastic polyurethane (TPU) conductive polymer foam can be applied to health monitoring, motion detection, and electronic skin. For satisfying the demand of long-term use in highpressure range, the TPU conductive polymer foam requires improvements in detection range, stability, and repeatability. In this paper, a flexible conductive reduced graphene oxide (rGO)/thermoplastic polyurethane (TPU) porous foam with ultra-wide pressure detection range and high-stability is proposed. First, an elastic and flexible TPU polymer foam matrix is fabricated via freezedrying. Then, the rGO/TPU foam is prepared by dip-coating it into graphene oxide (GO) solution followed by chemical reduction. The electromechanical properties ...

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“…Production of porous films through freeze-drying [ 137 , 224 , 225 , 226 , 227 , 228 , 229 , 230 ] or using sacrificial templates made of sugar [ 138 , 231 , 232 , 233 , 234 ], salt [ 233 , 234 , 235 , 236 , 237 ], or polystyrene spheres [ 73 , 238 , 239 , 240 ]. The most explored materials in these techniques are PDMS [ 73 , 138 , 231 , 232 , 234 , 235 , 237 , 238 , 240 ], graphene oxide [ 224 , 225 , 226 ], and ecoflex [ 233 , 236 ].…”

Section: Pressure Sensorsmentioning

confidence: 99%

Transduction Mechanisms, Micro-Structuring Techniques, and Applications of Electronic Skin Pressure Sensors: A Review of Recent Advances

Santos

Fortunato

Martins

et al. 2020

Sensors

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Electronic skin (e-skin), which is an electronic surrogate of human skin, aims to recreate the multifunctionality of skin by using sensing units to detect multiple stimuli, while keeping key features of skin such as low thickness, stretchability, flexibility, and conformability. One of the most important stimuli to be detected is pressure due to its relevance in a plethora of applications, from health monitoring to functional prosthesis, robotics, and human-machine-interfaces (HMI). The performance of these e-skin pressure sensors is tailored, typically through micro-structuring techniques (such as photolithography, unconventional molds, incorporation of naturally micro-structured materials, laser engraving, amongst others) to achieve high sensitivities (commonly above 1 kPa−1), which is mostly relevant for health monitoring applications, or to extend the linearity of the behavior over a larger pressure range (from few Pa to 100 kPa), an important feature for functional prosthesis. Hence, this review intends to give a generalized view over the most relevant highlights in the development and micro-structuring of e-skin pressure sensors, while contributing to update the field with the most recent research. A special emphasis is devoted to the most employed pressure transduction mechanisms, namely capacitance, piezoelectricity, piezoresistivity, and triboelectricity, as well as to materials and novel techniques more recently explored to innovate the field and bring it a step closer to general adoption by society.

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Conductive and superhydrophobic F-rGO@CNTs/chitosan aerogel for piezoresistive pressure sensor

Cited by 164 publications

References 55 publications

Sustainable, Highly Efficient and Superhydrophobic Fluorinated Silica Functionalized Chitosan Aerogel for Gravity-Driven Oil/Water Separation

Sustainable, Highly Efficient and Superhydrophobic Fluorinated Silica Functionalized Chitosan Aerogel for Gravity-Driven Oil/Water Separation

Wide‐Range and High‐Stability Flexible Conductive Graphene/Thermoplastic Polyurethane Foam for Piezoresistive Sensor Applications

Transduction Mechanisms, Micro-Structuring Techniques, and Applications of Electronic Skin Pressure Sensors: A Review of Recent Advances

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