Nanocellulose-assisted dispersion of graphene to fabricate poly(vinyl alcohol)/graphene nanocomposite for humidity sensing

Xu, Shengqian; Yu, Wenjin; Yao, Xuelin; Zhang, Qin; Fu, Qiang

doi:10.1016/j.compscitech.2016.05.014

Cited by 103 publications

(35 citation statements)

References 54 publications

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“…Obviously, the GN aggregates were divided into thinner GN layers without significant overlap in the large area. Because of the electrostatic repulsion behavior of CNFs, the hydrophobic interactions between specific crystalline surfaces on the CNFs and GN, CNFs were capable of uniformly dispersing GN in water [32,33]. As shown in Figure 2d, the pure GN and GN-CNF nanocomplexes were dispersed well after 1 h of stirring.…”

Section: Resultsmentioning

confidence: 99%

Highly Stretchable and Self-Healing Strain Sensors Based on Nanocellulose-Supported Graphene Dispersed in Electro-Conductive Hydrogels

et al. 2019

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Intrinsic self-healing and highly stretchable electro-conductive hydrogels demonstrate wide-ranging utilization in intelligent electronic skin. Herein, we propose a new class of strain sensors prepared by cellulose nanofibers (CNFs) and graphene (GN) co-incorporated poly (vinyl alcohol)-borax (GN-CNF@PVA) hydrogel. The borax can reversibly and dynamically associate with poly (vinyl alcohol) (PVA) and GN-CNF nanocomplexes as a cross-linking agent, providing a tough and flexible network with the hydrogels. CNFs act as a bio-template and dispersant to support GN to create homogeneous GN-CNF aqueous dispersion, endowing the GN-CNF@PVA gels with promoted mechanical flexibility, strength and good conductivity. The resulting composite gels have high stretchability (break-up elongation up to 1000%), excellent viscoelasticity (storage modulus up to 3.7 kPa), rapid self-healing ability (20 s) and high healing efficiency (97.7 ± 1.2%). Due to effective electric pathways provided by GN-CNF nanocomplexes, the strain sensors integrated by GN-CNF@PVA hydrogel with good responsiveness, stability and repeatability can efficiently identify and monitor the various human motions with the gauge factor (GF) of about 3.8, showing promising applications in the field of wearable sensing devices.

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Section: Resultsmentioning

confidence: 99%

Highly Stretchable and Self-Healing Strain Sensors Based on Nanocellulose-Supported Graphene Dispersed in Electro-Conductive Hydrogels

et al. 2019

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“…Compared with the SPI/graphene film, the EB value of SPI/graphene/CNC film showed a slight increase from 74.92% to 105.83%, suggesting the improved flexibility of the composite film. This phenomenon was probably caused by the fact that CNC could serve as the dispersing agent during graphene exfoliation in water and graphene sheets were well CNC-assisted dispersed in the SPI matrix [ 43 ]. The homogeneous dispersion and strong interfacial interactions between graphene and CNC could lead to a significant improvement on mechanical behaviors of the SPI-based films.…”

Section: Resultsmentioning

confidence: 99%

“…However, compared with the control film, the MC and WU of SPI/graphene/PCNC film were significantly decreased by 24.54% and 47.18%, respectively. These results could be attributed to the presence of enhanced hydrogen bonds between the filler and SPI matrix, which decreased the diffusion speed of water molecules into the cross-linked structure [ 43 ]. In addition, the tortuosity effect of the relatively dense and integrated structure could prevent the SPI matrix from swelling under high moisture conditions, which resulted in the superior water resistance of the nanocomposite film [ 34 ].…”

Section: Resultsmentioning

confidence: 99%

Improvement in Functional Properties of Soy Protein Isolate-Based Film by Cellulose Nanocrystal–Graphene Artificial Nacre Nanocomposite

et al. 2017

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A facile, inexpensive, and green approach for the production of stable graphene dispersion was proposed in this study. We fabricated soy protein isolate (SPI)-based nanocomposite films with the combination of 2D negative charged graphene and 1D positive charged polyethyleneimine (PEI)-modified cellulose nanocrystals (CNC) via a layer-by-layer assembly method. The morphologies and surface charges of graphene sheets and CNC segments were characterized by atomic force microscopy and Zeta potential measurements. The hydrogen bonds and multiple interface interactions between the filler and SPI matrix were analyzed by Attenuated Total Reflectance-Fourier Transform Infrared spectra and X-ray diffraction patterns. Scanning electron microscopy demonstrated the cross-linked and laminated structures in the fracture surface of the films. In comparison with the unmodified SPI film, the tensile strength and surface contact angles of the SPI/graphene/PEI-CNC film were significantly improved, by 99.73% and 37.13% respectively. The UV-visible light barrier ability, water resistance, and thermal stability were also obviously enhanced. With these improved functional properties, this novel bio-nanocomposite film showed considerable potential for application for food packaging materials.

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“…Then, they demonstrated that the incorporation of GO can highly improve the humidity sensor based on cellulose nanocrystal (CNC) due to the increased water molecule adsorption; the water uptake of the cellulose/GO composite in 90% RH was almost two times higher than the pristine cellulose film [167]. Nanocellulose was also used to assist graphene dispersion in the PVA nanocomposite (PVA/NFC/rGO) for humidity sensing, and the abundant hydroxyl groups on the surface of nanocellulose formed hydrogen bonds with water molecules for an improved sensitivity and decreased hysteresis [168]. Recently, Chen et al prepared a cellulose/graphene composite film using an eco-friendly process by dispersing GO and cellulose homogeneously followed by in situ chemical reduction of GO to rGO, endowing the film with high conductivity and good mechanical properties [169].…”

Section: Humidity Sensors Based On Graphene Materialsmentioning

confidence: 99%

Recent Advances in Graphene-Based Humidity Sensors

et al. 2019

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Humidity sensors are a common, but important type of sensors in our daily life and industrial processing. Graphene and graphene-based materials have shown great potential for detecting humidity due to their ultrahigh specific surface areas, extremely high electron mobility at room temperature, and low electrical noise due to the quality of its crystal lattice and its very high electrical conductivity. However, there are still no specific reviews on the progresses of graphene-based humidity sensors. This review focuses on the recent advances in graphene-based humidity sensors, starting from an introduction on the preparation and properties of graphene materials and the sensing mechanisms of seven types of commonly studied graphene-based humidity sensors, and mainly summarizes the recent advances in the preparation and performance of humidity sensors based on pristine graphene, graphene oxide, reduced graphene oxide, graphene quantum dots, and a wide variety of graphene based composite materials, including chemical modification, polymer, metal, metal oxide, and other 2D materials. The remaining challenges along with future trends in high-performance graphene-based humidity sensors are also discussed.

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Nanocellulose-assisted dispersion of graphene to fabricate poly(vinyl alcohol)/graphene nanocomposite for humidity sensing

Cited by 103 publications

References 54 publications

Highly Stretchable and Self-Healing Strain Sensors Based on Nanocellulose-Supported Graphene Dispersed in Electro-Conductive Hydrogels

Highly Stretchable and Self-Healing Strain Sensors Based on Nanocellulose-Supported Graphene Dispersed in Electro-Conductive Hydrogels

Improvement in Functional Properties of Soy Protein Isolate-Based Film by Cellulose Nanocrystal–Graphene Artificial Nacre Nanocomposite

Recent Advances in Graphene-Based Humidity Sensors

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