Tunneling conduction in graphene/(poly)vinyl alcohol composite

Mitra, S.; Banerjee, Sourish; Chakravorty, D.

doi:10.1063/1.4802664

Cited by 22 publications

(19 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While the dispersion of nanoparticles does not allow direct mechanical contact between the particles, the electron transport is only possible through the polymer barrier [24][25][26] . In such case, the conduction between the CNTs is influenced by the quantum tunnelling barrier or tunnelling voltage resulting in interparticle tunnelling conduction between adjacent particles 27,28 , or by variable range hopping mechanism [29][30][31] . However, a long range microscopic conduction mechanism of electrons within a composite is governed by the percolation phenomenon 32,33 with the most important element of the theory-percolation threshold, describing the minimum volume content of the conductive nanoparticle providing the electrical conductivity 34 .…”

mentioning

confidence: 99%

Carbon nanotube embedded adhesives for real-time monitoring of adhesion failure in high performance adhesively bonded joints

Bregar

Gharavian

et al. 2020

Sci Rep

View full text Add to dashboard Cite

Carbon nanotubes (CNTs) embedded polymers are of increasing interest to scientific and industrial communities for multi-functional applications. In this article, CNTs have been introduced to high-strength epoxy adhesive for enabling in-situ strain sensing in adhesively bonded aluminium-to-aluminium single-lap joints to accurately indicate the onset and propagation of adhesion failure to the evolution of piezo-resistivity in varying mechanical loads. The CNT modified adhesive in bonded joints and the CNT modified adhesive alone have been tested under monothonic and cyclic tensile loads up to ultimate failure. The changes in the piezo-resistivity induced by the CNTs have been monitored in situ with respect to loading. A novel interpretation method has been developed for progressive, instantaneous adhesion failure estimation under cyclic tensile stresses from a resistivity baseline. The method indicates that the in-situ resistivity changes and the rate of the changes with strain, i.e. sensitivity, strongly correlate with the adhesion failure progression, irrespective of the CNT dispersion quality. Moreover, the effect of bond thickness on the evolution of piezo-resistivity and adhesion failure have been studied. It was observed that relatively thin adhesive bonds (0.18 mm thickness), possessing higher CNT contact points than thick bonds (0.43 mm thickness), provide 100 times higher sensitivity to varying cyclic loads.

show abstract

mentioning

confidence: 99%

Carbon nanotube embedded adhesives for real-time monitoring of adhesion failure in high performance adhesively bonded joints

Bregar

Gharavian

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…This is much more apparent in s, which can have monotonic increase, decrease or a local maximum vs. T. S can be affected primarily in terms of its magnitude and the characteristics of its maximum value (Fig. 8,[16][17][18][19][20][21] For example, the barrier heights are found in the 1-1000 meV range, the overlap areas are in the 0.1-100 nm 2 intervals, while w is found to be in the nm scale. The thermal conductivity typically increases nonlinearly as a function of T (Fig.…”

Section: Properties Of the Fluctuation-induced Tunnelingmentioning

confidence: 98%

“…Studies have shown that although such polymers are conducting, their transport is different than that of inorganic compounds. 14,[16][17][18][19][20][21] Much of the existing work on heavily-doped polymers is interpreted in terms of this expression for s. The Seebeck coefficient is also fit with adjustable parameters from experiment. Doping these materials introduces carriers that become trapped in these chains and form polarons and bi-polarons, 3,13 which represent coupling between charge and distortion in the chain.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectricity in polymer composites due to fluctuation-induced tunneling

Stedman

Wei

Nolas

et al. 2015

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

Transport in heavily-doped polymer composites, characterized by localized charge regions, is examined in light of the recent interest in polymers for thermoelectric applications. The developed fundamental transport theory describes carrier tunneling between charged localizations by taking into account thermally induced fluctuations of the applied potential. A range of characteristic behaviors corresponding to experimental data are described. Deviations from the Wiedemann-Franz law are also identified. This novel theory enables the determination of factors dominating the transport in polymers and a comparison to tunneling without thermal fluctuations is also provided. The obtained asymptotic expressions for the conductivity, Seebeck coefficient, and carrier thermal conductivity are particularly useful for elucidating possible routes for thermoelectric transport control and optimization.

show abstract

“…A PVA solution with a concentration of 10% w/v was prepared by dissolving PVA in deionized water at 90 C under stirring for 2 h. To prepare PVA/CB composite, 10 mL of PVA solution was mixed with the appropriate amount of CB (20,30,40,50, and 60%wt). Then 2.8 mL of crosslinking solution, prepared from 50%w/v methanol (the quencher), 10%w/v acetic acid (the pH controller), 1.20%w/v glutaraldehyde, and 10%w/v sulfuric acid (the catalyst), with solution volume ratio of 3 : 2 : 1 : 1, was added into the mixture under constant stirring for 15 min, in order to obtain a uniform distribution of the filler.…”

Section: Preparation Of Composite Filmsmentioning

confidence: 99%

“…In comparison with PVA/ CB composites, the loading for such the onset of transition was lower. 40,41 Many companies have developed ESD control films those commercially available (Table III). As seen from SEM micrographs [ Figure 1(h,i)], Al particles displayed angular morphology with low to medium sphericity.…”

Section: Electrical Conductivitymentioning

confidence: 99%

Improvement in physical and electrical properties of poly(vinyl alcohol) hydrogel conductive polymer composites

Phuchaduek

Jamnongkan

Rattanasak

et al. 2015

J of Applied Polymer Sci

View full text Add to dashboard Cite

With an aim to develop anti-electrostatic discharge materials based on biodegradable polymers, poly(vinyl alcohol) films composited with two different conductive fillers (carbon black and aluminium) at various fillers contents (20260%wt), were manufactured using solvent-casting technique. The mechanical properties of such the films were investigated through tensile stress-strain tests. Wettability and morphology of the composite films were performed by water contact angle measurement and SEM, respectively. Young's modulus of the composite films can be increased with the addition of conductive fillers. The surface of the composite films showed non-homogeneous appearance, in which the phase boundary within the composites was clearly observed and the conductive fillers formed aggregation structure at high filler concentration. In addition, the composite films exhibited better hydrophobicity when higher conductive filler content was added. TGA results suggested that both carbon black and aluminum have proven their efficiency to enhance thermal stability of poly(vinyl alcohol). Investigation of cross-cut adhesion performance of the prepared composite films revealed that carbon black-filled composites exhibited excellent adhesion strength. The effect of conductive filler content on surface resistivity of the composite films was also examined. The experimental results confirmed that both the fillers used in this study can improve the electrical conductivity of poly(vinyl alcohol) hydrogel. The surface resistivity of the composite films was reduced by several orders of magnitude when the filler of its critical concentration was applied.

show abstract

Tunneling conduction in graphene/(poly)vinyl alcohol composite

Cited by 22 publications

References 30 publications

Carbon nanotube embedded adhesives for real-time monitoring of adhesion failure in high performance adhesively bonded joints

Carbon nanotube embedded adhesives for real-time monitoring of adhesion failure in high performance adhesively bonded joints

Thermoelectricity in polymer composites due to fluctuation-induced tunneling

Improvement in physical and electrical properties of poly(vinyl alcohol) hydrogel conductive polymer composites

Contact Info

Product

Resources

About