SDS-stabilized graphene nanosheets for highly electrically conductive adhesives

Amoli, Behnam Meschi; Trinidad, Josh; Rivers, Geoffrey; Sy, Serubbabel; Russo, Paola; Yu, Aping; Zhou, Norman Y.; Zhao, Boxin

doi:10.1016/j.carbon.2015.04.039

Cited by 45 publications

(23 citation statements)

References 47 publications

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“…SDS could markedly reduce non-specific binding in hybridization reactions [57], with the additional benefit of an ability to suppress nuclease activity. This surfactant was preferred to Triton X-100 or Tween-20 for maintaining GO as a stable colloid [55,58] and, above a 40 µM concentration, SDS could maintain stable graphenic colloidal suspensions for over a year [21]. The order of the assay buffer preparation steps was important; the initial non-covalent modification of GO with SDS before its exposure to BSA was key to preventing GO aggregation.…”

Section: Discussionmentioning

confidence: 99%

Oligonucleotide Detection and Optical Measurement with Graphene Oxide in the Presence of Bovine Serum Albumin Enabled by Use of Surfactants and Salts

2020

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As graphene oxide-based oligonucleotide biosensors improve, there is a growing need to explore their ability to retain high sensitivity for low target concentrations in the context of biological fluids. Therefore, we innovatively combined assay milieu factors that could influence the key performance parameters of DNA hybridization and graphene oxide (GO) colloid dispersion, verifying their suitability to enhance oligonucleotide–GO interactions and biosensor performance. As a model system, we tested single-strand (ss) DNA detection in a complex solution containing bovine serum albumin (BSA) and salts with surfactants. A fluorescein conjugated 30-mer oligonucleotide ssDNA probe was combined with its complementary cDNA target, together with solute dispersed GO and either non-ionic (Triton X-100 and Tween-20) or anionic sodium dodecyl sulfate (SDS) surfactants. In this context, we compared the effect of divalent Mg2+ or monovalent Na+ salts on GO binding for the quench-based detection of specific target–probe DNA hybridization. GO biosensor strategies for quench-based DNA detection include a “turn on” enhancement of fluorescence upon target–probe interaction versus a “turn off” decreased fluorescence for the GO-bound probe. We found that the sensitive and specific detection of low concentrations of oligonucleotide target was best achieved using a strategy that involved target–probe DNA hybridization in the solution with a subsequent modified “turn-off” GO capture and the quenching of the unhybridized probe. Using carefully formulated assay procedures that prevented GO aggregation, the preferential binding and quenching of the unhybridized probe were both achieved using 0.1% BSA, 0.065% SDS and 6 mM NaCl. This resulted in the sensitive measurement of the specific target–probe complexes remaining in the solution. The fluorescein-conjugated single stranded probe (FAM–ssDNA) exhibited linearity to cDNA hybridization with concentrations in the range of 1–8 nM, with a limit of detection equivalent to 0.1 pmoles of target in 100 µL of assay mix. We highlight a general approach that may be adopted for oligonucleotide target detection within complex solutions.

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Section: Discussionmentioning

confidence: 99%

Oligonucleotide Detection and Optical Measurement with Graphene Oxide in the Presence of Bovine Serum Albumin Enabled by Use of Surfactants and Salts

2020

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“…29 Therefore, SDS and GA have been widely used to disperse graphene. For example, Amoli et al 30 prepared an electrically conductive adhesive, by using SDS, a stable graphene dispersion had been achieved and the resultant material showed significant electrical conductivity at noticeably low graphene content. Hajian et al 31 prepared polyvinyl butyral/graphene nanocomposite by SDS, the prepared nanocomposites showed good toughness and flexibility.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Amoli et al. 30 prepared an electrically conductive adhesive, by using SDS, a stable graphene dispersion had been achieved and the resultant material showed significant electrical conductivity at noticeably low graphene content. Hajian et al.…”

Section: Introductionmentioning

confidence: 99%

Effects of surfactants on the properties of epoxy/graphene nanocomposites

Wei

Saharudin

2018

Journal of Reinforced Plastics and Composites

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Recently, graphene has attracted extensive research interests due to its superior mechanical, electrical and thermal performance. Small loadings of graphene can increase the properties of epoxy significantly. However, because of the large surface area of graphene, it is a challenge to disperse graphene in liquid epoxy. Strong van der Waals force causes reaggregation of graphene in the matrix. As commonly used surfactants, sodium dodecyl sulphate and gum arabic have been used a lot to de-bundle graphene, however, their dispersing efficiencies for graphene in epoxy matrix is unknown. Therefore, to evaluate their dispersing efficiencies, epoxy/graphene nanocomposites had been made and mechanical properties, dynamic mechanical analyzer, thermal gravimetric analysis and scanning electron microscopy images of nanocomposites had been tested. The results show that the properties of nanocomposites had been enhanced largely after using sodium dodecyl sulphate and gum arabic. Sodium dodecyl sulphate shows higher dispersing effective-ness than gum arabic.

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“…However, among these properties, the electrical conductivity and mechanical strength of the conductive adhesive are of primary concern [9,18,[20][21][22]. While most research focuses on improving the electrical conductivity of ECAs [23][24][25][26][27], there are limited studies on the evaluation of their mechanical properties [22]. This work aims to study the mechanical bonding properties of isotropic conductive adhesives for microelectronic packaging applications that seek to bind electrical components onto a printed circuit board (PCB).…”

Section: Introductionmentioning

confidence: 99%

“…In a recent work, we have demonstrated that sodium dodecyl sulfate (SDS)-modified graphene (Gr(s)) as a co-filler for conventional conductive adhesives (CCA) significantly improved the electrical conductivity. Graphene nanosheets are exfoliated in a noncovalent manner by SDS molecules in solvent after undergoing ultrasonic bath, thereby taking full advantage of the remarkable intrinsic properties of graphene (see [23] for details). Despite the benefits of better dispersion that solvent assistance offers, there is always a concern that thermal and mechanical properties might be negatively affected when residual solvent is present in the mixture [12,23,28].…”

Section: Introductionmentioning

confidence: 99%

Solvent presence and its impact on the lap-shear strength of SDS-decorated graphene hybrid electrically conductive adhesives

Trinidad

Chen

Lian

et al. 2017

International Journal of Adhesion and Adhesives

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The mechanical bonding strength of electrically conductive adhesives (ECAs), as well as the impact of residual solvent on the bonding strength was investigated between a copper clad FR-4 surface and conductive adhesives using Lap-shear testing. Both solvent-free and solvent-assisted formulations with various filler concentrations of silver (Ag) and sodium dodecyl sulfate (SDS)-decorated graphene (Gr(s)) in epoxy matrices were prepared and compared. It was found that the introduction of 0.75 wt% Gr(s) in solventfree formulations increased the Lap-shear strength (LSS), while the combination of ethanol solvent and SDS in solvent-assisted formulations significantly decreased the LSS.In addition, it was found that increasing the Ag content generally lowers the LSS for both the solvent-free and solvent-assisted formulations. By examining the structure and interface of both formulations using optical microscopy, surface profilometry and SEM, we found that the solvent-assisted formulations exhibit more voids at the surface of the paste and more bubble formation throughout the material compared to the solvent-free formulations. Therefore, the significant drops of LSS in solvent-assisted Gr(s)-filled formulations may be attributed to the formation of bubbles at the micron range during the curing process.

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SDS-stabilized graphene nanosheets for highly electrically conductive adhesives

Cited by 45 publications

References 47 publications

Oligonucleotide Detection and Optical Measurement with Graphene Oxide in the Presence of Bovine Serum Albumin Enabled by Use of Surfactants and Salts

Oligonucleotide Detection and Optical Measurement with Graphene Oxide in the Presence of Bovine Serum Albumin Enabled by Use of Surfactants and Salts

Effects of surfactants on the properties of epoxy/graphene nanocomposites

Solvent presence and its impact on the lap-shear strength of SDS-decorated graphene hybrid electrically conductive adhesives

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