Influence of surfactants of different nature and chain length on the morphology, thermal stability and sheet resistance of graphene (Englisch)

In: Soft Matter   ;  14 ,  29  ;  6013-6023  ;  2018

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The effects of surfactants of different nature (anionic, cationic and non-ionic) and chain length on the morphology, microstructure, thermal stability and electrical resistivity of liquid exfoliated graphene (G) were investigated. Microscopic (SEM and AFM) observations revealed that the thickness of G in the dispersions depended on the surfactant nature: non-ionic surfactants rendered the highest level of exfoliation, whilst dispersions in the cationic ones exhibited fully-covered thicker sheets; the flake thickness increased with increasing surfactant chain length. X-ray diffraction studies indicated an increased interlamellar G spacing with increasing surfactant content. Raman spectra showed an increase in the ID/IG ratio with decreasing G loading. Larger upshifts of the G, 2D and D + G bands were found with increasing surfactant concentration, particularly for dispersions in the cationic surfactants. For the same G/surfactant weight ratio, the electrical resistivity of the dispersions followed the order: cationic > non-ionic > anionic, consistent with the amount of surfactant adsorbed onto G calculated via TGA. It is demonstrated herein that the thermal and electrical properties of liquid exfoliated G can be tuned by varying the surfactant concentration, nature and chain length, which is of great importance for numerous applications like solar power harvesting, high-temperature devices and flexible nanoelectronics.

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Front cover
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Inside front cover
| 2018
Contents list
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Non-monotonic variations of the nucleation free energy in a glass-forming ultra-soft particles fluid
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Comparison among multi-chain models for entangled polymer dynamics
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Reversible fabrication and self-assembly of a gemini supra-amphiphile driven by dynamic covalent bonds
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Characterisation of protein aggregation with the Smoluchowski coagulation approach for use in biopharmaceuticals
Zidar, M. / Kuzman, D. / Ravnik, M. | 2018
Influence of surfactants of different nature and chain length on the morphology, thermal stability and sheet resistance of graphene
Díez-Pascual, Ana M. / Vallés, Cristina / Mateos, Rocío / Vera-López, Soledad / Kinloch, Ian A. / Andrés, María Paz San | 2018
Thermomechanical properties of monodomain nematic main-chain liquid crystal elastomers
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Change in collective motion of colloidal particles driven by an optical vortex with driving force and spatial confinement
Saito, Keita / Okubo, Shogo / Kimura, Yasuyuki | 2018
Diffusiophoretically induced interactions between chemically active and inert particles
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Charge regulating macro-ions in salt solutions: screening properties and electrostatic interactions
Avni, Y. / Markovich, T. / Podgornik, R. / Andelman, D. | 2018
Influence of the surface limiting elasticity modulus on the impact behavior of droplets of difenoconazole-loaded mesoporous silica nanoparticles with associated SDS
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Automated crystal characterization with a fast neighborhood graph analysis method
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Computational investigation of actuation mechanisms of droplets on porous air-permeable substrates
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Probing translational and rotational dynamics in hydrophilic/hydrophobic anion based imidazolium ionic liquid–water mixtures
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Inside back cover
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Back cover
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