Self-Assembly of Biofunctional Polymer on Graphene Nanoribbons

Reuven, Darkeyah G.; Suggs, Kelvin; Williams, M. D.; Wang, Xiaoqian

doi:10.1021/nn204825b

Cited by 15 publications

(22 citation statements)

References 34 publications

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“…The flakes at the network edges making an interface with the glass lie flat, confirming significant adhesion interactions (a thickness of a few nanometers is detected at the edges, Fig. 36,37 The observed densification of matter in the centers of f-1, f-2, and f-3 ( Fig. 3 HR images), while the top curved flakes suggest an excess of the flakes, which is linked to an excessive initial concentration.…”

mentioning

confidence: 64%

“…In principle, these autoscalable structures achieve the goal of nanomicromacro scale multiplication. 36,37 While the formation of branched structures is further elucidated, their impact on percolation phenomena in the conductive films is rarely studied. [16][17][18][19] The formation of self-assembled structures from dried nanofluids is not entirely understood and final morphologies depend on many factors such as solvent, evaporation conditions, particle size, identity, concentration and thermodynamic state, which affect chemical potential, nanoparticle mobility and attractions (repulsions) between particles, particles and substrate, and particles and solvent.…”

mentioning

confidence: 99%

“…43 The measurements, in addition, were performed after annealing of the samples at 400 1C in He for 4 h, which aimed to remove the adsorbed impurities and solvent residues. 36,37 One thing is certain: the presented self-assembly allows percolation to occur at lower FLG concentration for a given surface, while the low coverage of the substrate surface can increase, additionally, to the transparency of the film. 36 The investigations performed earlier considering FLG-Abl flakes show that, when they are randomly deposited on glass substrate by hot spray techniques, the charge-transport performance is much lower.…”

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confidence: 99%

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Evaporation-induced self-assembling of few-layer graphene into a fractal-like conductive macro-network with a reduction of percolation threshold

Janowska

2015

Phys. Chem. Chem. Phys.

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The transcription of nanoproperties to other dimensions in an efficient and simple way by the appropriate design of devices is a challenge, and conductive nanocarbon systems are considered here. The evaporation-induced self-assembling method is proposed to form branched, fractal-like "2D" conductive macrostructures from (nano) micro few-layer graphene flakes. The self-assembled conductive graphene networks reveal a reduction of percolation threshold compared to a random arrangement (a lower matter concentration is required to make a given substrate conductive and at a lower coverage), and become a promising matrix for conductive (transparent) films. The method is easy, cost-efficient and can potentially be applied on unlimited surfaces.

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confidence: 64%

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confidence: 99%

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confidence: 99%

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Evaporation-induced self-assembling of few-layer graphene into a fractal-like conductive macro-network with a reduction of percolation threshold

Janowska

2015

Phys. Chem. Chem. Phys.

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“…Such a choice prevents the formation of an electron injection barrier. Facilitating the charge injection improves the device performance, and tuning the WF of electrode to match the HOMO (or valence band) and/or LUMO (conducting band) of the active layers is essential [ 104 , 105 ]. Several physical and chemical methods including depositing the dopant atoms [ 106 ], absorption of gas molecules [ 107 ] or use of aromatic compounds [ 108 , 109 , 110 , 111 ] have recently been proposed for tuning the WR of graphene.…”

Section: Work Function and Tuning Of The Work Function Of Graphenementioning

confidence: 99%

Work Function Engineering of Graphene

2014

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Graphene is a two dimensional one atom thick allotrope of carbon that displays unusual crystal structure, electronic characteristics, charge transport behavior, optical clarity, physical & mechanical properties, thermal conductivity and much more that is yet to be discovered. Consequently, it has generated unprecedented excitement in the scientific community; and is of great interest to wide ranging industries including semiconductor, optoelectronics and printed electronics. Graphene is considered to be a next-generation conducting material with a remarkable band-gap structure, and has the potential to replace traditional electrode materials in optoelectronic devices. It has also been identified as one of the most promising materials for post-silicon electronics. For many such applications, modulation of the electrical and optical properties, together with tuning the band gap and the resulting work function of zero band gap graphene are critical in achieving the desired properties and outcome. In understanding the importance, a number of strategies including various functionalization, doping and hybridization have recently been identified and explored to successfully alter the work function of graphene. In this review we primarily highlight the different ways of surface modification, which have been used to specifically modify the band gap of graphene and its work function. This article focuses on the most recent perspectives, current trends and gives some indication of future challenges and possibilities.

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“…It was shown earlier that in a poly (2methoxystyrene)/graphene composite, the polymer backbone serves as charge donors to graphene, resulting in the doping of graphene. 53 The distinctive doping behaviour between atactic and isotactic polymers is thus of importance to the relative interaction strength with SWNTs. The 500 MHz 1 H-NMR spectra of a SWNT-polymer chloroform (deuterated) solutions show changes in chemical shifts as a function of increasing SWNT.…”

Section: Solution and Solid State Nmr Studiesmentioning

confidence: 99%

Effect of polymer stereoregularity on polystyrene/single-walled carbon nanotube interactions

et al. 2015

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We use a combination of computational and experimental studies to elucidate the effect of polymer stereoregularity on the capability of polystyrene interacting with single-walled carbon nanotube (SWNT) surfaces. Calculated binding energies on complexes of lightly oxidized SWNT with isotactic and atactic polystyrene favor the former, which suggests that the isotactic polymer interacts more effectively with the SWNT. The glass transition temperature (T g ) of the isotactic polystyrene/SWNT matrix increases from 90.9 to 100.5 o C as the SWNT content is increased to 0.5%, whereas the glass transition temperature of the atactic polystyrene/SWNT matrix is invariant with increasing SWNT content. Rotating frame 13 C T 1ρ relaxation rates for the isotactic polymer/SWNT matrix increases from 2.15 to 2.43 ms as SWNT is increased from 0.25 to 1.0 %. However, the rotating frame 13 C T 1ρ relaxation rates for the atactic polymer/SWNT matrix decreases from 2.50 to 1.60 ms as SWNT is increased from 0.25 to 1.0 %. Our results demonstrate that the SWNT is better dispersed within the isotactic polystyrene and the better dispersion is associated with more effective interaction of isotactic polymer with the SWNT surface.

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Self-Assembly of Biofunctional Polymer on Graphene Nanoribbons

Cited by 15 publications

References 34 publications

Evaporation-induced self-assembling of few-layer graphene into a fractal-like conductive macro-network with a reduction of percolation threshold

Evaporation-induced self-assembling of few-layer graphene into a fractal-like conductive macro-network with a reduction of percolation threshold

Work Function Engineering of Graphene

Effect of polymer stereoregularity on polystyrene/single-walled carbon nanotube interactions

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