Graphene Quantum Sheets: A New Material for Spintronic Applications

Saha, Shyamal Kumar; Baskey, Moni; Majumdar, Dipanwita

doi:10.1002/adma.201003300

Cited by 65 publications

(42 citation statements)

References 20 publications

(17 reference statements)

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“…For the synthesis of PANI/r-GO composites, freshly synthesized ''X'' mL (Table 1) of GO (prepared by the modified Hummer's method [14,15,10] ) were taken and sonicated (Cole Parmer 8891 model, 35 kHz) for 20 min to get a clear and well-dispersed solution. To this solution, freshly distilled aniline dissolved in 10 mL of 1 M HCl was added dropwise and stirred for 20 min at 2 8C.…”

Section: Synthesismentioning

confidence: 99%

“…[4][5][6] After the discovery of graphene (single layer of graphite), graphene-based electronics has taken up a major challenging role to replace silicon technology due to its low cost production, easy processibility and superior electronic properties. [7][8][9] Besides our recent observation on ultrafine graphene quantum sheets as a promising material for spintronic application, [10] superior electronic properties, such as large room temperature mobilities, comparable conductivities for both electrons and holes, and the ability for charge carrier operation via the field effect, make graphene an excellent candidate for carbon-based electronics. [11] Although, a few efforts have already been made to engineer P-N junctions, a building block of semiconductor devices on epitaxially grown graphene sheets, [12][13] the field remains totally unexplored in terms of designing vertical structures of two different highly crystalline layers with graphene as the n-type layer and a suitable conjugated polymer as the p-type layer.…”

Section: Introductionmentioning

confidence: 99%

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Epitaxial Growth of Crystalline Polyaniline on Reduced Graphene Oxide

Majumdar

Baskey

Saha

2011

Macromol. Rapid Commun.

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Due to its unique electronic properties, graphene has already been identified as a promising material for future carbon based electronics. To develop graphene technology, the fabrication of a high quality P-N junction is a great challenge. Here, we describe a general technique to grow single crystalline polyaniline (PANI) films on graphene sheets using in situ polymerization via the oxidation-reduction of aniline monomer and graphene oxide, respectively, to fabricate a high quality P-N junction, which shows diode-like behavior with a remarkably low turn-on voltage (60 mV) and high rectification ratio (1880:1) up to a voltage of 0.2 V. The origin of these superior electronic properties is the preferential growth of a highly crystalline PANI film as well as lattice matching between the d-values [∼2.48 Å] of graphene and {120} planes of PANI.

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Section: Synthesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Epitaxial Growth of Crystalline Polyaniline on Reduced Graphene Oxide

Majumdar

Baskey

Saha

2011

Macromol. Rapid Commun.

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“…[11][12][13] Compared with traditional inorganic semiconductor QDs, CQDs with superior photostability and lower cytotoxicity have shown exceptional performance in bio-applications, especially in sensors. [14][15][16] During the last few years graphene quantum sheets and functionalized graphene based materials are used for studying different functional properties, [17][18][19] selective detection of nitro explosive 20 and adsorption of toxic metal ions (As, Hg, Cr etc.) from waste water.…”

Section: Introductionmentioning

confidence: 99%

Highly luminescent N-doped carbon quantum dots from lemon juice with porphyrin-like structures surrounded by graphitic network for sensing applications

et al. 2016

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Here we demonstrate a simple, low cost, and green synthetic approach to synthesizing water-soluble, nitrogen-doped, fluorescent carbon quantum dots (NCQDs) from lemon juice and ammonia by hydrothermal treatment. Chemical characterizations and low temperature photoluminescence and photoconductivity results show interesting structural features of the as-prepared NCQDs. These new NCQDs consist of a ring type moiety (porphyrin/chlorin) in the centre surrounded by the graphitic network and serve as an efficient fluorescent probe for label-free, sensitive, and selective detection of Fe 3+ with a detection limit of 140 ppb (2.5 mM), which is remarkably lower than the earlier reports on CQDs-based sensing systems. DFT calculations are carried out to optimise the structural aspects for selective detection of Fe 3+ . This extremely low detection limit (140 ppb) arises due to static quenching in addition to dynamic quenching which generally occurs in most cases.

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“…Moreover, in the past twenty years metal-free magnets made from carbon-based compounds have been discovered and, more recently, there have been reports on the observation of magnetism in carbon [1][2][3][4][5][6][7][8][9][10][11][12][13][14] . Metal-free carbon structures exhibiting magnetic ordering represent a new class of materials and open a novel eld of research that may lead to many new technologies 1,2) . No physical law prohibits magnetic ordering in the structures containing only light elements like carbon.…”

Section: Introductionmentioning

confidence: 99%

Ligand-Driven Exchange Coupling in Graphene-Based Magnetic Materials

et al. 2016

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Several forms of graphene-based magnetic materials have been investigated via density-functional theory utilizing dispersion correction and full geometry optimization. Our calculated results show that the perinaphthenyl radical (R 1 ) has a spin of 1/2. However, in its [R 1 ] 2 dimer structure, the net spin becomes zero due to an antiferromagnetic spin-exchange between radicals. To avoid antiferromagnetic spin-exchange of identical face-to-face radicals, the alternating stack of composition R 1 /D 25 /R 1 (with D 25 = graphene-based diamagnetic molecule C 34 H 16 ) has been designed and investigated. As expected, our calculated results con rm that the alternating stack R 1 /D 25 /R 1 has a ferromagnetic spin-exchange between two R 1 radicals with the spin-exchange coupling of J/k B = 277 K, and the spin moment of m = 2 μ B (Bohr magneton unit). In order to explore ways to tailor spin-exchange coupling in stacks, ve other R 1 /D 25 /R 1 -based alternating stacks with different ligand con gurations of R 1 have been designed and investigated. Interestingly, ferromagnetic spin-exchange in stacks can be enhanced by substituting ligands having a weak electron af nity for H atoms of a R 1 molecule, while it can be weakened by substituting ligands having high electron af nity for H atoms of a R 1 radical. These results can be explained in terms of the competitive hybridization between the HOMO (highest occupied molecular orbital) of radicals and the HOMO and LUMO (lowest unoccupied molecular orbital) of diamagnetic molecules. These results would give some indication for how the spin-exchange coupling in graphene-based alternating stacks can be tailored.

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Graphene Quantum Sheets: A New Material for Spintronic Applications

Cited by 65 publications

References 20 publications

Epitaxial Growth of Crystalline Polyaniline on Reduced Graphene Oxide

Epitaxial Growth of Crystalline Polyaniline on Reduced Graphene Oxide

Highly luminescent N-doped carbon quantum dots from lemon juice with porphyrin-like structures surrounded by graphitic network for sensing applications

Ligand-Driven Exchange Coupling in Graphene-Based Magnetic Materials

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