A Graphite‐Like Zero Gap Semiconductor with an Interlayer Separation of 2.8 Å

Baskey, Moni; Saha, Shyamal Kumar

doi:10.1002/adma.201104717

Cited by 22 publications

(14 citation statements)

References 13 publications

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“…8 A. 15 Although graphene is versatile in several areas, such as electronic, magnetic, electrochemical and bio-sensing applications, 16 it remains totally unexplored in the field of optoelectronic devices due to its very poor optical properties. 17a-c Generally, the photoluminescence (PL) in carbon based nanomaterials arises due to the formation of isolated poly-aromatic structures or passivated surface defects.…”

Section: Introductionmentioning

confidence: 99%

“…[8][9][10][11][12][13][14] To overcome the limitations of the low ON/OFF ratio in a graphene based transistor due to its zero gap property, in the previous work, we have reported a new crystalline intercalated structure with an interlayer separation of 2.8 A. 15 Although graphene is versatile in several areas, such as electronic, magnetic, electrochemical and bio-sensing applications, 16 it remains totally unexplored in the field of optoelectronic devices due to its very poor optical properties. 17a-c Generally, the photoluminescence (PL) in carbon based nanomaterials arises due to the formation of isolated poly-aromatic structures or passivated surface defects.…”

Section: Introductionmentioning

confidence: 99%

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Emerging photoluminescence in azo-pyridine intercalated graphene oxide layers

Gupta

Saha

2012

Nanoscale

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Inspite of being a potential material for electronic applications graphene possesses very poor optical properties, which need to be modified to make it suitable for optoelectronic devices. To achieve superior optical properties, graphene oxide (GO) sheets are functionalized with azo-pyridine to form a new intercalated structure with an interlayer separation of 0.9 nm. These azo-pyridine intercalated GO sheets show superior optical properties with bright blue emission via excited state intra-molecular proton transfer (ESIPT) which have potential applications in graphene based optoelectronic devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Emerging photoluminescence in azo-pyridine intercalated graphene oxide layers

Gupta

Saha

2012

Nanoscale

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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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“…As predicted long ago, 53 oxygenintercalated AB-graphite was recently shown to be a zero indirect gap semiconductor. 54 Gray tin (α-Sn) is known as a zero-gap semiconductor having the diamond structure, 55 and a report on Ni(tmdt) 2 (tmdt = trimethylenetetrathiafulvalenedithiolate), may also be related to this property. 56 Figure 10.…”

Section: Electronic Properties Of Graphitynesmentioning

confidence: 98%

Carbo-graphite: Structural, Mechanical, and Electronic Properties

2013

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The bulk structure of total and partial carbo-mers of graphite, referred to as graphitynes, is investigated by first-principles calculations using the Rutgers-Chalmers nonlocal correlation functional vdW-DF2 in combination with the Cooper's exchange functional C09. This calculation level is shown to perform well for describing graphene and graphite references structures. The ABand ABC-graphityne stackings are predicted to be the most stable, with interlayer distances close to the one of the graphite parent. The atomic sparsity of the 2D-and 3D-α-graphyne materials resulting from the insertion of C 2 units, makes them much softer than the parent graphene or graphite, respectively, but they exhibit the same large elastic anisotropy. The band structures, effective masses of charge carriers, Fermi velocities, and other electronic properties of various bulk graphyne-type carbon allotropes have been calculated and are shown to depend on the number of acetylenic-like linkages between the sp 2 centers and on the stacking mode. Most of the graphitynes are predicted to be graphite-like semi-metals, except the ABC-α-graphityne exhibiting a graphenelike band-structure with two nonequivalent Dirac cones.

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A Graphite‐Like Zero Gap Semiconductor with an Interlayer Separation of 2.8 Å

Cited by 22 publications

References 13 publications

Emerging photoluminescence in azo-pyridine intercalated graphene oxide layers

Emerging photoluminescence in azo-pyridine intercalated graphene oxide layers

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

Carbo-graphite: Structural, Mechanical, and Electronic Properties

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