Luminscent Graphene Quantum Dots for Organic Photovoltaic Devices

Gupta, Vinay; Chaudhary, Nikhil; Srivastava, Ritu; Sharma, G. D.; Bhardwaj, Ramil; Chand, Suresh

doi:10.1021/ja2036749

Cited by 895 publications

(644 citation statements)

References 29 publications

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“…The Raman spectroscopy of the GQDs (Fig. 1b) shows the partially disordered crystal structure of GQDs that the scattering at the edges caused [29].…”

Section: Resultsmentioning

confidence: 99%

Graphene quantum dots combined with copper(II) ions as a fluorescent probe for turn-on detection of sulfide ions

Peng

Xiong

et al. 2015

Microchim Acta

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A fluorescent probe for the sensitive and selective determination of sulfide ions is presented. It is based on the use of graphene quantum dots (GQDs) which emit strong and stable blue fluorescence even at high ionic strength. Copper(II) ions cause aggregation of the GQDs and thereby quench fluorescence. The GQDs-Cu(II) aggregates can be dissociated by adding sulfide ions, and this results in fluorescence turn on. The change of fluorescence intensity is proportional to the concentration of sulfide ions. Under optimal conditions, the increase in fluorescence intensity on addition of sulfide ions is linearly related (r 2 =0.9943) to the concentration of sulfide ions in the range from 0.20 to 20 μM, and the limit of detection is 0.10 μM (at 3 σ/s). The fluorescent probe is highly selective for sulfide ions over some potentially interfering ions. The method was successfully applied to the determination of sulfide ions in real water samples and gave recoveries between 103.0 and 113.0 %.

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“…The Raman spectroscopy of the GQDs (Fig. 1b) shows the partially disordered crystal structure of GQDs that the scattering at the edges caused [29].…”

Section: Resultsmentioning

confidence: 99%

Graphene quantum dots combined with copper(II) ions as a fluorescent probe for turn-on detection of sulfide ions

Peng

Xiong

et al. 2015

Microchim Acta

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“…It has been demonstrated that graphene quantum dots (GQDs) blended with P3HT resulted in a significant improvement in PSC characteristics compared to graphene sheets blended with conjugated polymers. 15 However, the obtained PCE for the GQDs-based PSC was rather low (B1%). Here, we show that for PSC applications, light-emitting GQDs derived from doublewalled carbon nanotubes (DCNTs) can be used as an excellent supplement to P3HT:PCBM, rather than a replacement.…”

Section: Introductionmentioning

confidence: 94%

Enhancing the short-circuit current and power conversion efficiency of polymer solar cells with graphene quantum dots derived from double-walled carbon nanotubes

Kou

Chen

et al. 2013

NPG Asia Mater

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Derived from double-walled carbon nanotubes, graphene quantum dots (GQDs) with a uniform size distribution were prepared through solution chemistry. The GQDs in chlorobenzene exhibited bright blue emission upon UV excitation. The introduction of the GQDs into a bulk heterojunction polymer solar cell based on poly(3-hexylthiophene):(6,6)-phenyl-C61 butyric acid methyl ester (P3HT:PCBM) resulted in a significant enhancement of the power conversion efficiency (PCE). The efficiency was further improved by adjusting the PCBM content in the active layer, reaching a maximum PCE of 5.24%. This ternary system based on blended P3HT:PCBM:GQDs represents a new method to enhance the efficiency of polymer solar cells.

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“…This is mainly because CNTs have poor solubility in organic polymer matrices and wide distributions in lengths and diameters. [171][172][173][174][175] Graphene has the advantage of higher electron mobility than that of C 60 derivatives as well as energy levels easily tunable by adjusting the material's size and functionality. Furthermore, graphene's large specific surface area and 2D structure favor the formation of a bicontinuous interpenetrating network of donor and acceptor at nanometer scale with maximum interfacial area.…”

Section: Heterojunction Solar Cellsmentioning

confidence: 99%

Graphene/polymer composites for energy applications

Sun

Shi

2012

J Polym Sci B Polym Phys

236

120

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Graphene has wide potential applications in energyrelated systems, mainly because of its unique atom-thick twodimensional structure, high electrical or thermal conductivity, optical transparency, great mechanical strength, inherent flexibility, and huge specific surface area. For this purpose, graphene materials are frequently blended with polymers to form composites, especially when fabricating flexible devices. Graphene/polymer composites have been explored as electrodes of supercapacitors or lithium ion batteries, counter electrodes of dye-sensitized solar cells, transparent conducting electrodes and active layers of organic solar cells, catalytic electrodes, and polymer electrolyte membranes of fuel cells. In this review, we summarize the recent advances on the synthesis and applications of graphene/polymer composites for energy applications. The challenges and prospects in this field have also been discussed. V C 2012 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2013, 51, 231-253 KEYWORDS: composites; energy; fuel cell; graphene; lithium ion battery; redox polymers; solar cell; supercapacitor; synthesis INTRODUCTION Energy is one of the most important recent topics of concern to human society. To replace conventional fossil fuels, clean and renewable energies based on sunlight, wind, new chemicals, and biofuels are urgently demanded. Therefore, materials that can directly convert or store renewable energies are being extensively studied. Among them, graphene has recently attracted a great deal of attention because of its unique atom-thick two-dimensional (2D) structure 1,2 and excellent electrical, 2 thermal, 3 optical, and mechanical properties. 4,5 Graphene is a promising material for applications in various energy-related systems such as supercapacitors, 6-9 secondary batteries, 10-14 solar cells, 15-17 and fuel cells. [18][19][20] For this purpose, graphene materials are frequently blended with polymers to form functional composites. [21][22][23] The polymer component can improve the processability and/or flexibility of graphene materials, and also possibly provide them with new functions. To date, various graphene composites with insulating or conducting polymers (CPs) have been prepared through noncovalent 22 or covalent approaches. 24 They have also been applied as electrodes for supercapacitors and lithium ion batteries (LIBs), 25-29 counter electrodes of dye-sensitized solar cells (DSSCs), 15,30,31 and transparent conducting electrodes (TCEs) 32,33 or active layers of organic solar cells, 34 catalytic electrodes, and polymer electrolyte membranes of fuel cells. [35][36][37] This review focuses on summarizing the recent advances in the synthesis of graphene/polymer composites and their energy applications.

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Luminscent Graphene Quantum Dots for Organic Photovoltaic Devices

Cited by 895 publications

References 29 publications

Graphene quantum dots combined with copper(II) ions as a fluorescent probe for turn-on detection of sulfide ions

Graphene quantum dots combined with copper(II) ions as a fluorescent probe for turn-on detection of sulfide ions

Enhancing the short-circuit current and power conversion efficiency of polymer solar cells with graphene quantum dots derived from double-walled carbon nanotubes

Graphene/polymer composites for energy applications

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