Free-Radical-Assisted Rapid Synthesis of Graphene Quantum Dots and Their Oxidizability Studies.

This work reports a modified electrochemical method for rapid and large-scale preparing graphene quantum dots (GQDs) by introduction of active free radicals, which were produced by hydrogen peroxide or ultraviolet radiation. These free radicals can deepen the oxidized or reduced level of working electrode in electrochemical process and thus lead to GQDs with high concentration and small size, but different surface oxidized degree. The improved oxidation and reduction mechanism were analyzed in this work. Meanwhile, the optical properties and oxidizability of GQDs with different surface oxidized degree were investigated. It is found that these GQDs can be used as an oxidizing agent and their oxidizability is related to the degree being oxidized.

[1]  Hyoyoung Lee,et al.  Graphene quantum dots and their possible energy applications: A review , 2016 .

[2]  Zhian Zhang,et al.  Synergistically enhanced activity of graphene quantum dots/graphene hydrogel composites: a novel all-carbon hybrid electrocatalyst for metal/air batteries. , 2016, Nanoscale.

[3]  D. Zhao,et al.  The dual roles of functional groups in the photoluminescence of graphene quantum dots. , 2016, Nanoscale.

[4]  H. Xiong,et al.  Full-Color Light-Emitting Carbon Dots with a Surface-State-Controlled Luminescence Mechanism. , 2015, ACS nano.

[5]  Luyi Sun,et al.  Large-Scale and Controllable Synthesis of Graphene Quantum Dots from Rice Husk Biomass: A Comprehensive Utilization Strategy. , 2016, ACS applied materials & interfaces.

[6]  Xiaoguang Liu,et al.  Size controllable preparation of graphitic quantum dots and their photoluminescence behavior , 2016 .

[7]  Miguel Valcárcel,et al.  Graphene quantum dots in analytical science , 2015 .

[8]  X. Zheng,et al.  Glowing graphene quantum dots and carbon dots: properties, syntheses, and biological applications. , 2015, Small.

[9]  D. Pang,et al.  Photoluminescence‐Tunable Carbon Nanodots: Surface‐State Energy‐Gap Tuning , 2015, Advanced materials.

[10]  Bai Yang,et al.  The photoluminescence mechanism in carbon dots (graphene quantum dots, carbon nanodots, and polymer dots): current state and future perspective , 2015, Nano Research.

[11]  Ki-Bum Lee,et al.  Design, synthesis, and characterization of graphene-nanoparticle hybrid materials for bioapplications. , 2015, Chemical reviews.

[12]  Y. Uraoka,et al.  Reversible Oxidation of Graphene Through Ultraviolet/Ozone Treatment and Its Nonthermal Reduction through Ultraviolet Irradiation , 2014 .

[13]  M. Roushani,et al.  Novel electrochemical sensor based on graphene quantum dots/riboflavin nanocomposite for the detection of persulfate , 2014 .

[14]  Yunsheng Xia,et al.  A reformative oxidation strategy using high concentration nitric acid for enhancing the emission performance of graphene quantum dots , 2014 .

[15]  Jun Chen,et al.  Edge-enriched graphene quantum dots for enhanced photo-luminescence and supercapacitance. , 2014, Nanoscale.

[16]  I. P. Chen,et al.  One pot synthesis of graphene quantum disks derived from single-layered exfoliated graphene sheets and their application in bioimaging , 2014 .

[17]  S. Back,et al.  Ordered Supramolecular Gels Based on Graphene Oxide and Tetracationic Cyclophanes , 2014, Advanced materials.

[18]  Bai Yang,et al.  Common origin of green luminescence in carbon nanodots and graphene quantum dots. , 2014, ACS nano.

[19]  Yiyang Liu,et al.  Single-particle fluorescence intensity fluctuations of carbon nanodots. , 2014, Nano letters.

[20]  Q. Xue,et al.  Enhancement in the fluorescence of graphene quantum dots by hydrazine hydrate reduction , 2014 .

[21]  Lan Jiang,et al.  Spontaneous Reduction and Assembly of Graphene oxide into Three-Dimensional Graphene Network on Arbitrary Conductive Substrates , 2013, Scientific Reports.

[22]  Y. Miyauchi,et al.  Exploring the Origin of Blue and Ultraviolet Fluorescence in Graphene Oxide. , 2013, The journal of physical chemistry letters.

[23]  Xiaodong Chen,et al.  Ambient Fabrication of Large‐Area Graphene Films via a Synchronous Reduction and Assembly Strategy , 2013, Advanced materials.

[24]  Lei Tao,et al.  Large scale preparation of graphene quantum dots from graphite with tunable fluorescence properties. , 2013, Physical chemistry chemical physics : PCCP.

[25]  H. García,et al.  Preparation of graphene quantum dots from pyrolyzed alginate. , 2013, Langmuir : the ACS journal of surfaces and colloids.

[26]  Juan Peng,et al.  Focusing on luminescent graphene quantum dots: current status and future perspectives. , 2013, Nanoscale.

[27]  A. Rao,et al.  Evidence for Edge‐State Photoluminescence in Graphene Quantum Dots , 2013 .

[28]  Yong‐Lai Zhang,et al.  Graphitic carbon quantum dots as a fluorescent sensing platform for highly efficient detection of Fe3+ ions , 2013 .

[29]  X. Qu,et al.  Improvement of photoluminescence of graphene quantum dots with a biocompatible photochemical reduction pathway and its bioimaging application. , 2013, ACS applied materials & interfaces.

[30]  Xiaogang Qu,et al.  Ag nanoparticle-decorated graphene quantum dots for label-free, rapid and sensitive detection of Ag+ and biothiols. , 2013, Chemical communications.

[31]  Lufeng Yang,et al.  One-step preparation of nitrogen-doped graphene quantum dots from oxidized debris of graphene oxide. , 2013, Journal of materials chemistry. B.

[32]  Seokwoo Jeon,et al.  Tuning the photoluminescence of graphene quantum dots through the charge transfer effect of functional groups. , 2013, ACS nano.

[33]  Bai Yang,et al.  Surface Chemistry Routes to Modulate the Photoluminescence of Graphene Quantum Dots: From Fluorescence Mechanism to Up‐Conversion Bioimaging Applications , 2012 .

[34]  Jiewei Li,et al.  The Origin of Fluorescence from Graphene Oxide , 2012, Scientific Reports.

[35]  Chang Ming Li,et al.  One-step and high yield simultaneous preparation of single- and multi-layer graphene quantum dots from CX-72 carbon black , 2012 .

[36]  Lingling Li,et al.  A Facile Microwave Avenue to Electrochemiluminescent Two‐Color Graphene Quantum Dots , 2012 .

[37]  Jingyan Zhang,et al.  Photo-Fenton reaction of graphene oxide: a new strategy to prepare graphene quantum dots for DNA cleavage. , 2012, ACS nano.

[38]  Jianhua Hao,et al.  Deep ultraviolet photoluminescence of water-soluble self-passivated graphene quantum dots. , 2012, ACS nano.

[39]  Ying Fu,et al.  Facile synthesis of water-soluble, highly fluorescent graphene quantum dots as a robust biological label for stem cells , 2012 .

[40]  Mingwang Shao,et al.  Upconversion and downconversion fluorescent graphene quantum dots: ultrasonic preparation and photocatalysis. , 2012, ACS nano.

[41]  B. K. Gupta,et al.  Graphene quantum dots derived from carbon fibers. , 2012, Nano letters.

[42]  Yi Lin,et al.  Electrochemical Tuning of Luminescent Carbon Nanodots: From Preparation to Luminescence Mechanism , 2011, Advanced materials.

[43]  L. Dai,et al.  Oxidizing metal ions with graphene oxide: the in situ formation of magnetic nanoparticles on self-reduced graphene sheets for multifunctional applications. , 2011, Chemical communications.

[44]  Shengtong Sun,et al.  A one-step strategy for thermal- and pH-responsive graphene oxide interpenetrating polymer hydrogel networks , 2011 .

[45]  L. Qu,et al.  An Electrochemical Avenue to Green‐Luminescent Graphene Quantum Dots as Potential Electron‐Acceptors for Photovoltaics , 2011, Advanced materials.

[46]  F. Wei,et al.  Facile synthesis of graphene nanosheets via Fe reduction of exfoliated graphite oxide. , 2011, ACS nano.

[47]  Hui-Ming Cheng,et al.  Direct reduction of graphene oxide films into highly conductive and flexible graphene films by hydrohalic acids , 2010 .

[48]  G. Eda,et al.  Chemically Derived Graphene Oxide: Towards Large‐Area Thin‐Film Electronics and Optoelectronics , 2010, Advanced materials.

[49]  Jun Yan,et al.  An environmentally friendly and efficient route for the reduction of graphene oxide by aluminum powder , 2010 .

[50]  Minghong Wu,et al.  Hydrothermal Route for Cutting Graphene Sheets into Blue‐Luminescent Graphene Quantum Dots , 2010, Advanced materials.

[51]  Juan Casado,et al.  Electrochemical Destruction of Aniline and 4‐Chloroaniline for Wastewater Treatment Using a Carbon‐PTFE O 2 ‐ Fed Cathode , 1995 .