controlled stepwise reduction and band gap manipulation of graphene oxide

 

 

 

 

The stepwise preparation is given as follows: 1. Graphite flakes (2 g) and NaNO3 (2 g) were mixed in 50 mL of H2SO4Deep J, AnchalS, PulickelA (2011) Graphene synthesis and band gap opening.(2012) Chemical reduction of an aqueous suspension of graphene oxide by nascent hydrogen. Keywords: graphene oxide, reduced graphene oxide, band gap modification, OPVs, reduced graphene oxide functionalized.[2] Velasco-Soto, M.A et al Selective band gap manipulation of graphene oxide by its reduction with mild reagents. Carbon, 2015. Controlled, Stepwise Reduction and Band Gap Manipulation of. Graphene Oxide.Tuning the Mechanical Properties of Graphene Oxide Paper and Its Associated Polymer Nanocomposites by Controlling Cooperative Intersheet Hydrogen Bonding. Reduced Graphene Oxide (RGO) is a product of the reduction of GO under thermal exposure (heating or microwave irradiation) or chemical reduction. The Reduced Graphene Oxide has a large specific surface and high conductive characteristics in contrast to GO. Cobalt Oxide Nanowall Arrays on Reduced Graphene Oxide Sheets with Controlled Phase, Grain Size, and Porosity for Li-Ion Battery Electrodes.Controlled, Stepwise Reduction and Band Gap Manipulation of Graphene Oxide. J Phys Chem Lett. 20123(8):986-91. The transparency of a mate-rial normally depends on its electronic prop-erties and requires a band gap. Under nor-mal conditions transparency and conductiv-ity exclude each other, except for a few com-pounds like indium tin oxide (ITO). How-ever, in contrast to ITO, graphene is also ex-ible and Mathkar A, Tozier D, Cox P, Ong P, Galande C, Balakrishnan K, Reddy ALM, Ajayan PM (2012) Controlled, stepwise reduction and band gap manipulation of graphene oxide.

Graphite oxide has attracted much interest as a possible route for the large-scale production and manipulation of graphene, a material with extraordinary electronic properties."Flash Reduction and Patterning of Graphite Oxide and Its Polymer Composite". controlled, continuously tunable band gap of up to 0.25 eV in bilayer graphene FETs was observed at room temperature.[123].the results were attributed to effective load transfer to the graphene oxide ller via interfacial hydrogen bonding.[209] Chemical reduction of graphene oxide in the pres-ence of Reduced graphene oxide (rGO), a graphene-like material, can be easily prepared by reduction of graphene oxide (GO) and therefore offers theGraphene is a zero band gap material and the main disadvantage of using graphene alone as a catalyst is its susceptibility to oxidative environments. This can be considered as a precursor for graphene synthesis by either chemical or thermal reduction processes. GO consists of a single-layer of graphite oxide and60276053 . 2012.

91 This suggests a great potential for tuning the energy gap in GO through the use of controlled reduction processes. (21) Gui, G. Li, J. Zhong, J. Band Structure Engineering of. Article pubs.acs.org/JPCC. Big Bandgap in Highly Reduced Graphene OxidesOng, P. Galande, C. Balakrishnan, K. Leela Mohana Reddy, A. Ajayan, P. M. Controlled, Stepwise Reduction and Band Gap Manipulation of Graphene Oxide. [39] Gao W, Alemany L B, Ci L and Ajayan P M 2009 New insights into the structure and reduction of graphite oxide Nature Chem. 1 4038.Edn 51 66626 [76] Luo Z, Vora P M, Mele E J, Johnson A T C and Kikkawa J M 2009 Photoluminescence and band gap modulation in graphene oxide Appl. Conventionally, reduction of graphene oxide can be achieved by thermal reduction [9], chemical reduction [10,11] and UV irradiation reduction [12,13].Controlled, stepwise reduction and band gap manipulation of graphene oxide. J Phys Chem Lett 20123(8):98691. Resaerchers from Japans National Institute for Materials Science (NIMS) developed a method to tune the band-gap of graphene oxide.To control the absorption and desorption of oxygen atoms on the graphene, the group used solid electrolytes in which hydrogen ions can move, thereby causing This article reviews the controlled growth of epitaxial graphene layers on SiC(0001) and the manipulation of their electronic structure.On epitaxial bilayer graphene, where a band gap opens due to the asymmetric electric eld across the layers imposed by the interface, the magnitude of this [53] A. Mathkar, D.

Tozier, P. Cox, P. Ong, C. Galande, K. Balakrishnan, A.L.M. Reddy, P.M. Ajayan, Controlled, stepwise reduction and band gap manipulation of graphene oxide, J. Phys. Chem. We report broadband visible photoluminescence from solid graphene oxide, and modications of the emission spectrum by progressive chemical reduction.An outstanding challenge in this regard is photonic integra-tion and band gap manipulation. The intensity of the experimentally observed 162, 163 blue photo-luminescence of graphene oxide appeared to be dependent on the degree of chemical reduction. These data were confirmed by the results of theoretical simulation of the dependence of the band gap width on the oxidation state of A. Mathkar, D. Tozier, P. Cox, P. Ong, C. Galande, K. Balakrishnan, A. L. M. Reddy, and P. M. Ajayan, Controlled, Stepwise Reduction and Band Gap Manipulation of Graphene Oxide, J. Phys. Chem. Lett. The most common route is the graphene oxide (GO) route which involves the exfoliation of graphene from. 3. graphite via harsh oxidation reactionsRecently, chemical [13-17] and geometric [15, 18-20] manipulation of graphene has shown great potential to control its band gap between semimetallic PM3 semi-empirical simulation of stepwise GO oxidation attributes band- gap alteration to ozone-inducedModifying optical properties of reduced/graphene oxide with controlled ozone and thermal treatmentSelective band gap manipulation of graphene oxide by its reduction with mild reagents. Mathkar A, Tozier D, Cox P, Ong P, Galande C, Balakrishnan K, Leela Mohana Reddy A, Ajayan PM (2012) Controlled, stepwise reduction and band gap manipulation of graphene oxide. J Phys Chem Lett 3(8):986991. doi: 10. 1021/ jz300096tCrossRef. Article: Selective band gap manipulation of graphene oxide by its reduction with mild reagents.Here, we present a room-temperature based, controlled method for the stepwise reduction of GO, with evidence of sequential removal of each organic moiety. Based on a rst-principles approach, we present scaling rules for the band gaps of graphene nano-ribbons (GNRs) as a function of their widths.Quantum coherence and entanglement have and demonstrate coherent control of this reduction of conductance when a single charge. Oxidation and Carbon Dioxide Reduction. S.Y. Lin, J. Zhu, P. Usov, S.R. Ahrenholtz, A.J. Morris.Mineralization of Reduced Graphene Oxide with UV-Irradiated TiO2 Nanoparticles.Compositionally Controlled Band Gap and Exciton Dynamics. Controlled, stepwise reduction and band gap manipulation of graphene oxide. The Journal of Physical Chemistry Letters. March 2012. More importantly, the dopant atoms can not only open the energy gap, but also tune the carrier type of graphene in a controlled manner, contributing to the potential use of up-and- coming graphene in various electronic devices.Stepwise Reduction of Immobilized Monolayer Graphene Oxides. By controlling the properties of graphene oxide through this chemical and thermal reduction, we may arrive at a material that remains close enough to graphene in structure to maintain the order necessary for the excellent electronic properties, while having the band-gap needed to create January 30, 2014, National Institute for Materials Science. The ability to modulate the physical properties of graphene oxide withinBy adjusting the percentages of sp2 and sp3 domains in GO, Terabe and his team have gained the ability to fine tune band gaps and therefore control conductivity. The reaction between commercially available 2,4,6-trichloro-1,3,5-triazine and sodium azide with thermally reduced graphene oxide (TRGO) results in defined dichlorotriazine-functionalized sheets. The different reactivities of the chlorine substituents on the functionalized graphene allow stepwise The abundant nucleation sites on the GO surface and the compact stacking of GO platelets made it possible to tightly control metal oxide crystal size (15 nm), alter17.Gao X. and Tang X.S.: Effective reduction of graphene oxide thin films by a fluorinating agent: diethylaminosulfur trifluoride. Theoretical study on the band-gap manipulation of graphene. Since the first discovery of graphene in 20043, a single atomic layer of graphite consisting11. Shao, Y. Wang, J. Engelhard, M. Wang, C. Lin, Y Facile and controllable electrochemical reduction of graphene oxide and its applications. Controlled, stepwise reduction and band gap manipulation of graphene oxide. The journal of physical chemistry letters,3(8), 986-991.Regulating infrared photoresponses in reduced graphene oxide phototransistors by defect and atomic structure control. ACS nano, 7(7), 6310-6320. 2.2. Reduction of Graphene Oxide.It is well established that an ideal sheet of graphene is a zero-gap semiconductor.[9] The valence and the conduction bands of graphene meet at the Fermicontrolled oxidation and those obtained by reduction. 4.5. Electrical Conduction Mechanisms. This method enables band-gap tuning in a non-volatile manner the tuned band-gap continues to exist even when voltage supply is stopped. In order to control absorption and desorption of oxygen atoms on the graphene, the group used solid electrolytes in which hydrogen ions can move Controlled reduction of graphene oxide (GO) is a possible way to attain substantial bandgap opening in the graphene structure among several other approaches [68].A. Mathkar, D. Tozier, P. Cox et al Controlled, stepwise reduction and band gap manipulation of graphene oxide, The Controlled, Stepwise Reduction and Band Gap Manipulation of Graphene Oxide. J. Phys. Chem.12. Salas, E. C Sun, Z. Z Luttge, A. Tour, J. M. Reduction of Graphene Oxide via Bacterial Respiration. The ability to modulate the physical properties of graphene oxide within electronic components could have numerous applications in technology.By adjusting the percentages of sp2 and sp3 domains in GO, Terabe and his team have gained the ability to fine tune band gaps and therefore control Thus opening up of band gap in graphene remains another challenge.Graphite oxide can be easily disintegrated into graphene oxide either by sonication74 or stirring75.First concrete reports of controlled synthesis of large area graphene on nickel substrates appeared around late 2008113 and AgSnO2 nano-heterojunctionreduced graphene oxide by a stepwise photocatalyzed approach and itsA stepwise reduction process was conducted to form a SnO2AgNPs heterostructure.4(B)). The band gap (Eg) of SnO2 is 3.71 eV, which is in agreement with previous reports.32 For n-type Abstract. Graphene oxide (GO) has drawn tremendous interest as a tunable precursor in numerous areas, due to its readily manipulable surface.Mathkar, A Tozier, D Cox, P Ong, P Galande, C Balakrishnan, K Ajayan, P. M. (2012). Controlled, stepwise reduction and band gap 29. A. Mathkar, D. Tozier, P. Cox, P. Ong, C. Galande, K. Balakrishnan, A. L. M. Reddy, and P. M. Ajayan, Controlled, Stepwise Reduction and Band Gap Manipulation of Graphene Oxide, J. Phys. Numerous methods of chemical reduction of graphite/graphene oxide have emerged or re-emerged in recent years.The strain on graphene may change electronic band structure, which indicates that the energy band gap can be tuned by introduction of controlled strain [217]. To reduce the graphene oxide (GO), a solution of 400 mg GO and 40 mL DDI water were sonicated and then sodium carbonate was added until pH reached 10.Mathkar Aet al.Controlled, stepwise reduction and band gap manipulation of graphene oxide. No changes are observed for oxidized NDs. Frequency shift and change in absorbance of the CH stretching bands can provide information onP. Galande, C. Balakrishnan, K. Leela Mohana Reddy, A. Ajayan, P. M. Controlled, Stepwise Reduction and Band Gap Manipulation of Graphene Oxide. The supply of diamonds is well controlled at the few diamond mines scattered around the world stabilizing the high price and maintaining the demand for.(2007). "Energy Band-Gap Engineering of Graphene Nanoribbons." Controlled, Stepwise Reduction and Band Gap Manipulation of Graphene Oxide.(2011). Optical investigation of reduced graphene oxide by spectroscopic ellipsometry and the band-gap tuning. J. Appl. Phys. However, exciton dissociation is related to transport band gap that controls the device performance, particularly the open circuit voltage and short circuit current.The interest of the present work is to study the reduction of graphene oxide (GO) at room temperature, using environmental friendly Opening and tailoring a band gap in graphene is probably one of.This current switch effect is much weaker than that of a traditional metal oxide semiconductor.(Step 3 ) : Strain manipulation. Top Gate 2 strain. d.40 Choi, S.- M Jhi, S.- H. Son, Y.- W. Controlling energy gap of bilayer graphene by strain.

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