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Title: Studies on synthesis of reduced graphene oxide (RGO) via green route and its electrical property

Abstract

Highlights: • RGO-1 and RGO-2 were synthesized by green method using different phytoextracts. • M. indica L., S. tuberosum L. phytoextracts act as reducing and stabilizing agents. • Conjugated structure of graphene is established following partial reduction of GO. • Electrical conductivities of RGO-1 and RGO-2 are higher than GO. - Abstract: An environmentally friendly method has been applied for the preparation of reduced graphene oxide (RGO). This method was developed by using polyphenols that contained a phytoextract of Mangifera indica L. along with Solanum tuberosum L. as reducing agents since they are non-toxic and naturally available. The phytoextracts used in the production of RGO was set between 60 and 70 °C. Graphene oxide (GO) was prepared by modified Hummer’s method as reported in earlier findings. Structural and morphological studies demonstrate that the part of the oxygen functionalities in GO can be removed by following green reduction. Characterizations of the resulting product have been done by X-ray diffraction, FTIR, UV–vis and Raman spectroscopy. FESEM, TEM, EDX spectrum, TGA, DLS and Zeta potential measurements of the samples have also been carried out to study the morphological, thermal and surface charge characteristics. Electrical conductivity was also measured to check the extent ofmore » reduction of GO to RGO.« less

Authors:
 [1];  [2];  [1];  [2];  [3]; ; ;  [1];  [4];  [1]
  1. Department of Polymer Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700009 (India)
  2. (India)
  3. Department of Chemical and Biological Engineering, Industrial Membrane Research Institute, University of Ottawa, 161 Louis Pasteur St., Ottawa, Ontario K1 N 6N5 (Canada)
  4. Department of Chemistry, West Bengal State University, Barasat, Kolkata 700126 (India)
Publication Date:
OSTI Identifier:
22581572
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 79; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; CARBON OXIDES; ELECTRIC CONDUCTIVITY; FOURIER TRANSFORMATION; GRAPHENE; INFRARED SPECTRA; OPTICAL PROPERTIES; POLYPHENOLS; RAMAN SPECTROSCOPY; REDUCING AGENTS; REDUCTION; SOLANUM TUBEROSUM; SYNTHESIS; THERMAL GRAVIMETRIC ANALYSIS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION

Citation Formats

Sadhukhan, Sourav, Department of Chemistry, Budge Budge Institute of Technology, Nischintapur, Budge Budge, Kolkata 700137, Ghosh, Tapas Kumar, Department of Chemistry, West Bengal State University, Barasat, Kolkata 700126, Rana, Dipak, Roy, Indranil, Bhattacharyya, Amartya, Sarkar, Gunjan, Chakraborty, Mukut, and Chattopadhyay, Dipankar, E-mail: dipankar.chattopadhyay@gmail.com. Studies on synthesis of reduced graphene oxide (RGO) via green route and its electrical property. United States: N. p., 2016. Web. doi:10.1016/J.MATERRESBULL.2016.02.039.
Sadhukhan, Sourav, Department of Chemistry, Budge Budge Institute of Technology, Nischintapur, Budge Budge, Kolkata 700137, Ghosh, Tapas Kumar, Department of Chemistry, West Bengal State University, Barasat, Kolkata 700126, Rana, Dipak, Roy, Indranil, Bhattacharyya, Amartya, Sarkar, Gunjan, Chakraborty, Mukut, & Chattopadhyay, Dipankar, E-mail: dipankar.chattopadhyay@gmail.com. Studies on synthesis of reduced graphene oxide (RGO) via green route and its electrical property. United States. doi:10.1016/J.MATERRESBULL.2016.02.039.
Sadhukhan, Sourav, Department of Chemistry, Budge Budge Institute of Technology, Nischintapur, Budge Budge, Kolkata 700137, Ghosh, Tapas Kumar, Department of Chemistry, West Bengal State University, Barasat, Kolkata 700126, Rana, Dipak, Roy, Indranil, Bhattacharyya, Amartya, Sarkar, Gunjan, Chakraborty, Mukut, and Chattopadhyay, Dipankar, E-mail: dipankar.chattopadhyay@gmail.com. 2016. "Studies on synthesis of reduced graphene oxide (RGO) via green route and its electrical property". United States. doi:10.1016/J.MATERRESBULL.2016.02.039.
@article{osti_22581572,
title = {Studies on synthesis of reduced graphene oxide (RGO) via green route and its electrical property},
author = {Sadhukhan, Sourav and Department of Chemistry, Budge Budge Institute of Technology, Nischintapur, Budge Budge, Kolkata 700137 and Ghosh, Tapas Kumar and Department of Chemistry, West Bengal State University, Barasat, Kolkata 700126 and Rana, Dipak and Roy, Indranil and Bhattacharyya, Amartya and Sarkar, Gunjan and Chakraborty, Mukut and Chattopadhyay, Dipankar, E-mail: dipankar.chattopadhyay@gmail.com},
abstractNote = {Highlights: • RGO-1 and RGO-2 were synthesized by green method using different phytoextracts. • M. indica L., S. tuberosum L. phytoextracts act as reducing and stabilizing agents. • Conjugated structure of graphene is established following partial reduction of GO. • Electrical conductivities of RGO-1 and RGO-2 are higher than GO. - Abstract: An environmentally friendly method has been applied for the preparation of reduced graphene oxide (RGO). This method was developed by using polyphenols that contained a phytoextract of Mangifera indica L. along with Solanum tuberosum L. as reducing agents since they are non-toxic and naturally available. The phytoextracts used in the production of RGO was set between 60 and 70 °C. Graphene oxide (GO) was prepared by modified Hummer’s method as reported in earlier findings. Structural and morphological studies demonstrate that the part of the oxygen functionalities in GO can be removed by following green reduction. Characterizations of the resulting product have been done by X-ray diffraction, FTIR, UV–vis and Raman spectroscopy. FESEM, TEM, EDX spectrum, TGA, DLS and Zeta potential measurements of the samples have also been carried out to study the morphological, thermal and surface charge characteristics. Electrical conductivity was also measured to check the extent of reduction of GO to RGO.},
doi = {10.1016/J.MATERRESBULL.2016.02.039},
journal = {Materials Research Bulletin},
number = ,
volume = 79,
place = {United States},
year = 2016,
month = 7
}
  • Fe{sub 2.25}W{sub 0.75}O{sub 4}/reduced graphene oxide (RGO) composites were prepared for application of novel bifunctional photocatalyst via simple one-pot hydrothermal method, employing graphene oxide (GO), Na{sub 2}WO{sub 4}, FeSO{sub 4} and sodium dodecyl benzene sulfonate (SDBS) as the precursors. Transmission electron microscope (TEM) results indicate that the well-dispersed Fe{sub 2.25}W{sub 0.75}O{sub 4} nanoparticles were deposited on the surface of RGO sheets homogeneously. Magnetic characterization reveals that Fe{sub 2.25}W{sub 0.75}O{sub 4} and Fe{sub 2.25}W{sub 0.75}O{sub 4}/RGO show ferromagnetic behaviors. So this novel bifunctional photocatalyst could achieve magnetic separation and collection with the aid of external magnet. The composites exhibit enhanced photocatalyticmore » performance on degradation of methyl orange (MO) compared with pure Fe{sub 2.25}W{sub 0.75}O{sub 4} under low-power ultraviolet light irradiation due to the introduction of RGO. Moreover, this hybrid catalyst possesses long-term excellent photocatalytic performance due to its good thermal stability. This bifunctional photocatalyst, which combines magnetic property and excellent photocatalytic activity, would be a perfect candidate in applications of catalytic elimination of environmental pollutants and other areas. - Graphical abstract: Magnetically recyclable Fe{sub 2.25}W{sub 0.75}O{sub 4}/reduced graphene oxide nanocomposites with enhanced photocatalytic property Display Omitted - Highlights: ●Fe{sub 2.25}W{sub 0.75}O{sub 4} growth, deposition and GO reduction occurred simultaneously. ●Composite possessed ferromagnetic and enhanced photocatalytic properties. ●Composite is utilized as a magnetically separable and high-efficient photocatalyst. ●Photocatalyst showed good photocatalytic and thermal stability during cyclic use.« less
  • Graphene oxide (GO) and reduced graphene oxide (rGO) are important materials in a wide range of fields. The modified Hummers methods, for synthesizing GO, and subsequent thermal reduction to rGO, are often employed for production of rGO. However, the mechanism behinds these syntheses methods are still unclear. We present an in situ X-ray diffraction study of the synthesis of GO and thermal reduction of GO. The X-ray diffraction revealed that the Hummers method includes an intercalation state and finally formation of additional crystalline material. The formation of GO is observed during both the intercalation and the crystallization stage. During thermalmore » reduction of GO three stages were observed: GO, a disordered stage, and the rGO stage. The appearance of these stages depends on the heating ramp. The aim of this study is to provide deeper insight into the chemical and physical processes during the syntheses. - Graphical abstract: In situ X-ray diffraction results for of the modified Hummers synthesis and the thermal reduction of graphene oxide, revealing three stages for both syntheses as well as new GO diffraction peaks and unidentified crystalline material for the Hummers synthesis and a disordered stage for the thermal reduction of graphene oxide. Display Omitted - Highlights: • Hummers synthesis consists of three stages: dissolution, intercalation and crystal. • GO is produced early on during the synthesis and display new diffraction peaks. • An unidentified triclinic phase is observed for the Hummers synthesis. • Thermal reduction of GO display three stages: GO, a disordered stage and rGO. • In situ XRD indicate reformation of rGO even for fast heated thermal reduction.« less
  • Interest in graphene on its excellent mechanical, electrical, thermal and optical properties, it’s very high specific surface area, and our ability to influence these properties through chemical functionalization. Chemical reduction of graphene oxide is one of the main routes of preparation for large quantities of graphenes. Hydrazine hydrate used as reducing agent to prepare for the reduced graphene oxide (RGO). There are a number of methods for generating graphene and chemically modified graphene from natural graphite flakes, graphite derivative (such as graphite oxide) and graphite interaction compounds (i.e. expandable graphite). Here we review the use of colloidal suspensions of reducedmore » graphene oxide (RGO) with large scalable, and is adaptable to a wide variety of applications. The graphene oxide (GO) and the reduced material (RGO) were characterized by XRD, UV-Vis spectroscopy, Thermo-gravimetric analysis (TGA), Raman spectroscopy and Field emission Scanning electron microscopy (FESEM) etc.« less
  • We here report a scanning probe method to locally and directly research the electrical properties of vacuum-ultraviolet (VUV) reduced graphene oxide. The measured electrical conductivity of individual VUV-reduced GO (VUV-rGO) sheets by using conductive atomic force microscopy (CAFM) reached 0.20 S·m{sup −1} after 64 min irradiation, which was clearly enhanced compared with the pristine GO. According to the X-ray photoelectron spectroscopy results, the recovered conductivity of VUV-rGO could be ascribed to the partial elimination of oxygen-containing functional groups and the rapid reconstruction of the C=C bonds. Heterogeneously distributed low- and high-conductivity domains (with a diameter of tens of nanometer to ca. 500 nm)more » were found from current mapping of the VUV-rGO sheet. By applying photomask lithography, rGO regions were drawn into single GO sheet and were researched by CAFM. The in-plane lateral conductivity of rGO regions increased obviously compared with pristine GO regions.« less