title: Synthesis and characterization of gold graphene composite with dyes as model substrates for decolorization: a surfactant free laser ablation approach.
abstract: A facile surfactant free laser ablation mediated synthesis (LAMS) of gold-graphene composite is reported here. The material was characterized using transmission electron microscopy, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, powdered X-ray diffraction, Raman spectroscopy, Zeta potential measurements and UV-Visible spectroscopic techniques. The as-synthesized gold-graphene composite was effectively utilized as catalyst for decolorization of 4 important textile and laser dyes. The integration of gold nanoparticles (AuNPs) with high surface area graphene has enhanced the catalytic activity of AuNPs. This enhanced activity is attributed to the synergistic interplay of pristine gold's electronic relay and π-π stacking of graphene with the dyes. This is evident when the Rhodamine B (RB) reduction rate of the composite is nearly twice faster than that of commercial citrate capped AuNPs of similar size. In case of Methylene blue (MB) the rate of reduction is 17,000 times faster than uncatalyzed reaction. This synthetic method opens door to laser ablation based fabrication of metal catalysts on graphene for improved performance without the aid of linkers and surfactants.
authors: Department of Chemistry, Sri Sathya Sai Institute of Higher Learning, Prashanthi Nilayam, 515134, India.
authors: R S
authors: RS
authors: Sai Siddhardha
authors: Department of Physics and Nanoscience, Sri Sathya Sai Institute of Higher Learning, Prashanthi Nilayam, 515134, India.
authors: V
authors: V
authors: Lakshman Kumar
authors: Alternative Energy and Nanotechnology Laboratory (AENL), Nano Functional Materials Technology Centre (NFMTC), Department of Physics, Indian Institute of Technology Madras (IITM), Chennai 600036, India.
authors: Adarsh
authors: A
authors: Kaniyoor
authors: Department of Physics and Nanoscience, Sri Sathya Sai Institute of Higher Learning, Prashanthi Nilayam, 515134, India.
authors: V
authors: V
authors: Sai Muthukumar
authors: Alternative Energy and Nanotechnology Laboratory (AENL), Nano Functional Materials Technology Centre (NFMTC), Department of Physics, Indian Institute of Technology Madras (IITM), Chennai 600036, India.
authors: S
authors: S
authors: Ramaprabhu
authors: Department of Physics and Astronomy, Clemson Nanomaterials Center, Clemson University, Clemson, SC 29634, United States; Center for Optical Materials Science & Engineering Technologies, Clemson University, Clemson, SC 29634, United States.
authors: Ramakrishna
authors: R
authors: Podila
authors: Department of Physics and Astronomy, Clemson Nanomaterials Center, Clemson University, Clemson, SC 29634, United States; Center for Optical Materials Science & Engineering Technologies, Clemson University, Clemson, SC 29634, United States.
authors: A M
authors: AM
authors: Rao
authors: Department of Chemistry, Sri Sathya Sai Institute of Higher Learning, Prashanthi Nilayam, 515134, India. Electronic address: rsaisathish@sssihl.edu.in.
authors: Sai Sathish
authors: SS
authors: Ramamurthy
mesh_terms: D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry* / Q000302:isolation & purification; D006046:Gold / Q000737:chemistry*; D006108:Graphite / Q000138:chemical synthesis / Q000737:chemistry*; D053685:Laser Therapy; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction
chemical_list: D004396:Coloring Agents; D006046:Gold; D006108:Graphite
keywords: Catalysis; Decolorization; Dye reduction; Gold nanoparticles; Graphene; Laser ablation