Synthesis and Characterization of 2D-Graphene Oxide-Metal Hybrid Systems with Increased Solubility
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.259
Synthesis and Characterization of 2D-Graphene Oxide-Metal Hybrid Systems with Increased Solubility Hadi Kelani1, Shelby Weatherbee1, Stephen Blama1 and Mary Sajini Devadas1* 1
Department of Chemistry, Towson University 8000 York Road, Towson, MD 21252, U.S.A.
*Corresponding Author Email: [email protected]
ABSTRACT
Graphene oxide serves as a precursor to various technologies, which include batteries, biosensors, solar cells, and supercapacitors. Gold nanoparticles exhibit excellent electrochemical and photophysical properties, allowing for electronic absorption and the ability to absorb light energy at the plasmonic wavelength. Palladium nanoparticles are highly sensitive and functional in room temperature, making it an ideal metal for catalytic applications. We report the synthesis of functional graphene oxide from graphite flakes followed by the insertion of gold and palladium nanoparticles through an oleylamine ligand. In this report, the fermi level of graphene oxide (GOx), gold-graphene oxide (Au-GOx), and palladium-graphene oxide (Pd-GOx) was shown to be effectively controlled. Additionally, each system showed complete solubility in ethanol and in the case of Au-GOx, enhanced solubility was seen in tetrahydrofuran as well.
INTRODUCTION Graphene oxide (GOx) serves as a precursor to applications such as batteries, biosensors, solar cells, and support systems for metal catalysts [1]. Graphene oxide consists of an increased number of oxygen-containing functional groups, ultimately functionalizing the system. The carboxyl groups aid in solvent solubility, preserve graphene properties, and prevent agglomeration [2]. In this experiment, GOx was synthesized to support a metal-complex. The primary metals used in this paper were gold and palladium.
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Gold nanoparticles exhibit excellent electrochemical and photophysical properties, allowing for electronic absorption and the ability to absorb light energy at the plasmonic wavelength [3]. Gold nanoparticles inserted on the surface of GOx generate a localized surface plasmon resonance, which is the result of the oscillation of conduction band electrons in the gold nanoparticles excited by light [4]. Applications for Au-GOx hybrid systems include nerve agent sensing, catalysis, biomedical probes for various diseases, and removal of cancer cells [5-7]. Palladium nanoparticles are highly selective, sensitive, and functional in room temperature [8, 9]. Palladium is also resistant to oxidation and consists of a high surface area to volume ratio, making it an ideal metal for catalytic applications [10]. These characteristics allow the nanoparticle to be a cheap and stable alternative transition metal in the catalysis of Suzuki cross coupling reactions. A Suzuki cross
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