Flexible Graphene Films via the Filtration of Water-Soluble Noncovalent Functionalized Graphene Sheets
Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China. Journal of the American Chemical Society
(Impact Factor: 12.11).
06/2008; 130(18):5856-7. DOI: 10.1021/ja800745y
Flexible graphene films were prepared by the filtration of water-soluble noncovalently functionalized graphene sheets with pyrenebutyrate. The work presented here will not only open a new way for preparing water-soluble graphene dispersions but also provide a general route for fabricating conducting films based on graphene.
Available from: Yuchao Li
- "Noncovalent functionalization can be achieved by polymer wrapping, adsorption of surfactants or small molecules via p–p stacking interactions, preventing the generation of surface defects and disruption of electron conjugation of graphene    . Thus noncovalent functionalization of GO layers has attracted considerable attention in recent years          . For example, Lomeda et al. used sodium dodecylbenzenesulfonate (SDBS) surfactant to wrap reduced graphene sheets followed by treating with aryl diazonium salts . "
- "Graphene oxide (GO) was synthesized from natural graphite by a modified Hummers' method  . In a typical synthesis of DPtPd/rGO hybrid, 1.0 mL GO suspension (1 mg mL À1 ) and 0.02 g Pluronic F127 were ultrasonically dispersed, followed by the addition of 0.9 mL K 2 PtCl 4 (40 mM) and 0.1 mL Na 2 PdCl 4 (40 mM) aqueous solutions. "
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ABSTRACT: Rationally designing the composition and structure of metallic nanoparticles/reduced graphene oxide hybrids is highly important for synthesizing active electrocatalysts. Herein, we report a one-step method to efficiently synthesize dendritic bimetallic PtPd nanoparticles on reduced graphene oxide (DPtPd/rGO) in aqueous solution at room temperature. The proposed synthesis is performed by a simple sonication treatment of an aqueous reactive mixture containing K2PtCl4, Na2PdCl4, Pluronic F127 and ascorbic acid. This method is greatly simplified compared to the traditional multi-step-seeded growth or other hydrothermal syntheses. The as-made DPtPd/rGO hybrid consists in spatially and locally separated dendritic PtPd nanoparticles well-dispersed on the surface of rGO and is an active catalyst for methanol oxidation and oxygen reduction reactions. The proposed strategy is an effective method to directly fabricate metals/rGO hybrids for electrocatalytic applications.
Available from: Prasanta Kumar Sahoo
- "The characteristic bands of GO are observed at 3402 cm À1 (O-H stretching vibration), 1737 cm À1 (C=O stretching vibration of the COOH groups),1402 cm À1 (O-H deformation vibration of tertiary C-OH), 1224 cm À1 (C–O stretching vibration of phenolic C-OH), and 1051 cm À1 (C–O stretching vibrations of epoxy groups). The band at 1623 cm À1 is related to the vibration of the adsorbed water molecules or skeletal vibrations of unoxidized C-C bonding . Nearly all of the characteristic bands, which are related to oxygenic functional groups, almost vanished in the FTIR spectra of the RGO/Au nanocomposite, indicating in the reduction method GO by being transformed into RGO. "
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ABSTRACT: A facile, one-step solvothermal approach has been utilized for the synthesis of a reduced graphene oxide/Au nanocomposite (RGO/Au) material. Deposition of Au nanoparticles (AuNPs) on the surface of reduced graphene oxide sheets has been realized by a simple reduction of Au precursors and graphite oxide (GO) in ethylene glycol (EG), without using any additional reductants and surfactants. The morphology of the RGO/Au nanocomposite was thoroughly examined by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and high-resolution transmission electron microscopy (HRTEM). The morphology of the RGO/Au nanocomposite was characterized by HRTEM and 20 nm was the average size of the AuNPs obtained. The performance of the RGO/Au nanocomposite has been investigated in the application of the Hg determination at the trace/ultra trace level using differential pulse anodic stripping voltammetry. The composite material was also applied for the determination of p-methoxy phenol (PMP) and, most importantly, it was observed that the material was suitable for the decomposition of PMP by the electrochemical oxidation process. The three sigma detection limits for Hg2+ and PMP were obtained as 0.25 μgL-1 and 0.64 μM, respectively. The applicability of the RGO/Au nanocomposite was further extended to determine Hg2+ in soil samples. Chronoamperometric tests were carried out to investigate the performance of modified and unmodified electrodes in the decomposition of PMP by the electrochemical oxidation route.
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