Facile synthesis of Pd@ graphene nanocomposites with enhanced catalytic activity towards Suzuki coupling reaction

M Khan, MR Shaik, SF Adil, M Kuniyil, M Ashraf… - Scientific …, 2020 - nature.com
Scientific RepoRtS, 2020nature.com
A facile and chemical specific method to synthesize highly reduced graphene oxide (HRG)
and Pd (HRG@ Pd) nanocomposite is presented. The HRG surfaces are tailored with amine
groups using 1-aminopyrene (1-AP) as functionalizing molecules. The aromatic rings of 1-
AP sit on the basal planes of HRG through π–π interactions, leaving amino groups outwards
(similar like self-assembled monolayer on 2D substrates). The amino groups provide the
chemically specific binding sites to the Pd nucleation which subsequently grow into …
Abstract
A facile and chemical specific method to synthesize highly reduced graphene oxide (HRG) and Pd (HRG@Pd) nanocomposite is presented. The HRG surfaces are tailored with amine groups using 1-aminopyrene (1-AP) as functionalizing molecules. The aromatic rings of 1-AP sit on the basal planes of HRG through π–π interactions, leaving amino groups outwards (similar like self-assembled monolayer on 2D substrates). The amino groups provide the chemically specific binding sites to the Pd nucleation which subsequently grow into nanoparticles. HRG@Pd nanocomposite demonstrated both uniform distribution of Pd nanoparticles on HRG surface as well as excellent physical stability and dispersibility. The surface functionalization was confirmed using, ultraviolet–visible (UV–Vis), Fourier transform infra-red and Raman spectroscopy. The size and distribution of Pd nanoparticles on the HRG and crystallinity were confirmed using high-resolution transmission electron microscopy and powder X-ray diffraction and X-ray photoelectron spectroscopy. The catalytic efficiency of highly reduced graphene oxide-pyrene-palladium nanocomposite (HRG-Py-Pd) is tested towards the Suzuki coupling reactions of various aryl halides. The kinetics of the catalytic reaction (Suzuki coupling) using HRG-Py-Pd nanocomposite was monitored using gas chromatography (GC).
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