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Open AccessArticle

Metal/Carbon Hybrid Nanostructures Produced from Plasma-Enhanced Chemical Vapor Deposition over Nafion-Supported Electrochemically Deposited Cobalt Nanoparticles

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Center of Excellence for Research in Engineering Materials, Deanship of Scientific Research, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia
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LISE Laboratory, Research Centre in Physics of Matter and Radiation (PMR), University of Namur, B-5000 Namur, Belgium
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Department of Mechanical Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia
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CEISAM: Chimie et Interdisciplinarité: Synthèse Analyse Modélisation, UMR 6230 CNRS—Université de Nantes, UFR Sciences et Techniques, Nantes CEDEX 3, France
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School of Chemical and Materials Engineering, National University of Sciences & Technology, Islamabad, Sector H-12, Islamabad 44000, Pakistan
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Institut des Matériaux Jean Rouxel, UMR 6502, 2 rue de la Houssinière, B.P. 32229, F-44322, Nantes CEDEX 3, France
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Author to whom correspondence should be addressed.
Materials 2018, 11(5), 687; https://doi.org/10.3390/ma11050687
Received: 5 April 2018 / Revised: 22 April 2018 / Accepted: 23 April 2018 / Published: 27 April 2018
(This article belongs to the Special Issue Supported Materials for Catalytic Application)
In this work, we report development of hybrid nanostructures of metal nanoparticles (NP) and carbon nanostructures with strong potential for catalysis, sensing, and energy applications. First, the etched silicon wafer substrates were passivated for subsequent electrochemical (EC) processing through grafting of nitro phenyl groups using para-nitrobenzene diazonium (PNBT). The X-ray photoelectron spectroscope (XPS) and atomic force microscope (AFM) studies confirmed presence of few layers. Cobalt-based nanoparticles were produced over dip or spin coated Nafion films under different EC reduction conditions, namely CoSO4 salt concentration (0.1 M, 1 mM), reduction time (5, 20 s), and indirect or direct EC reduction route. Extensive AFM examination revealed NP formation with different attributes (size, distribution) depending on electrochemistry conditions. While relatively large NP with >100 nm size and bimodal distribution were obtained after 20 s EC reduction in H3BO3 following Co2+ ion uptake, ultrafine NP (<10 nm) could be produced from EC reduction in CoSO4 and H3BO3 mixed solution with some tendency to form oxides. Different carbon nanostructures including few-walled or multiwalled carbon nanotubes (CNT) and carbon nanosheets were grown in a C2H2/NH3 plasma using the plasma-enhanced chemical vapor deposition technique. The devised processing routes enable size controlled synthesis of cobalt nanoparticles and metal/carbon hybrid nanostructures with unique microstructural features. View Full-Text
Keywords: cobalt nanoparticles; carbon nanotubes; Nafion membranes; nanocomposite films; electrochemical process; AFM cobalt nanoparticles; carbon nanotubes; Nafion membranes; nanocomposite films; electrochemical process; AFM
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MDPI and ACS Style

Islam, M.; Achour, A.; Saeed, K.; Boujtita, M.; Javed, S.; Djouadi, M.A. Metal/Carbon Hybrid Nanostructures Produced from Plasma-Enhanced Chemical Vapor Deposition over Nafion-Supported Electrochemically Deposited Cobalt Nanoparticles. Materials 2018, 11, 687.

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