Few-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine

Alexandru R Biris,1 Stela Pruneanu,1 Florina Pogacean,1 Mihaela D Lazar,1 Gheorghe Borodi,1 Stefania Ardelean,1 Enkeleda Dervishi,2 Fumiya Watanabe,2 Alexandru S Biris2 1National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca, Romania; 2Center for Integrat...

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Autores principales:	Biris AR, Pruneanu S, Pogacean F, Lazar MD, Borodi G, Ardelean S, Dervishi E, Watanabe F, Biris AS
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2013
Materias:	Medicine (General) R5-920
Acceso en línea:	https://doaj.org/article/5bea31eacdaf4faa8d39c0572ac3d0b5
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spelling	oai:doaj.org-article:5bea31eacdaf4faa8d39c0572ac3d0b52021-12-02T02:16:48ZFew-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine1176-91141178-2013https://doaj.org/article/5bea31eacdaf4faa8d39c0572ac3d0b52013-04-01T00:00:00Zhttp://www.dovepress.com/few-layer-graphene-sheets-with-embedded-gold-nanoparticles-for-electro-a12733https://doaj.org/toc/1176-9114https://doaj.org/toc/1178-2013Alexandru R Biris,1 Stela Pruneanu,1 Florina Pogacean,1 Mihaela D Lazar,1 Gheorghe Borodi,1 Stefania Ardelean,1 Enkeleda Dervishi,2 Fumiya Watanabe,2 Alexandru S Biris2 1National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca, Romania; 2Center for Integrative Nanotechnology Sciences, University of Arkansas at Little Rock, Little Rock, AR, USA Abstract: This work describes the synthesis of few-layer graphene sheets embedded with various amounts of gold nanoparticles (Gr-Au-x) over an Aux/MgO catalytic system (where x = 1, 2, or 3 wt%). The sheet-like morphology of the Gr-Au-x nanostructures was confirmed by transmission electron microscopy and high resolution transmission electron microscopy, which also demonstrated that the number of layers within the sheets varied from two to seven. The sample with the highest percentage of gold nanoparticles embedded within the graphitic layers (Gr-Au-3) showed the highest degree of crystallinity. This distinct feature, along with the large number of edge-planes seen in high resolution transmission electron microscopic images, has a crucial effect on the electrocatalytic properties of this material. The reaction yields (40%–50%) and the final purity (96%–98%) of the Gr-Au-x composites were obtained by thermogravimetric analysis. The Gr-Au-x composites were used to modify platinum substrates and subsequently to detect adenine, one of the DNA bases. For the bare electrode, no oxidation signal was recorded. In contrast, all of the modified electrodes showed a strong electrocatalytic effect, and a clear peak for adenine oxidation was recorded at approximately +1.05 V. The highest increase in the electrochemical signal was obtained using a platinum/Gr-Au-3-modified electrode. In addition, this modified electrode had an exchange current density (I0, obtained from the Tafel plot) one order of magnitude higher than that of the bare platinum electrode, which also confirmed that the transfer of electrons took place more readily at the Gr-Au-3-modified electrode. Keywords: graphene, gold nanoparticles, chemical vapor deposition, oxidation of adenineBiris ARPruneanu SPogacean FLazar MDBorodi GArdelean SDervishi EWatanabe FBiris ASDove Medical PressarticleMedicine (General)R5-920ENInternational Journal of Nanomedicine, Vol 2013, Iss default, Pp 1429-1438 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine (General) R5-920
spellingShingle	Medicine (General) R5-920 Biris AR Pruneanu S Pogacean F Lazar MD Borodi G Ardelean S Dervishi E Watanabe F Biris AS Few-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine
description	Alexandru R Biris,1 Stela Pruneanu,1 Florina Pogacean,1 Mihaela D Lazar,1 Gheorghe Borodi,1 Stefania Ardelean,1 Enkeleda Dervishi,2 Fumiya Watanabe,2 Alexandru S Biris2 1National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca, Romania; 2Center for Integrative Nanotechnology Sciences, University of Arkansas at Little Rock, Little Rock, AR, USA Abstract: This work describes the synthesis of few-layer graphene sheets embedded with various amounts of gold nanoparticles (Gr-Au-x) over an Aux/MgO catalytic system (where x = 1, 2, or 3 wt%). The sheet-like morphology of the Gr-Au-x nanostructures was confirmed by transmission electron microscopy and high resolution transmission electron microscopy, which also demonstrated that the number of layers within the sheets varied from two to seven. The sample with the highest percentage of gold nanoparticles embedded within the graphitic layers (Gr-Au-3) showed the highest degree of crystallinity. This distinct feature, along with the large number of edge-planes seen in high resolution transmission electron microscopic images, has a crucial effect on the electrocatalytic properties of this material. The reaction yields (40%–50%) and the final purity (96%–98%) of the Gr-Au-x composites were obtained by thermogravimetric analysis. The Gr-Au-x composites were used to modify platinum substrates and subsequently to detect adenine, one of the DNA bases. For the bare electrode, no oxidation signal was recorded. In contrast, all of the modified electrodes showed a strong electrocatalytic effect, and a clear peak for adenine oxidation was recorded at approximately +1.05 V. The highest increase in the electrochemical signal was obtained using a platinum/Gr-Au-3-modified electrode. In addition, this modified electrode had an exchange current density (I0, obtained from the Tafel plot) one order of magnitude higher than that of the bare platinum electrode, which also confirmed that the transfer of electrons took place more readily at the Gr-Au-3-modified electrode. Keywords: graphene, gold nanoparticles, chemical vapor deposition, oxidation of adenine
format	article
author	Biris AR Pruneanu S Pogacean F Lazar MD Borodi G Ardelean S Dervishi E Watanabe F Biris AS
author_facet	Biris AR Pruneanu S Pogacean F Lazar MD Borodi G Ardelean S Dervishi E Watanabe F Biris AS
author_sort	Biris AR
title	Few-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine
title_short	Few-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine
title_full	Few-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine
title_fullStr	Few-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine
title_full_unstemmed	Few-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine
title_sort	few-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine
publisher	Dove Medical Press
publishDate	2013
url	https://doaj.org/article/5bea31eacdaf4faa8d39c0572ac3d0b5
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_version_	1718402597300207616

Few-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine

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