TY - JOUR
T1 - Biotin molecules on nitrogen-doped carbon nanotubes enhance the uniform anchoring and formation of Ag nanoparticles
AU - González, Viviana Jehová
AU - Gracia-Espino, Eduardo
AU - Morelos-Gómez, Aarón
AU - López-Urías, Florentino
AU - Terrones, Humberto
AU - Terrones, Mauricio
N1 - Funding Information:
M.T. thanks JST -Japan for funding the Research Center for Exotic NanoCarbons, under the Japanese regional Innovation Strategy Program by the Excellence. M.T. also thanks the Penn State Center for Nanoscale Science for seed grant entitled on 2-D Layered Materials. E.G.E. acknowledges support from the Artificial Leaf Project Umeå ( K&A Wallenberg foundation ) and the ÅForsk foundation (14-541). The authors are grateful to the Materials Research Institute at Penn State for the usage of characterization facilities. The theoretical simulations were partially performed on resources provided by the Swedish National Infrastructure for Computing (SNIC) at the High Performance Computing Center North (HPC2N).
Publisher Copyright:
© 2015 Elsevier Ltd. All rights reserved.
PY - 2015/7/1
Y1 - 2015/7/1
N2 - Abstract An efficient method for anchoring silver nanoparticles (Ag-NPs) on the surface of nitrogen-doped multi-walled carbon nanotubes (CNx-MWCNTs) is reported. The process involves the attachment of biotin molecules on the surface of CNx-MWCNTs (both, pristine and acid treated) that act as a reducing agent for AgNO3, thus generating an efficient and homogeneous coating of Ag-NPs (∼3 nm in diameter). The reduction of AgNO3 on either pristine CNx-MWCNTs or acid treated CNx-MWCNTs (without biotin) results in Ag-NPs of large diameters and size distribution, in addition to a low anchoring efficiency. We confirmed that the use of biotin substantially improves the Ag-NPs anchoring efficiency, especially on acid treated CNx-MWCNTs. In order to elucidate the mechanism whereby Ag-NPs strongly bind to the surface of CNx-MWCNTs, density functional theory (DFT) calculations were carried out. These revealed the existence of covalent bonds established between one side of the biotin molecule and the CNx-MWCNT surface through oxygen atoms, leaving accessible the exposed sulfur atoms at the other end, which further provided an excellent interaction with the Ag-NPs via S-Ag bonds. Finally, we demonstrate that these Ag-NPs coated CNx-MWCNTs could be used as efficient sensors of CS2.
AB - Abstract An efficient method for anchoring silver nanoparticles (Ag-NPs) on the surface of nitrogen-doped multi-walled carbon nanotubes (CNx-MWCNTs) is reported. The process involves the attachment of biotin molecules on the surface of CNx-MWCNTs (both, pristine and acid treated) that act as a reducing agent for AgNO3, thus generating an efficient and homogeneous coating of Ag-NPs (∼3 nm in diameter). The reduction of AgNO3 on either pristine CNx-MWCNTs or acid treated CNx-MWCNTs (without biotin) results in Ag-NPs of large diameters and size distribution, in addition to a low anchoring efficiency. We confirmed that the use of biotin substantially improves the Ag-NPs anchoring efficiency, especially on acid treated CNx-MWCNTs. In order to elucidate the mechanism whereby Ag-NPs strongly bind to the surface of CNx-MWCNTs, density functional theory (DFT) calculations were carried out. These revealed the existence of covalent bonds established between one side of the biotin molecule and the CNx-MWCNT surface through oxygen atoms, leaving accessible the exposed sulfur atoms at the other end, which further provided an excellent interaction with the Ag-NPs via S-Ag bonds. Finally, we demonstrate that these Ag-NPs coated CNx-MWCNTs could be used as efficient sensors of CS2.
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U2 - 10.1016/j.carbon.2015.02.046
DO - 10.1016/j.carbon.2015.02.046
M3 - Article
AN - SCOPUS:84926319482
SN - 0008-6223
VL - 88
SP - 51
EP - 59
JO - Carbon
JF - Carbon
M1 - 9714
ER -