Single-wall carbon nanotube chemical attachment at platinum electrodes |
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Authors: | Belinda I Rosario-Castro Marisabel Lebrón-Colón M Aulice Scibioh |
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Institution: | a Department of Chemistry and Center for Advanced Nanoscale Materials, University of Puerto Rico, Río Piedras Campus, PO Box 23346, San Juan 00931-3346, Puerto Rico b NASA John H. Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135, United States |
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Abstract: | Self-assembled monolayer (SAM) techniques were used to adsorb 4-aminothiophenol (4-ATP) on platinum electrodes in order to obtain an amino-terminated SAM as the base for the chemical attachment of single-wall carbon nanotubes (SWCNTs). A physico-chemical, morphological and electrochemical characterizations of SWCNTs attached onto the modified Pt electrodes was done by using reflection-absorption infrared spectroscopy (RAIR), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and cyclic voltammetry (CV) techniques. The SWNTs/4-ATP/Pt surface had regions of small, medium, and large thickness of carbon nanotubes with heights of 100-200 nm, 700 nm to 1.5 μm, and 1.0-3.0 μm, respectively. Cyclic voltammetries (CVs) in sulfuric acid demonstrated that attachment of SWNTs on 4-ATP/Pt is markedly stable, even after 30 potential cycles. CV in ruthenium hexamine was similar to bare Pt electrodes, suggesting that SWNTs assembly is similar to a closely packed microelectrode array. |
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Keywords: | Single-wall carbon nanotubes Self-assembled monolayers Platinum electrodes 4-Aminothiophenol Transmission electron microscopy Atomic force microscopy Raman spectroscopy |
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