Electron-transfer characteristics of ferrocene attached to single-walled carbon nanotubes (SWCNT) arrays directly anchored to silicon(1 0 0) |
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Authors: | Jingxian Yu Martin R Johnston J Justin Gooding |
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Affiliation: | a School of Chemistry, Physics and Earth Sciences, Flinders University, Bedford Park, Adelaide, SA 5042, Australia b School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia |
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Abstract: | High-density, surface-mounted ferrocene has been prepared using covalent immobilisation of an alcohol substituted ferrocene derivative to a pre-assembled single-walled carbon nanotubes directly anchored to silicon(1 0 0) surface (SWCNTs-Si). The formation of these ferrocene-modified electrodes (Fc-SWCNTs-Si) has been followed using X-ray photoelectron spectroscopy and atomic force microscopy. Electrochemical results show the surface concentration of ferrocenemethanol molecules is 9.26 × 10−8 mol cm−2, which is about 500-1000 times greater than the experimentally measured coverage of ferrocene directly attached to flat Si(1 0 0) surfaces. The reversible one-electron wave of the ferrocene/ferrocenium couple was observed at 490 mV versus Ag+/Ag and the apparent rate constant of electron transfer, kapp, was 21 s−1. These results suggest these ferrocene-modified electrodes are excellent candidates for molecular memory devices. |
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Keywords: | Carbon nanotubes Silicon Ferrocene Electrochemistry Atomic force microscopy Surface attachment |
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