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• W2058445039 abstract "This paper demonstrates the promoting effects of 5 nm undoped detonation diamond nanoparticles on redox reactions in solution. An enhancement in faradaic current for the redox couples Ru(NH3)63+/2+ and Fe(CN)64–/3– was observed for a gold electrode modified with a drop-coated layer of nanodiamond (ND), in comparison to the bare gold electrode. The ND layer was also found to promote oxygen reduction. Surface modification of the ND powders by heating in air or in a hydrogen flow resulted in oxygenated and hydrogenated forms of the ND, respectively. Oxygenated ND was found to exhibit the greatest electrochemical activity and hydrogenated ND the least. Differential pulse voltammetry of electrode-immobilised ND layers in the absence of solution redox species revealed oxidation and reduction peaks that could be attributed to direct electron transfer (ET) reactions of the ND particles themselves. It is hypothesised that ND consists of an insulating sp3diamond core with a surface that has significant delocalised π character due to unsatisfied surface atoms and CO bond formation. At the nanoscale surface properties of the particles dominate over those of the bulk, allowing ET to occur between these essentially insulating particles and a redox species in solution or an underlying electrode. We speculate that reversible reduction of the ND may occur via electron injection into available surface states at well-defined reduction potentials and allow the ND particles to act as a source and sink of electrons for the promotion of solution redox reactions." @default.
• W2058445039 created "2016-06-24" @default.
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• W2058445039 date "2008-01-01" @default.
• W2058445039 modified "2023-09-26" @default.
• W2058445039 title "Redox properties of undoped 5 nm diamond nanoparticles" @default.
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• W2058445039 doi "https://doi.org/10.1039/b711049a" @default.
• W2058445039 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18213416" @default.
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