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Nanodiamond (ND) powder was fluorinated through direct interaction of elemental fluorine with diamond surfaces and then aminated by chemical substitution reactions using the fluorinated-ND as an intermediate. The effects of the surface terminations on electrochemical properties of ND electrodes were investigated in aqueous solutions containing Fe (CN)63-/Fe(CN)64- and Fe3+/Fe2+ redox couples. The results showed that both redox reactions of Fe(CN)63-/Fe(CN)64- and Fe3+/Fe2+ were quasi-reversible on the pristine ND/solution interfaces. The redox kinetics of the Fe(CN)63-/Fe(CN)64- and Fe3+/Fe2+ systems became slower after fluorination on ND surface. The followed amino modification accelerated the electron exchange between the electrode and Fe(CN)63-/Fe(CN)64- but slowed the redox reaction of Fe3+/Fe2+ cations. The electrochemical activity of ND powder can be tunable via surface functionalizations.
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Wang et al. (2012) studied this question.
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