Redox properties of undoped 5 nm diamond nanoparticles

Physical Chemistry Chemical Physics : PCCP
Katherine B HoltJohn S Foord

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(NH(3))(6)(3+/2+) and Fe(CN)(6)(4-/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 sp(3) diamond core with a surface that has significant delocalised pi character due to unsatisfied surface atoms and C[double bond, length as m-dash]O bond formation. At the nanoscale surface properties of the particles dominate over those of the bulk, allowing ET to occur between...Continue Reading

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Citations

Apr 27, 2013·Nanoscale Research Letters·Mateusz WierzbickiAndré Chwalibog
Nov 27, 2014·Faraday Discussions·Thomas S VarleyKatherine B Holt
Sep 3, 2009·Journal of the American Chemical Society·Katherine B HoltEnrique J Millán-Barrios
Sep 25, 2012·Nanoscale·Tristan PetitPhilippe Bergonzo
Feb 19, 2010·Physical Chemistry Chemical Physics : PCCP·Katherine B Holt
Mar 20, 2010·Physical Chemistry Chemical Physics : PCCP·Daren J Caruana, Katherine B Holt
Apr 30, 2011·Physical Chemistry Chemical Physics : PCCP·Jean-Charles ArnaultMarc Chaigneau
Nov 26, 2010·Journal of Colloid and Interface Science·Yuejiang LiangAnke Krueger
Jun 3, 2015·Physical Chemistry Chemical Physics : PCCP·N O Mchedlov-PetrossyanE Ōsawa
Feb 12, 2019·Analytical Methods : Advancing Methods and Applications·Qun CaoB Jill Venton
Nov 17, 2020·Analytica Chimica Acta·Paulo A Raymundo-PereiraOrlando Fatibello-Filho
Dec 4, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Weng Siang YeapKian Ping Loh

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