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• W3034684267 abstract "Covalently modifiedcarbon surfaces remain central to a number of applications. Surfacemodification is often achieved using aryldiazonium chemistry, whichhas become the gold standard for the functionalization of carbon-basedsurfaces. However, the higher reactivity and thus the lower stabilityof diazonium precursors at carbon interfaces have prompted a searchfor alternative chemistries. Diaryliodonium salts have emerged asstable alternatives to the conventional aryldiazonium precursors.In this contribution, we provide a detailed comparison between thetwo types of chemistries by carrying out electrochemical covalentgrafting of graphite substrates using nitrophenyl groups generatedfrom the corresponding aryldiazonium and diaryliodonium salts underidentical experimental conditions. The electrochemical process wasstudied using cyclic voltammetry, whereas the covalently grafted substrateswere characterized using a battery of surface analytical techniquesspanning multiple length scales. Analysis of the modified substratesusing Raman spectroscopy revealed that the efficiency of covalentgrafting is higher for iodonium chemistry than that for aryldiazoniumchemistry. This observation was further corroborated by detailed morphologicalcharacterization of the covalent films using atomic force microscopyand molecular-resolution scanning tunneling microscopy, which revealedhigher surface coverage for iodonium modified substrates. The chemicalcomposition of the films was probed using X-ray photoelectron spectroscopy.The detailed and systematic comparison presented here clearly demonstratesthat diaryliodonium chemistry presents a robust and reliable alternativeto the widely used aryldiazonium chemistry." @default.
• W3034684267 created "2020-06-19" @default.
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• W3034684267 date "2020-06-11" @default.
• W3034684267 modified "2023-10-07" @default.
• W3034684267 title "Covalent Functionalization of Carbon Surfaces: Diaryliodonium versus Aryldiazonium Chemistry" @default.
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• W3034684267 doi "https://doi.org/10.1021/acs.chemmater.0c01393" @default.
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