Modulation of electrochemical property of carbon nanodot by post-chemical reductions

Ken ichi Matsuoka, Katsuhiko Fujita

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Abstract

Influences of chemical reductions on the electrochemical properties of carbon nanodots (CNDs) were investigated. Sequential electron transfer reactions involving CNDs and several electrochromic molecules were analyzed by titration method to deduce electron accepting capabilities and upper-limit reduction potentials. CNDs prepared by alkali-assisted electrochemical oxidation of graphite were reduced by either sodium borohydride or hydrazine to obtain chemically reduced CNDs. Titration analysis of the electron transfer reactions involving methylviologen cation radicals and CNDs revealed that electron uptake per unit weight of CND increased nearly 30% after chemical reductions. Furthermore, detailed analyses of electron discharge processes involving the electron-filled CNDs and several leuco dyes provided fine estimation of upper-limit reduction potential and evidence of reduction potential shifts of CNDs to negative level by chemical reductions.

Original languageEnglish
Pages (from-to)15-21
Number of pages7
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume470
DOIs
Publication statusPublished - Apr 1 2015

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All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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