TY - JOUR
T1 - Modulation of electrochemical property of carbon nanodot by post-chemical reductions
AU - Matsuoka, Ken ichi
AU - Fujita, Katsuhiko
N1 - Funding Information:
This work was financially supported by a Grant-in-Aid for Young Scientists (No. 24710119) from the Japan Society for the Promotion of Science (JSPS). The authors thank Dr. Yoshinori Miura (Center of Advanced Instrumental Analysis, Kyushu University) for the XPS measurements and fruitful discussions.
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/4/1
Y1 - 2015/4/1
N2 - 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.
AB - 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.
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U2 - 10.1016/j.colsurfa.2015.01.034
DO - 10.1016/j.colsurfa.2015.01.034
M3 - Article
AN - SCOPUS:84922670108
SN - 0927-7757
VL - 470
SP - 15
EP - 21
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
ER -