Hydrothermal core-shell carbon nanoparticle films

Thinning the shell leads to dramatic pH response

F. Xia, M. Pan, S. Mu, Y. Xiong, K.J. Edler, I. Idini, M.D. Jones, S.C. Tsang, F. Marken

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Carbon nanoparticles with phenylsulfonate negative surface functionality (Emperor 2000, Cabot Corp.) are coated with positive chitosan followed by hydrothermal carbonization to give highly pH-responsive core-shell nanocarbon composite materials. With optimised core-shell ratio (resulting in an average shell thickness of ca. 4 nm, estimated from SANS data) modified electrodes exhibit highly pH-sensitive resistance, capacitance, and Faradaic electron transfer responses (solution based, covalently bound, or hydrothermally embedded). A shell "double layer exclusion" mechanism is discussed to explain the observed pH switching effects. Based on this mechanism, a broader range of future applications of responsive core-shell nanoparticles are envisaged.
Original languageEnglish
Pages (from-to)15860-15865
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume14
Issue number45
DOIs
Publication statusPublished - 5 Dec 2012

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Carbon
Nanoparticles
nanoparticles
carbon
Carbonization
Chitosan
Capacitance
carbonization
exclusion
Electrodes
Electrons
electron transfer
Composite materials
capacitance
composite materials
electrodes

Cite this

Hydrothermal core-shell carbon nanoparticle films : Thinning the shell leads to dramatic pH response. / Xia, F.; Pan, M.; Mu, S.; Xiong, Y.; Edler, K.J.; Idini, I.; Jones, M.D.; Tsang, S.C.; Marken, F.

In: Physical Chemistry Chemical Physics, Vol. 14, No. 45, 05.12.2012, p. 15860-15865.

Research output: Contribution to journalArticle

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