TY - JOUR
T1 - Hydrothermal core-shell carbon nanoparticle films
T2 - Thinning the shell leads to dramatic pH response
AU - Xia, F.
AU - Pan, M.
AU - Mu, S.
AU - Xiong, Y.
AU - Edler, K.J.
AU - Idini, I.
AU - Jones, M.D.
AU - Tsang, S.C.
AU - Marken, F.
PY - 2012/12/5
Y1 - 2012/12/5
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84868515643&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1039/c2cp42659e
U2 - 10.1039/c2cp42659e
DO - 10.1039/c2cp42659e
M3 - Article
AN - SCOPUS:84868515643
SN - 1463-9076
VL - 14
SP - 15860
EP - 15865
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
IS - 45
ER -