TY - JOUR
T1 - Reversible potential-induced structural changes of alkanethiol monolayers on gold surfaces
AU - Darwish, Nadim
AU - Eggers, Paul K.
AU - Ciampi, Simone
AU - Zhang, Yi
AU - Tong, Yujin
AU - Ye, Shen
AU - Paddon-Row, Michael N.
AU - Gooding, J. Justin
N1 - Funding Information:
N.D. acknowledges ARCNN for a travel fellowship to Hokkaido University-Japan where the IR measurements were performed. The Australian Research Council under the Discovery Projects funding scheme ( DP0556397 and CE0384243 ) is acknowledged. This work was partially supported by a Grant-in-Aid for Exploratory Research 21655074 and a Grant-in-Aid for Scientific Research on Innovative Areas “Coordination Program” 22108501 from MEXT, Japan .
PY - 2011/5
Y1 - 2011/5
N2 - Electrochemical impedance spectroscopy and in-situ IR spectroscopy were employed to investigate potential-induced structural changes, and associated ionic permeability, of alkanethiol self-assembled monolayers (SAMs) deposited on gold surfaces. SAMs terminated with hydroxyl or methyl groups were investigated. It is shown that both SAMs are highly permeable to ions once the dc potential is increased above a value of approximately + 500 mV vs Ag/AgCl in a 0.1 M HClO4 aqueous solution. At potentials more anodic than 500 mV, there exists a reversible change in the resistance and the capacitance of the SAMs. The change in the dielectric properties exhibits the same trend for both methyl and hydroxyl terminated SAMs and is accompanied with a structural change as confirmed using in-situ IR spectroscopy as a function of the applied potential.
AB - Electrochemical impedance spectroscopy and in-situ IR spectroscopy were employed to investigate potential-induced structural changes, and associated ionic permeability, of alkanethiol self-assembled monolayers (SAMs) deposited on gold surfaces. SAMs terminated with hydroxyl or methyl groups were investigated. It is shown that both SAMs are highly permeable to ions once the dc potential is increased above a value of approximately + 500 mV vs Ag/AgCl in a 0.1 M HClO4 aqueous solution. At potentials more anodic than 500 mV, there exists a reversible change in the resistance and the capacitance of the SAMs. The change in the dielectric properties exhibits the same trend for both methyl and hydroxyl terminated SAMs and is accompanied with a structural change as confirmed using in-situ IR spectroscopy as a function of the applied potential.
KW - Alkanethiols
KW - Electrochemical impedance spectroscopy
KW - In-situ infrared spectroscopy
KW - Ionic permeability
KW - Self-assembled monolayers
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U2 - 10.1016/j.elecom.2011.01.025
DO - 10.1016/j.elecom.2011.01.025
M3 - Article
AN - SCOPUS:79954616988
SN - 1388-2481
VL - 13
SP - 387
EP - 390
JO - Electrochemistry Communications
JF - Electrochemistry Communications
IS - 5
ER -