Premium
Electrochemical Studies on Self‐assembled Monolayer (SAM) Upon Exposure to Anionic Surfactants: PFOA, PFOS, SDS and SDBS
Author(s) -
Fang Cheng,
Megharaj Mallavarapu,
Naidu Ravi
Publication year - 2017
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201700108
Subject(s) - monolayer , quartz crystal microbalance , electrochemistry , perfluorooctanoic acid , cyclic voltammetry , aqueous solution , chemistry , inorganic chemistry , dielectric spectroscopy , nanoporous , chemical engineering , adsorption , electrode , organic chemistry , biochemistry , engineering
We investigate the interaction between anionic surfactants (AS) and a self‐assembled monolayer (SAM) using cyclic voltammetry (CV), electrochemical impedance spectrum (EIS) and electrochemical quartz crystal microbalance (EQCM). The AS include two common fluorosurfactants, which have been previously formulated in aqueous film‐forming foam (AFFF): perfluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), and two common detergents: sodium dodecyl sulphate (SDS) and sodium dodecyl benzenesulfonate (SDBS). The AS can re‐configure the SAM arrangement, particularly on nanoporous gold surface due to the high density of defects and pinholes of SAM, which results in changes to the electrochemical redox kinetics and interface capacitance of the SAM. Based on the experimental results, we hypothesis that AS insert and dope the pristine monolayer, which is evidenced with EQCM and EIS.