Electrochemical Studies on Self‐assembled Monolayer (SAM) Upon Exposure to Anionic Surfactants: PFOA, PFOS, SDS and SDBS. Issue 9 (16th June 2017)

• Record Type: Journal Article
• Authors: Fang, Cheng; Megharaj, Mallavarapu; Naidu, Ravi
• Is Part Of: Electroanalysis. Volume 29:Issue 9(2017)
• Page Start: 2155
• Page End: 2160
• Publication Date: 2017-06-16
• Subjects: self-assembled monolayer (SAM) -- perfluorooctanoic acid (PFOA) -- perfluorooctanesulfonic acid (PFOS) -- fluorosurfactant -- switch on-off -- electrochemical response -- EQCM -- EIS; Electrochemical analysis -- Periodicals; Chemistry, Analytical -- Periodicals; Electrochemistry -- Periodicals; 543.4
• DOI: 10.1002/elan.201700108
• Languages: English
• ISSNs: 1040-0397

Abstract

Abstract: 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. Abstract :