Highly Sensitive Determination of Hg(II) Using Self-Assembled Monolayer of 4-Pyridineethanthiol on Gold Nanoparticles Modified-Glassy Carbon Electrode Pretreated by Exclusively Cathodic Polarization

Effects of Introducing 2-aminoethanethiol into 4-pyridineethanethiol Self-assembled Monolayer Applicable to Enhance Sensitivity of Hg(II) Electrochemical Analysis

“…These obtained values of charge suggest the formation of full surface coverage of monolayers on Au(111) [28]. Our previous results revealed that Au-NPs prepared under the experimental conditions are mainly Au(111) terrace having diameter of around 70 -80 nm as typically shown in inset [23]. In addition, on the voltammogram recorded for PET-SAM, a hump also appears at potential of -0.78 V, corresponding with weak lateral interactions of PET molecules in clusters [27].…”

“…The present work was prompted by our previous discovery that PET SAM functionalized Au-NPs on glassy carbon electrode (GCE) can be employed for detection of Hg(II) [23]. Hence, the purpose of this study is to further improve the advantage of this type of SAM-modified electrode in determination of Hg(II) at ultra concentrations.…”

“…The GCE was prepared by cutting available plate-shaped glassy carbon (Tokai GC-20 company, NY) into cylinder-shape and mounting into teflon tubes holder so that only a circular area of 0.071 cm 2 (roughness factor, ρ = 1.2) was exposed to the electrolyte. Electrochemical pretreatment of GCE used for further modification was described in elsewhere [23].…”