title: A highly sensitive, direct and label-free technique for Hg(2+) detection using Kelvin probe force microscopy.
abstract: For several decades, various nanomaterials have been used in a wide range of industrial fields, research areas, and commercial products. Among many nanomaterials, nano-sized mercury materials are one of the most widely used nanomaterials in real life. However, due to the high toxicity of Hg(2+), it is imperative to develop an effective and practical detection method for Hg(2+) to protect human health and environment. In this study, a highly sensitive, label-free method of detecting Hg(2+) that requires only a single drop of solution was developed. The detection mechanism is based on the different surface potential arising from Hg(2+) binding to mismatched thymine-thymine sequences, creating a very stable base pair. The surface potential is measured with Kelvin probe force microscopy (KPFM) to a molecular resolution. The developed method is capable of detecting 2 fmol of Hg(2+), which is 500 times more sensitive than previously reported techniques. Moreover, our method can selectively detect Hg(2+) and can also be applied to tap water and river water. This KPFM-based Hg(2+) detection method can be used as an early detection technique for practical applications.
authors.affiliation: Department of Mechanical Engineering, Korea University, Seoul 136-701, Korea.
authors.forename: Chanho
authors.initials: C
authors.lastname: Park
authors.forename: Kuewhan
authors.initials: K
authors.lastname: Jang
authors.forename: Sangmyung
authors.initials: S
authors.lastname: Lee
authors.forename: Juneseok
authors.initials: J
authors.lastname: You
authors.forename: Soyoung
authors.initials: S
authors.lastname: Lee
authors.forename: Hyunsoo
authors.initials: H
authors.lastname: Ha
authors.forename: Kyungtak
authors.initials: K
authors.lastname: Yun
authors.forename: Junseop
authors.initials: J
authors.lastname: Kim
authors.forename: Howon
authors.initials: H
authors.lastname: Lee
authors.forename: Jinsung
authors.initials: J
authors.lastname: Park
authors.forename: Sungsoo
authors.initials: S
authors.lastname: Na