Au Nanoparticle-Embedded Carbon Films for Electrochemical As(3+) Detection with High Sensitivity and Stability

Analytical Chemistry
Daiki KatoOsamu Niwa

Abstract

Au nanoparticle (AuNP)-embedded carbon films were formed with a one-step reproducible process by using unbalanced magnetron (UBM) cosputtering to make it possible to detect As(3+) in water. The sputtered Au components formed NPs (typically 5 nm in diameter) spontaneously in the carbon films, owing to the poor intermiscibility of Au with carbon. The surface contents of embedded AuNPs in the carbon film were widely controllable (Au = 13-21 at %) by regulating the target powers of Au and carbon individually. The obtained film had a flat surface (Ra = 0.1 nm) despite the fact the AuNPs were partially exposed at the surface. By anodic stripping voltammetry (ASV) As(3+) detection, a limit of detection of 0.55 ppb and linear dynamic range of 1-100 ppb were obtained with our electrode. These values meet the requirements imposed by international regulation. Moreover, our electrode structure realized good electrode stability for repetitive ASV measurements (relative standard deviation (RSD) = 11.7%, n = 15) because the partially embedded AuNP structures prevented the AuNPs from detaching from the surface. This result was achieved by the electrode recovery only by a potential scan from 0.1 to 1.5 V. Our electrodes can be stocked for a lon...Continue Reading

References

Sep 18, 2004·Analytical Chemistry·Andrew O SimmRichard G Compton
Oct 1, 2004·Analytical Chemistry·Xuan DaiRichard G Compton
Dec 18, 2004·Analytical and Bioanalytical Chemistry·Andrew O SimmRichard G Compton
Feb 27, 2007·Journal of Hazardous Materials·L Di Palma, R Mecozzi
Feb 4, 2010·Lab on a Chip·Zhihong NieGeorge M Whitesides
Oct 27, 2010·Analytical Chemistry·Mohammad Rezaur RahmanTakeo Ohsaka

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Citations

Sep 30, 2017·Chemical Society Reviews·Rasel DasSeeram Ramakrishna
Jul 18, 2020·The Analyst·Junling DuanJuewen Liu
Oct 20, 2020·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Osamu NiwaShunsuke Shiba

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