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Arsenic Speciation on Silver Nanofilms by Surface-Enhanced Raman Spectroscopy by Mingwei Yang; Valery Liamtsau; Changjun Fan; Kelli L. Sylvers; Anthony J. McGoron; Guangliang Liu; Fengfu Fu; Yong Cai is a Chemistry article available to read on EtoBox.

What is Arsenic Speciation on Silver Nanofilms by Surface-Enhanced Raman Spectroscopy about?

Surface-enhanced Raman spectroscopy (SERS), as a nondestructive and fast detection technique, is a promising alternative approach for arsenic detection, particularly for in situ applications. SERS-based speciation analysis according to the fingerprint SERS signals of different arsenicals has the potential to provide a superior technique in species preservation over the conventional chromatographic separation methods, albeit with some difficulties due to the similarity in SERS patterns. In this study, we explored a novel SERS method for arsenic speciation by using the separation potential of the coffee ring effect on negatively charged silver nanofilms (AgNFs). Four arsenic species, including arsenite (As), arsenate (As), monomethylarsonic acid (MMA), and dimethylarsinic acid (DMA), were measured for fingerprint SERS signals in solution and on the films. Significant enhancement of SERS signals on the dried coffee ring stains by the AgNFs were observed except for As, and more importantly, arsenicals migrated varying distances during coffee ring development, promoting better speciation. Sodium dodecyl sulfate was then introduced into the droplet to reduce the droplet surface tension,

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Author

Mingwei Yang; Valery Liamtsau; Changjun Fan; Kelli L. Sylvers; Anthony J. McGoron; Guangliang Liu; Fengfu Fu; Yong Cai

Publisher

American Chemical Society (ACS)

Published

2019

Language

EN

Field

Chemistry (Physical Sciences)