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Sensors 2015, 15(5), 10088-10099; doi:10.3390/s150510088

Silver Nanoparticle-Enhanced Resonance Raman Sensor of Chromium(III) in Seawater Samples

Department of Chemistry, Soongsil University, Seoul 156-743, Korea
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Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 18 March 2015 / Revised: 21 April 2015 / Accepted: 24 April 2015 / Published: 29 April 2015
(This article belongs to the Section Chemical Sensors)
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Abstract

Tris(hydroxymethyl)aminomethane ethylenediaminetetraacetic acid (Tris-EDTA), upon binding Cr(III) in aqueous solutions at pH 8.0 on silver nanoparticles (AgNPs), was found to provide a sensitive and selective Raman marker band at ~563 cm−1, which can be ascribed to the metal-N band. UV-Vis absorption spectra also supported the aggregation and structural change of EDTA upon binding Cr(III). Only for Cr(III) concentrations above 500 nM, the band at ~563 cm−1 become strongly intensified in the surface-enhanced Raman scattering spectra. This band, due to the metal-EDTA complex, was not observed in the case of 50 mM of K+, Cd2+, Mg2+, Ca2+, Mn2+, Co2+, Na+, Cu2+, NH4+, Hg2+, Ni2+, Fe3+, Pb2+, Fe2+, and Zn2+ ions. Seawater samples containing K, Mg, Ca, and Na ion concentrations higher than 8 mM also showed the characteristic Raman band at ~563 cm−1 above 500 nM, validating our method. Our approach may be useful in detecting real water samples by means of AgNPs and Raman spectroscopy. View Full-Text
Keywords: Cr(III); EDTA; Raman spectroscopy; silver nanoparticles; seawater Cr(III); EDTA; Raman spectroscopy; silver nanoparticles; seawater
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MDPI and ACS Style

Ly, N.H.; Joo, S.-W. Silver Nanoparticle-Enhanced Resonance Raman Sensor of Chromium(III) in Seawater Samples. Sensors 2015, 15, 10088-10099.

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