Silver Nanoparticle-Enhanced Resonance Raman Sensor of Chromium(III) in Seawater Samples
- Authors
- Nguyen Hoang Ly; Joo, Sang-Woo
- Issue Date
- May-2015
- Publisher
- MDPI AG
- Keywords
- Cr(III); EDTA; Raman spectroscopy; silver nanoparticles; seawater
- Citation
- SENSORS, v.15, no.5, pp.10088 - 10099
- Journal Title
- SENSORS
- Volume
- 15
- Number
- 5
- Start Page
- 10088
- End Page
- 10099
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/8747
- DOI
- 10.3390/s150510088
- ISSN
- 1424-8220
- 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 similar to 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 similar to 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 M 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 similar to 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.
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