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Raman Spectroscopy of Di‐(2‐picolyl)amine on Gold Nanoparticles for Hg ( II ) Detection
Author(s) -
Ly Nguyen Hoang,
Joo SangWoo
Publication year - 2015
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.10054
Subject(s) - raman spectroscopy , chemistry , ion , raman scattering , analytical chemistry (journal) , spectroscopy , pyridine , colloidal gold , amine gas treating , nanoparticle , materials science , nanotechnology , organic chemistry , physics , quantum mechanics , optics
In an effort to develop a spectroscopic mercury ion sensor, the R aman spectral features of di‐(2‐picolyl)amine ( DPA ) on gold nanoparticles ( AuNPs ) were examined in the presence of various ions. The two bands at 1020 and 1060 cm −1 showed different intensities in the presence of Hg 2+ , whereas the other ions, Pb 2+ , Ni 2+ , NH 4 + , Na + , Mn 2+ , Mg 2+ , K + , Zn 2+ , Fe 2+ , Cd 2+ , Cu 2+ , Cr 3+ , Co 2+ , Fe 3+ , and Ca 2+ at the same concentrations of 100 μM did not produce such spectral changes. The band at 1060 cm −1 became stronger than that at 1020 cm −1 , only for Hg 2+ . These two bands may correspond to the ring‐breathing and trigonal ring‐breathing vibration of the two pyridine rings of DPA . The Hg ( II ) concentration‐dependent surface‐enhanced Raman scattering ( SERS) spectra indicated that the relative intensities of the two bands reversed above 10 μM. In addition to this noteworthy feature, the bands at 270 cm −1 , which may be ascribed to the Au—N stretching, show much higher intensities in the presence of Hg 2+ . Our R aman spectral analysis of DPA may be useful to discriminate the Hg 2+ ion above 10 μM using AuNPs on the basis of molecular vibrational spectroscopy.