Basic Information
Abstract Number: 220-5    
Author Name: Fei Yan Affiliation: North Carolina Central University
Session Title: New Developments in Analytical Instrumentation and Software
Event Type: Sunday Poster
Event Title: Ultrasensitive SERS Nanoprobes for Selective Detection of Trivalent Metal Ions
Presider(s):   Start Time: ( Slot # 5 )
Date: Sunday, March 11th, 2012 Location: Valencia Room, W415
Keywords: Nanotechnology, Surface Enhanced Raman, Trace Analysis

Onabanjo, Janet ONorth Carolina Central University
Romeika, Jennifer MNorth Carolina Central University
Usman, Rukayat ANorth Carolina Central University

Abstract Content
Despite considerable research advances in trace metal analysis, rapid and accurate detection of environmentally and/or clinically important trivalent metal ions pose significant challenges to the scientific community. In this presentation, we report a unique surface-enhanced Raman scattering (SERS)-based sensing strategy, in which gold nanoparticles (Au NPs) were coupled with individual chelating ligands or mixed ligand systems for micromolar detection of trivalent metal ions such as aluminium, gallium, and iron. A seed-mediated growth approach to the synthesis of Au NPs of different colors was developed, and Au NPs with a longitudinal surface plasmon resonance that overlapped with the laser excitation wavelength (i.e., 785 nm) were shown to be the optimal SERS substrates. A strong linear correlation was found between metal ion concentrations ranging from 5-100 μM and the intensities at the characteristic Raman peaks corresponding to each specific metal-ligand interaction. The methodology offers great opportunities for the design of novel chemical and biological sensors.