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Published March 19, 2015 | Supplemental Material
Journal Article Open

Surface Enhanced Raman Spectroscopy of Organic Molecules on Magnetite (Fe_3O_4) Nanoparticles

Abstract

Surface-enhanced Raman spectroscopy (SERS) of species bound to environmentally relevant oxide nanoparticles is largely limited to organic molecules structurally related to catechol that facilitate a chemical enhancement of the Raman signal. Here, we report that magnetite (Fe_3O_4) nanoparticles provide a SERS signal from oxalic acid and cysteine via an electric field enhancement. Magnetite thus likely provides an oxide substrate for SERS study of any adsorbed organic molecule. This substrate combines benefits from both metal-based and chemical SERS by providing an oxide surface for studies of environmentally and catalytically relevant detailed chemical bonding information with fewer restrictions of molecular structure or binding mechanisms. Therefore, the magnetite-based SERS demonstrated here provides a new approach to establishing the surface interactions of environmentally relevant organic ligands and mineral surfaces.

Additional Information

© 2015 American Chemical Society. Received: January 7, 2015; Accepted: February 24, 2015; Published: February 24, 2015. The authors greatly appreciate discussions with Dr. Nicholas Borys. We thank Jennifer Soltis for acquiring TEM images of magnetite nanoparticles. We also wish to express our thanks to Patricia Fox for her assistance with ATR-FTIR data collection. This work was supported by the Laboratory Directed Research and Development program at Berkeley Lab, through the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award Number DE-AC02-05CH11231. Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract Number DE-AC02-05CH11231.

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