C18-Modified Metal-Colloid Substrates for Surface-Enhanced Raman Detection of Trace-Level Polycyclic Aromatic Hydrocarbons in Aqueous Solution
Journal Article
·
· Applied Spectroscopy
- University of Utah, Salt Lake City, UT (United States)
Metal colloids immobilized on a glass support substrate are modified with a self-assembled alkylsilane (C18) layer to promote adsorption of polycyclic aromatic hydrocarbons from aqueous solutions. Detection of these compounds from low concentration solutions is accomplished by using surface-enhanced Raman scattering (SERS). SERS spectra of pyrene adsorbed to C18-modified immobilized silver colloids are dominated by Raman bands that are not consistent with pyrene and indicate that pyrene undergoes a chemical reaction at the surface. The origins of this surface product are investigated, and it is determined that silver and oxygen are required to form the product, whose Raman spectrum is consistent with oxidation to a quinone. When a C18-modified gold-colloid substrate is used, Raman scattering consistent with unreacted pyrene is observed. Here, the adsorption and detection of pyrene adsorbed from low (2 ppb) concentration aqueous solutions onto C18-modified gold-colloid substrates is reported; naphthalene and phenanthrene are detected at ~5 ppb. Adsorption kinetics are rapid (<5 min), and the concentration-dependent SERS response is consistent with a Langmuir isotherm.
- Research Organization:
- University of Utah, Salt Lake City, UT (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
- Grant/Contract Number:
- FG03-93ER14333
- OSTI ID:
- 2481097
- Journal Information:
- Applied Spectroscopy, Journal Name: Applied Spectroscopy Journal Issue: 12 Vol. 58; ISSN 0003-7028
- Publisher:
- Society for Applied SpectroscopyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Surface-Enhanced Raman Spectroscopy Studies of Surfactant Adsorption to a Hydrophobic Interface
Surface-Enhanced Raman Spectroscopy Detection of Ionic Solutes by Surfactant-Mediated Adsorption to a Hydrophobic Surface
Characterization of Silane-Modified Immobilized Gold Colloids as a Substrate for Surface-Enhanced Raman Spectroscopy
Journal Article
·
Thu Jan 31 19:00:00 EST 2008
· Applied Spectroscopy
·
OSTI ID:2481090
Surface-Enhanced Raman Spectroscopy Detection of Ionic Solutes by Surfactant-Mediated Adsorption to a Hydrophobic Surface
Journal Article
·
Sun Jun 30 20:00:00 EDT 2013
· Applied Spectroscopy
·
OSTI ID:2481086
Characterization of Silane-Modified Immobilized Gold Colloids as a Substrate for Surface-Enhanced Raman Spectroscopy
Journal Article
·
Mon Jul 23 20:00:00 EDT 2001
· Analytical Chemistry
·
OSTI ID:2481105