Surface Enhanced Raman Spectroscopy (SERS) of Atmospheric Aerosol Particles

SERS has the potential to further Raman microspectroscopic characterization capabilities for atmospheric particles, as it enables detection of low concentration analytes through amplification of the Raman signal by the excitation of localized surface plasmon resonances. Raman signal from individual aerosol particle can be very low, so enhancement in the Raman spectra, specifically the fingerprint region will improve identification of functional groups. This project focuses on testing various nanoparticle synthesis and deposition methods to find a 'universal' SERS substrate that will effectively enhance the chemical species potentially present in aerosol particles.

Craig, R. L.G; Bondy, A. L.G; Ault, A.P.* Surface Enhanced Raman Spectroscopy (SERS) of Atmospheric Aerosol Particles: Enhanced Detection of Organic and Inorganic Species in Individual Particles. Analytical Chemistry, 2015, 87 (15), 7510–7514. 

Figure caption: (a) Optical image of aerosol particle, (highlighted in red) against SERS substrates, and mapped area (blue box). These particles were collected during a field study at the University of Michigan Biological Station Summer 2014. (b) Map of the aerosol particle (outlined in yellow dashes) showing the location of three different enhanced chemical species at 1022 cm-1 (green), 1370 cm-1(red), and 1480 cm-1 (blue). (c) Raman spectra accompanying the mapped intensities.