| Title: | Surface Enhanced Raman Spectroscopy Enables Observations of Previously Undetectable Secondary Organic Aerosol Components at the Individual Particle Level |
| Author(s): | Craig RL; Bondy AL; Ault AP; |
| Address: | "daggerDepartment of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States. double daggerDepartment of Environmental Health Sciences, University of Michigan, Ann Arbor, Michigan 48109, United States" |
| DOI: | 10.1021/acs.analchem.5b01507 |
| ISSN/ISBN: | 1520-6882 (Electronic) 0003-2700 (Linking) |
| Abstract: | "The first use of surface enhanced Raman spectroscopy (SERS) to detect trace organic and/or inorganic species in ambient atmospheric aerosol particles is presented. This new analytical method provides direct, spectroscopic detection of species present at attogram to femtogram levels in individual submicrometer atmospheric particles. An array of spectral features resulting from organic functional groups in secondary organic aerosol (SOA) material were observed in individual particles impacted on silver nanoparticle-coated substrates. The results demonstrate the complexity of organic and inorganic species in SOA formed by oxidation of biogenic volatile organic compounds (BVOCs) at the single particle level. While SOA composition is frequently assumed to be homogeneous between and within individual particles, substantial particle-to-particle variability in SOA composition and changes on scales <1 mum were observed. The observations obtained with this new method demonstrate the power of SERS to probe difficult to detect inter- and intraparticle variability in ambient SOA particles" |
| Keywords: | "Aerosols/*chemistry Chemistry Techniques, Analytical/*methods Metal Nanoparticles/chemistry Particle Size Silver/chemistry *Spectrum Analysis, Raman Volatile Organic Compounds/*analysis/chemistry;" |
| Notes: | "MedlineCraig, Rebecca L Bondy, Amy L Ault, Andrew P eng Letter Research Support, Non-U.S. Gov't 2015/07/16 Anal Chem. 2015 Aug 4; 87(15):7510-4. doi: 10.1021/acs.analchem.5b01507. Epub 2015 Jul 23" |
