Surface-Enhanced Raman Spectroscopy for Environmental Monitoring of Aerosols
Vasanthi Sivaprakasam, Matthew B. Hart
Abstract
exhibit SERS maxima for excitation in the 450-500 nm range for commercially available 40 nm spherical Ag nanoparticles (NPs) used in this study, which shifts to longer wavelengths with the addition of NaCl. Shifts in SERS and spontaneous Raman shifts were observed between aqueous and dry adenine, in agreement with the literature, demonstrating the utility of SERS to possibly study water uptake of aerosols. SERS is measured from MNP surface-coated PSL beads with an enhancement factor of 30 for 5 μm PSLs. Theoretical extrapolation demonstrates that the enhancement factor will increase for decreasing particle size with an estimated enhancement factor of 140 for 1 μm PSLs.
Topics & Concepts
Raman spectroscopyAerosolAnalytical Chemistry (journal)Surface-enhanced Raman spectroscopyNanoparticleDetection limitParticle (ecology)ChemistryParticle sizeSpectroscopyMaterials scienceRaman scatteringNanotechnologyChromatographyPhysical chemistryOrganic chemistryOpticsGeologyOceanographyPhysicsQuantum mechanicsGold and Silver Nanoparticles Synthesis and ApplicationsAir Quality and Health ImpactsAir Quality Monitoring and Forecasting