The role of the electrolyte on the SERS spectra of pyridine

SERS spectra of pyridine has been recorded on a silver electrode in a potential range from 0.0 to -1.20 V with a saline solution, pyridine / KCl (0.1M / 0.1M), by using the 514.5 nm exciting line by us [1]. Under these experimental conditions, the maximum intensity of the enhanced 8a and 9a bands is reached at -0.75 V and -1.20 V, respectively, being the 9a band what dominates the spectrum at negative electrode potential. Although this behavior has been explained under a resonant charge transfer mechanism, the nature of the electronic resonance processes involved in the enhancement of each band is different. The 8a band is enhanced due to an electronic excitation between the ground and excited charge transfer electronic state of the metal-adsorbate surface complex, while the activity of the 9a band is due to a plasmon-like excitation taking into account an overall electronic structure of small metal clusters [2] which is able to selectively modify the relative intensities of specific SERS band. We intend now to record pyridine SERS spectra under the same experimental conditions but varying only the type of electrolyte in order to check how it affects the relative intensities and vibrational wavenumbers of the bands as well as the electrode potential to which the enhanced bands reach the maximum intensity. Different electrolytes like KCl, NaCl, KBr, NaBr and Na2SO4, have been selected in such way that allows us to compare SERS spectra in which changes only the cation or the anion of the electrolyte. From the analysis of all these SERS spectra, it can be concluded that no significant wavenumbers shifts have been detected, while the relative intensities of the bands and the electrode potential to which the maximum intensity is reached are slightly modified. NaBr electrolyte requieres more negative electrode potential in order to enhance the 8a and 9a bands and to resolve the 12 and 1 pair. Acknowledgements We are grateful to the Spanish MINECO (CTQ2012-31846) and Junta de Andalucía (FQM-5156 and 6778), for financial support. References [1] J.F. Arenas, I. López Tocón, J.C. Otero, and J.I. Marcos, J. Phys. Chem. 100, 9254-9261 (1996). [2] J. Román-Pérez, I. López-Tocón, J.L. Castro, J. F. Arenas, J. Soto and J.C. Otero, Phys. Chem. Chem. Phys.17, 2326-2329 (2015).Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Mario Molina and the Threat of CFCs to the Ozone Layer in the Stratosphere

This poster for the Natural Sciences Poster Session at Parkland College describes the accomplishments of Mario Molina, who shares the Nobel Prize in chemistry with Paul J. Crutzen and F. Sherwood Rowland for discovering the harmful effects of chlorofluorocarbon gases in the stratosphere to the overall atmosphere and how they contribute to ozone depletion

Biodiesel: Tomorrow\u27s Fuel, Today\u27s Solution

Study of physical and chemical properties of biodiesel fuels derived from poultry and plant fats

Molding the flow of light through subwavelength devices

Patterning of subwavelength scale structures onto dielectrics allows engineering the local refractive index, dispersion and anisotropy of materials, thus opening new design possibilities which give unprecedented control of light shape in photonic integrated circuits. In this talk we will present an overview of our recent advances in subwavelength based devices of practical importance including fiber-chip couplers, ultra-broadband MMI devices, mode and polarization multiplexers and bragg deflectors.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Carlos J. Martínez Álava, La torre-palacio de los Varona: historia y patrimonio, Vitoria, Diputación Foral de Álava, 2009, 199 págs. [27,5 × 23,5]

Carlos J. Martínez Álava, La torre-palacio de los Varona: historia y patrimonio, Vitoria, Diputación Foral de Álava, 2009, 199 págs. [27,5 × 23,5