INQUIMAE   12526
INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
artículos
Título:
Incident Wavelength Resolved Resonant SERS on Au Sphere Segment Void (SSV) Arrays
Autor/es:
N. TOGNALLI,; A. FAINSTEIN; CALVO EJ,; ABDELSALAM, M.; BARTLETT, P.N.
Revista:
JOURNAL OF PHYSICAL CHEMISTRY C
Editorial:
AMER CHEMICAL SOC
Referencias:
Lugar: Washington; Año: 2012 vol. 116 p. 3414 - 3420
ISSN:
1932-7447
Resumen:
Sphere segment void (SSV) arrays allow the reproducible
engineering of plasmon-polariton modes from the near-infrared
to the ultraviolet through the tuning of the void height and diameter.
The wavelength dependence of surface-enhanced Raman scattering
(SERS) can then in principle be controlled by selecting these
parameters. Using 4-mercaptopyridine as a covalently bonded
nonresonant molecular probe, we report a detailed study of such
wavelength dependence of SERS in Au SSV arrays as a function of void
diameter and height. We conclude that the SERS mechanism on SSV
arrays depends on the plasmonic properties of the substrates and also
that additional effects contribute significantly to the observed
enhancement including a chemical contribution related to the molecular probe and a nanostructuring induced surface plasmon
localization existent for the smaller cavity dimensions.