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Article Dans Une Revue Journal of Materials Science Année : 2018

Localised detection of thiophenol with gold nanotriangles highly structured as honeycombs by nonlinear sum frequency generation spectroscopy

T. Noblet
B. Busson
A. Tadjeddine
Christophe Humbert

Résumé

Gold nanotriangles structured as honeycombs and fabricated by nanosphere lithography on a gold film are functionalized by thiophenol molecules in order to be used as plasmonic sensors in nonlinear optical sum-frequency generation (SFG) spectroscopy. The monitoring and the characterization of the surface optical properties are performed by UV-Visible differential reflectance spectroscopy showing an absorbance maximum located at 540 nm for p-and s-polarisation beams. SFG spectroscopy proves to be effective for thiophenol detection in ssp-polarisation scheme while the molecular SFG signal disappears in ppp-configuration due to the strong s-d interband contribution of gold. However, in ssp-configuration, the vibration modes of thiophe-nol molecules at 3050 and 3071 cm −1 are yet observed thanks to the excitation of a transversal plasmon mode by the incident visible laser beam, whereas they are usually very difficult to distinguish by Surface Enhanced Raman Scattering (SERS) and other vibrational optical probes.
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Dates et versions

hal-03006908 , version 1 (16-11-2020)

Identifiants

Citer

G. Barbillon, T. Noblet, B. Busson, A. Tadjeddine, Christophe Humbert. Localised detection of thiophenol with gold nanotriangles highly structured as honeycombs by nonlinear sum frequency generation spectroscopy. Journal of Materials Science, 2018, 53 (6), pp.4554-4562. ⟨10.1007/s10853-017-1832-9⟩. ⟨hal-03006908⟩
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