We present a facile method for the determination of the electromagnetic field enhancement of nanostructured TiN electrodes using surface-enhanced Raman spectroscopy. As a model system, TiN with partially collapsed nanotube structure obtained from the nitridation of TiO2 nanotube arrays was used. Using surface-enhanced Raman scattering (SERS) spectroscopy, the electro-magnetic field enhancement factors (EFs) of the substrate across the optical region were deter-mined. The non-surface binding SERS reporter group azidobenzol was chosen, for which con-tributions from the chemical enhancement effect can be minimized. Derived EFs correlated with the electronic absorption profile and reached 3.9 at 786 nm excitation. Near-field enhancement and far-field absorption simulated with rigorous coupled wave analysis showed good agreement with the experimental observations. From the calculations, the major optical activity of TiN was con-cluded to originate from collective localized plasmonic modes at ca. 700 nm arising from the specific nanostructure.

This project is open access and publicly accessible.


Collections in this community

Anonymous users may not see all communities or collections. Please log in to see your accessible communities and colletions.