Adsorption of toluene‐3,4‐dithiol on silver islands investigated by surface‐enhanced Raman spectroscopy

Abstract

The adsorbtion of toluene-3,4-dithiol (TDT) molecules on Ag islands was investigated with surface-enhanced Raman spectroscopy (SERS). The SERS spectrum was compared with the ordinary Raman spectrum of TDT, and differences in spectral features were discussed with the support of density functional theory calculations. The disappearance of all the S-H-related bands in the SERS spectrum indicates that TDT adsorbs on Ag via both thiol groups, as supported by the emergence of a weak band at 223 cm −1 attributed to Ag-S stretching. Signatures of Ag-S-C complexes suggest that the adsorption is partially disordered. The observation of all the vibrational modes involving the methyl group indicates that the methyl group is exposed, offering new functionalization possibilities of the surface.

Characterization of sulfur/carbon copolymer cathodes for Li–S batteries: a combined experimental andab initioRaman spectroscopy study

“…1a and b is the activity at ∼450 cm −1 . This peak corresponds to a CH 3 vibration in the propyl group in 1,3-diisopropylbenzene 41 and is much less intensive in 1,3-diisopropenylbenzene spectrum (see ESI † ).…”

Adsorbate‐Induced Modifications in the Optical Response of the Si(553)–Au Surface

“…In a Raman and DFT study of the adsorption of TDT on Ag islands, [ 46 ] a broad band was calculated at about 2550 cm −1 . This feature was related to several components of the S–H band of the thiol group with a broadening and shift toward lower energies due to the increased amount of dimerized molecules in the TDT molecule from possible exposure to ambient light.…”