Authors: Grégory Barbillon, Christophe Humbert, María Ujué González and José Miguel García-Martín
Article.
Nanomaterials 12, 4157 (2022)
Date: 24.NOV. 2022.
Doi: 10.1038/s42003-022-04147-5.
Abstract:
Herein, we investigate the chemical sensing by surface-enhanced Raman scattering regarding two templates of gold nanocolumns (vertical and tilted) manufactured by glancing angle deposition with magnetron sputtering. We selected this fabrication technique due to its advantages in terms of low-cost production and ease of implementation. These gold nanocolumnar structures allow producing a high density of strongly confined electric field spots within the nanogaps between the neighboring
nanocolumns. Thiophenolmolecules were used asmodel analytes since they have the principal property to adsorb well on gold surfaces. Regarding chemical sensing, the vertical (tilted) nanocolumnar templates showed a detection threshold limit of 10 nM (20 nM), an enhancement factor of 9.8 × 108 (4.8 × 108), and a high quality of adsorption with an adsorption constant Kads of 2.0 × 106 M-1 (1.8 × 106 M-1) for
thiophenolmolecules
