Non-resonant tip-enhanced Raman images of 4,4'-dimercaptostilbene on silver reveal that different vibrational resonances of the reporter are selectively enhanced at different sites on the metal substrate. Sequentially recorded images track molecular diffusion within the diffraction-limited laser spot which illuminates the substrate. In effect, the recorded time resolved (?t = 10 s) pixelated images (25 nm x 8 cm-1) broadcast molecule-local field interactions which take place on much finer scales.
Revised: April 27, 2016 |
Published: November 26, 2014
Citation
El-Khoury P.Z., T.W. Ueltschi, A.L. Mifflin, D. Hu, and W.P. Hess. 2014.Frequency Resolved Nanoscale Chemical Imaging of 4,4'-Dimercaptostilbene on Silver.Journal of Physical Chemistry C 118, no. 47:27525-27530.PNNL-SA-100249.doi:10.1021/jp509082c