Chemical Interface Damping in Single Gold Nanorods and Its Near Elimination by Tip‐Specific Functionalization

Optical characterization of single plasmonic nanoparticles

“…The contributions to plasmon dephasing are usually expressed by writing the plasmon linewidth Γ as a sum of several plasmon damping terms according to: 33, 35, 42 …”

“…As interface damping can be small, single particle studies are ideally suited to determine its contribution to the overall linewidth. 35, 42 Fig. 12 shows an example where interface damping has been found for gold nanorods on a graphene substrate.…”

Linear and ultrafast nonlinear plasmonics of single nano-objects

“…In particular, Zijlstra et al recently investigated the effect of thiol coating on the SPR linewidth of gold nanorods by comparing the effect of no, tip-specific and full functionalizations on the same nanorods [98]. They found a linear relation between SPR broadening (with a Γ increase of ≈ 30 meV for full functionalization) and thiol density on nanorod surface.…”

Metal Nanoparticles for Microscopy and Spectroscopy

“…The functionalization of specific facets is therefore an effective avenue to improve the sensitivity of single-particle sensors. Protocols already exist to specifically functionalize the tips of nanorods [25] by introducing a surfactant in solution during the NP functionalization (Fig. 3.9).…”

“…Note that the difference in surfactant density between the sides and the tip is exaggerated. Reprinted with permission from [25], Copyright (2012) Wiley-VCH result in quenching of the fluorophores emission, and the energy is simply dissipated in the metal as heat. The balance between enhancement and quenching depends on the exact position and orientation of the fluorophore with respect to the NP, as well as on the NP size [28].…”