Controlled synthesis of gold nanorod dimers with end-to-end configurations

Abstract

End-to-end gold nanorod dimers provide unique plasmonic hotspots with extremely large near-field enhancements in the gaps.

Two-Photon-Excited Single-Molecule Fluorescence Enhanced by Gold Nanorod Dimers

“…We monitored the assembly process by measuring the real-time absorption spectrum of the mixture to ensure most assembled structures to be the end-toend dimers. 54 A small amount (10 μL) of the assemblies of GNRs were deposited from the solution onto a clean cover glass slide. We stop the assembling by covering the slide with the assembly solution with another clean slide (see Figure S1b,d).…”

“…Therefore, the GNRs were linked by the molecular linker at the ends, leading to the end-to-end assembly of GNRs in the solution (see Figure S1a). We monitored the assembly process by measuring the real-time absorption spectrum of the mixture to ensure most assembled structures to be the end-to-end dimers . A small amount (10 μL) of the assemblies of GNRs were deposited from the solution onto a clean cover glass slide.…”

Wavelength-resolved near infra-red light induced free-radical polymerization

“…69 It is therefore plausible that a dominant redshifted scattering spectrum would suppress polymer conversion at longer wavelengths. However, determining the location of the overall absorption peak for the linked AuNR ensemble is difficult, given that a broad distribution of AuNR chains of various lengths and orientations are formed, 70 with each configuration characterized by unique absorption and scatter peak wavelengths.…”

Magnetoplasmonic gold nanorods for the sensitive and label-free detection of glutathione

“…The thiol groups in GSH preferentially adsorb onto Au tips due to strong gold-thiol interactions and a lower density of CTAB ligands compared to on the surface, enabling GNRs to selfassemble in an end-to-end conguration. 22,23 The formation of end-to-end assembly with such a low concentration of GSH as well indicates the reduced interaction of CTAB molecules and Au at the ends of the nanorods as compared to their sides. MCD spectroscopy (Jasco-1500 spectrophotometer) measures the differential absorption of le and right circularly polarized light under the inuence of a static magnetic eld parallel to the light propagation direction.…”

“…The thiol groups in GSH preferentially adsorb onto Au tips due to strong gold–thiol interactions and a lower density of CTAB ligands compared to on the surface, enabling GNRs to self-assemble in an end-to-end configuration. 22,23 The formation of end-to-end assembly with such a low concentration of GSH as well indicates the reduced interaction of CTAB molecules and Au at the ends of the nanorods as compared to their sides.…”