Surface Modification of Gold Nanorods by Grafting Fluorene‐Based Conjugated Copolymers Containing Thiol‐Pendants

Abstract

Two conjugated surfactants of monomer TF and polymer PTF with pendant thiol groups are synthesized for surface modifications of gold nanorods (GNRs). Cetyltrimethylammonium bromide (CTAB)‐GNRs (without surface‐modification) in aqueous solutions are prepared, and the original CTAB surfactant is replaced with TF and PTF due to their thiol‐gold grafting reactions. Surface‐modified TF‐GNRs and PTF‐GNRs in THF are obtained. UV‐visible spectra provide the grafting evidence of TF and PTF. Compared with TF‐GNRs, the PTF‐GNRs show better solubility and stability against aggregations of nanorods in THF. TEM and XPS confirm the existence of binding bonds between the sulfur groups of PTF and the gold surface in PTF‐GNRs. Compared with polymer surfactant (PTF), the faster PL emission decay in PTF‐GNRs match well with the PL quenching of PTF‐GNRs. Surface modifications are verified by UV‐visible, TEM, XPS, PL and lifetime measurements.

Synthesis and characterization of oleic acid stabilized CdTe quantum dots and their properties as luminescence quencher of a pyridine pendented rod-coil homopolymer

“…The obvious advantage of CdTe, such as much better electron mobility, results in the replacement of other nanomaterials in optoelectronic devices [12,13]. The high thermal, photochemical stability and surface passivation through different functional groups make this quantum dot an appealing material for the construction of various optoelectronic devices including photoactive and sensitive molecule-nanocrystals hybrids [14][15][16].…”

Scalable Synthesis of Switchable Assemblies of Gold Nanorod Lyotropic Liquid Crystal Nanocomposites

“…After the ligand exchange with PSS, positively charged CTBA‐AuNRs (ζ = +44 ± 2 mV) became strongly negative (ζ = –31 ± 2 mV). As shown in Figure c, after the ligand exchange with MPS‐Jeffamine, an Au‐S S2p peak was observed in the high resolution XPS spectrum indicating the presence of a bond between MPS‐Jeffamine and AuNRs surface …”

Metal–Polymer Heterojunction in Colloidal-Phase Plasmonic Catalysis

“… 26 The reversal of ζ-potential values before and after the ligand exchange additionally confirmed the presence of polymer on the surface of gold nanoparticles ( Figure 2 c). Upon the functionalization of gold nanoparticles with PTEBS, the lifetime of excited states of the polymer decreased from 1.1 to 0.55 ns, suggesting fluorescence quenching via energy transfer 35 ( Figure 3 d). Overall, the formation of a polymer–metal heterojunction mutually alters the properties of the plasmonic core and polymer shell.…”