Surface modification of gold nanorods by grafting fluorene-based conjugated copolymers containing thiol-pendants

Duryodhan Sahu, Hsuan Chih Chu, Po Jen Yang, Hong-Cheu Lin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

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. TF-GNRs and PTF-GNRs provide the grafting evidence of TF and PTF to the surfaces of gold nanorods GNRs. Compared with TF-GNRs, the resulting PTF-GNRs (gold nanorods surface-modified with polymer) show a better solubility and stability against aggregations of nanorods in THF due to the stronger longitudinal surface plasmon band.

Original languageEnglish
Pages (from-to)1550-1558
Number of pages9
JournalMacromolecular Chemistry and Physics
Volume213
Issue number15
DOIs
StatePublished - 14 Aug 2012

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