Gold Nanoparticles with Externally Controlled, Reversible Shifts of Local Surface Plasmon Resonance Bands

Abstract

We have achieved reversible tunability of local surface plasmon resonance in conjugated polymer functionalized gold nanoparticles. This property was facilitated by the preparation of 3,4-ethylenedioxythiophene (EDOT) containing polynorbornene brushes on gold nanoparticles via surface-initiated ring-opening metathesis polymerization. Reversible tuning of the surface plasmon band was achieved by electrochemically switching the EDOT polymer between its reduced and oxidized states.

An exfoliated clay-poly(norbornene) nanocomposite prepared by metal-mediated surface-initiated polymerization

“…Previous efforts in our group focused on growing polymer chains directly on surfaces of nanoparticle substrates. Inorganic nanoparticles (silica and gold spheres, and two‐dimensional synthetic clay) were synthesized and used as SIP templates for polymerization of norbornene and its derivatives to prepare polymer brushes . In this work our ultimate goal is to elucidate the structure‐property relationships that underlie the enhancements seen for nanocomposites, exfoliated nanocomposites in particular.…”

Optical absorption and photoluminescence studies of gold nanoparticles deposited on porous silicon

“…Due to the plasmon resonance in metal NPs, the interplay between NCs and NPs can modify the spectral features of NCs to improve emission efficiency as it involves the charge transfer across the semiconductor/metal interfaces [2]. Gold nanoparticles (AuNPs) are the subject of increasing interests due to their essential properties and localized surface plasmon resonance in the visible spectrum wavelength [3]. The interplay effect in combining the gold and silicon is widely used in electronic devices in controlling their lifetime and resistivity [4,5].…”

Selective and colorimetric detection of Ba2+ ions in aqueous solutions using 11-mercaptoundecylphosphonic acid functionalized gold nanoparticles

“…For example, AuNPs are red in color; however, AuNPs aggregates generated by different metal ions show changes to other colors such as yellow, purple or blue. [15][16][17][18][19][20] AuNPs display strong surface plasmon resonance (SPR) absorption properties, 21,22 which are extremely sensitive to size, shape and interparticle plasmon coupling on analyte-induced aggregation of AuNPs. These results in a color change from red to blue that may be observed by the naked eye.…”