Abstract
Fabrication of surface-immobilized silver nanostructures with reproducible plasmonic properties by dip-coating technique is difficult due to shape alteration. To address this challenge, we used a polyelectrolyte multilayer to promote immobilization of as-received triangular silver nanoplates (TSNP) on a glass substrate through electrostatic interaction. The substrate-immobilized TSNP were characterized by absorption spectrophotometry and scanning electron microscopy. The bandwidth and peak position of localized surface plasmon resonance (LSPR) bands can be tuned by simply varying the concentration of the colloidal solution and immersion time. TSNP immobilized from a higher concentration of colloidal solution with longer immersion time produced broadened LSPR bands in the near-IR region, while a lower concentration with shorter immersion time produced narrower bands in the visible region. The shape of the nanoplates was retained even at long immersion time. Analysis of peak positions and bandwidths also revealed the point at which the main species of the immobilization had been changed from isolates to aggregates.
Highlights
Silver nanostructures have gained considerable interest because of their potential applications in plasmonic imaging and sensing [1,2,3,4,5]
The bandwidth and peak position of localized surface plasmon resonance (LSPR) bands can be tuned by varying the concentration of the colloidal solution and immersion time
After confirming the immobilization of triangular silver nanoplates (TSNP) on PEMmodified glass substrate, we studied the effects of immersion time and concentration of the colloidal solution to the optical properties of the immobilized TSNP
Summary
Silver nanostructures have gained considerable interest because of their potential applications in plasmonic imaging and sensing [1,2,3,4,5]. These applications depend on the nanostructure’s localized surface plasmon resonance (LSPR) properties such as band position, bandwidth, and magnitude. Recent studies [6,7,8,9] have suggested that anisotropic silver nanostructures are better than isotropic nanoparticles for plasmonic applications. It is important to control the aggregation of TSNP to prevent shape alteration
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