Localized surface plasmon resonance (LSPR) sensitivity of Au nanodot patterns to probe solvation effects in polyelectrolyte brushes

摘要

We report localized surface plasmon resonance (LSPR) of hexagonal Au nanodot arrays to detect changes in the thickness and conformation of poly[2-(methacryloyloxy)ethyltrimethyl ammonium chloride] (PMETAC) brushes.rnRecently, metallic nanoparticles and nanostructures have been successfully employed as molecular-recognition elements and amplifiers in biosensors, using evanescent electromagnetic fields such as propagating surface plasmon resonance (SPR). The plasmon induced enhancement of the electromagnetic field near the metal surface has been used extensively in sensors, and more recently also to amplify fluorescence and Raman scattering. In sensor applications, the changes in the plasmonic resonance wavelength of maximum absorption or scattering are monitored as a function of changes in the chemical and physical environment of the surface of the nanoparticles.