Dichroic Thin Layer Films Prepared from Alkanethiol-Coated Gold Nanoparticles

摘要: A simple method for preparing thin dichroic metal composite films is described. Alkanethiol-derivatized gold particles are incorporated into poly(tetrafluoroethylene) (PTFE) matrixes that have been friction-transferred onto glass slides. Exposure of these particle/PTFE composites to flame (ca. 1700 °C) leads strong properties in the visible spectrum. Extinction spectra obtained with incident electric field polarized perpendicular direction friction orientation show a plasmon extinction band maximum at ca. 545 nm. Spectra collected parallel plateau from λ = 550 850 The experimental polarization general accord predictions Bruggeman effective medium approximation (EMA). EMA theory modeling suggests structures not surrounded primarily by air, but rather coated with, or imbedded within, material itse...