Fluorescence Fluorescence microscopy Nanoparticles Gold Molecules chemistry Gold Nanoparticles Kinetics Metal nanoparticles Microscopy, Fluorescence Photochromism article fluorescence microscopy COMERCIALIZACION COMERCIO Catalysis Fluorescent Dyes Fluorophores Gold nanoparticle Isomers Nanocrystallines Oxidation-Reduction Quenching Rate constants Refractive index Total internal reflection fluorescence microscopy Triplet state fluorescent dye synthesis Azobenzene