Grafting and Coloring onto Silver Nanoparticles by Photoinduced Surface Modification

摘要

Localized surface plasmon resonance (LSPR) is the general optical phenomenon of noble metal nanoparticles. It results from the collective oscillation of conduction electrons and is responsible for the brilliant colors of metal colloidal solutions. The resonance frequency of LSPR can be easily tuned by the size, shape, composition, and microenvironment properties of the nanoparticles, and hence noble metal nanoparticles are potentially very useful materials in many application fields, such as optical devices, optical energy conversion, catalysis, near field scanning optical microscopy, surface enhanced spectroscopies, chemical and biological sensors, etc. Especially, the surface modification of noble metal nanoparticles can be easily carried out with alkanethiols, biomolecules, polymers, or other ligands. Nanoparticles via surface modifications can create new functional materials and meet the requirements in the applications described above. Therefore, nanoparticles with versatile surface chemistry have been the subject of intensive studies.