Self-Assembly of TOPO-Derivatized Silver Nanoparticles into Multilayered Film

摘要: A novel method for transferring silver nanoparticles from aqueous solution into organic solvents such as toluene or hexane was developed. Phase-transfer reagent, tri-n-octylphosphine oxide, TOPO, provides a capping shell around Ag particles that enables concentrating nanoparticle dispersion in toluene, which is prerequisite successful 3D self-assembly. The dispersed are stable long period of time (at least six months). Self-assembly high concentrations TOPO-capped results multilayered mirrorlike film formed onto glass substrates. SEM images reveal fine-grained consisting 10-nm close-packed particles. surface plasmon absorption the structure 100 nm red-shifted compared to isolated solution, and result interparticle coupling dielectric functions near proximity. Redispersing revealed spectrum virtually identical ...