title: Synthesis and self-assembly of highly monodispersed quasispherical gold nanoparticles.
abstract: We report the synthesis of cetyltrimethylammonium bromide (CTAB) assisted seed mediated growth of highly pure and monodispersed quasispherical gold nanoparticles (QAuNPs) and their self-assembly on the silica/glass substrates. The seed-mediated growth approach was modified to prepare size-tunable monodispersed QAuNPs with sizes ranging from 20 to 150 nm. The larger, more uniform seeds and lower CTAB concentration resulted in the formation of relatively large QAuNPs with improved monodispersity (relative standard deviation (RSD) of ∼5-8%) and high purity in their shapes. In addition, CATB-capped QAuNPs can be spontaneously assembled into closely packed and highly aligned superstructures with well-defined mutillayers (two to six layers) on silica substrates. Furthermore, CATB-capped QAuNPs can easily construct density-controllable QAuNP chips by electrostatic self-assembly, showing their promising applications for single-nanoparticle plasmonic sensors.
authors: School of Chemical and Biomedical Engineering, Nanyang Technological University, 637457 Singapore.
authors: Youju
authors: Y
authors: Huang
authors: Dong-Hwan
authors: DH
authors: Kim
mesh_terms: D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles; D008855:Microscopy, Electron, Scanning; D013056:Spectrophotometry, Ultraviolet; D055672:Static Electricity
chemical_list: D006046:Gold