title: Charged gold nanoparticles in non-polar solvents: 10-min synthesis and 2D self-assembly.
abstract: We report a fast and highly reproducible chemical synthesis method for colloidal gold nanoparticles which are negatively charged in nonpolar solvents and coated with hydrophobic organic molecules. If a hexane droplet containing charged gold nanoparticles is mixed with a larger toluene droplet, nanoparticles immediately float to the air-toluene interface and form a close-packed monolayer film. After evaporation of the solvent molecules, the monolayer film of nanoparticles can be deposited to any substrate without any limit in size. The synthesis does not require a postsynthesis cleaning step, since the two immiscible liquid phases separate the reaction byproducts from gold nanoparticles and a minimal amount of coating molecules is used.
authors.affiliation: Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA.
authors.forename: Matthew N
authors.initials: MN
authors.lastname: Martin
authors.forename: James I
authors.initials: JI
authors.lastname: Basham
authors.forename: Paul
authors.initials: P
authors.lastname: Chando
authors.forename: Sang-Kee
authors.initials: SK
authors.lastname: Eah
mesh_terms: D000096:Acetone / Q000737:chemistry; D003102:Colloids / Q000138:chemical synthesis / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D006586:Hexanes / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D008567:Membranes, Artificial; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D012997:Solvents / Q000737:chemistry; D013499:Surface Properties; D014050:Toluene / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D003102:Colloids; D006586:Hexanes; D008567:Membranes, Artificial; D012997:Solvents; D014867:Water; D000096:Acetone; D014050:Toluene; D006046:Gold