title: Coordination power adjustment of surface-regulating polymers for shaping gold polyhedral nanocrystals.
abstract: PVP (poly(vinyl pyrrolidone)) is a common polymer that behaves as a surface-regulating agent that shapes metal nanocrystals in the polyol process. We have used different polymers containing tertiary amide groups, namely PVCL (poly(vinyl caprolactam)) and PDMAm (poly(N,N-dimethyl acrylamide)), for the synthesis of gold polyhedrons, including octahedrons, cuboctahedrons, cubes, and higher polygons, under the present polyol reaction conditions. The basicity and surface coordination power of the polymers are in the order of PVCL, PVP, and PDMAm. A correlation is observed between the coordination power of the polymers and the resulting gold nanocrystal size. Strong coordination and electron donation from the polymer functional groups to the gold surface restrict particle growth rates, which leads to small nanocrystals. The use of PVCL can yield gold polyhedral structures with small sizes, which cannot be achieved in the reactions with PVP. Simultaneous hydrolysis of the amide group in PDMAm leads to carboxylate functionality, which is very useful for generating chemical and bioconjugates through the formation of ester and amide bonds.
authors.affiliation: Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Republic of Korea.
authors.forename: Seon Joo
authors.initials: SJ
authors.lastname: Lee
authors.forename: Garam
authors.initials: G
authors.lastname: Park
authors.forename: Daeha
authors.initials: D
authors.lastname: Seo
authors.forename: Duyoun
authors.initials: D
authors.lastname: Ka
authors.forename: Sang Youl
authors.initials: SY
authors.lastname: Kim
authors.forename: Im Sik
authors.initials: IS
authors.lastname: Chung
authors.forename: Hyunjoon
authors.initials: H
authors.lastname: Song
mesh_terms: D006046:Gold / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D011108:Polymers; D006046:Gold