title: Facile synthesis of gold octahedra by direct reduction of HAuCl4 in an aqueous solution.
abstract: This paper describes a water-based protocol that provides a simple, convenient, and environmentally benign route to the synthesis of Au octahedra. Specifically, we obtained single-crystal Au octahedra (ca. 85% of the product) with an edge length of 32.4+/-2.3 nm and singly twinned, truncated bipyramids (ca. 15%) by reducing HAuCl(4) with N-vinyl pyrrolidone in an aqueous solution in the presence of a proper amount of cetyltrimethylammonium chloride (CTAC). Our mechanistic study indicates that the formation of Au octahedra could be explained by oxidative etching, a pathway that has already been validated for the synthesis of nanocrystals for a number of different noble metals.
authors.affiliation: Department of Biomedical Engineering, Washington University, Saint Louis, Missouri 63130, USA.
authors.forename: Weiyang
authors.initials: W
authors.lastname: Li
authors.forename: Younan
authors.initials: Y
authors.lastname: Xia
mesh_terms: D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry*; D003460:Crystallization; D006046:Gold / Q000737:chemistry*; D017612:Gold Compounds / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D011760:Pyrrolidinones / Q000737:chemistry*; D012996:Solutions; D014867:Water
chemical_list: D002593:Cetrimonium Compounds; D002712:Chlorides; D017612:Gold Compounds; D011760:Pyrrolidinones; D012996:Solutions; D014867:Water; D006046:Gold; C042670:N-vinyl-2-pyrrolidinone; C024568:gold tetrachloride, acid; D000077286:Cetrimonium