title: One-step controlled synthesis of anisotropic gold nanostructures with aniline as the reductant in aqueous solution.
abstract: We report a general and versatile method for controlled synthesis of anisotropic gold nanostructures through the reduction of HAuCl4 by aniline in aqueous solution, without the need for an additional stabilizer or capping agent. In this approach, the reduction kinetics of AuCl-4 can be altered by simply adjusting the initial pH and temperature, inducing the formation of a wide variety of anisotropic nanostructures such as dispersed or multilayered plates, wires with networked or paramecium-like structures, and ginger-shaped particles. AFM, TEM, XRD, EDX, FTIR, and UV-vis-NIR measurements were used to characterize the resulting gold nanostructures. Investigation reveals that in situ formed polyaniline serves effectively as a capping agent to direct the shape of gold nanostructures during the slow growth process. These as-synthesized gold nanostructures exhibit strongly shape-dependent optical properties. This facile approach may be extended to the synthesis of some other anisotropic metal nanostructures such as platinum or palladium.
authors.affiliation: State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China.
authors.forename: Zhirui
authors.initials: Z
authors.lastname: Guo
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Lan
authors.initials: L
authors.lastname: Huang
authors.forename: Meng
authors.initials: M
authors.lastname: Wang
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Jianfei
authors.initials: J
authors.lastname: Sun
authors.forename: Lina
authors.initials: L
authors.lastname: Xu
authors.forename: Ning
authors.initials: N
authors.lastname: Gu
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D016880:Anisotropy; D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D049329:Nanostructures / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D012996:Solutions / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D000814:Aniline Compounds; D012996:Solutions; D014867:Water; D006046:Gold; C023650:aniline