title: In-situ incorporation of gold nanoparticles of desired sizes into three-dimensional macroporous matrixes.
abstract: We present here a facile route to the incorporation of gold nanoparticles (GNPs) with desired sizes into three-dimensionally ordered macroporous (3DOM) matrixes. Our route combined the first attachment of small GNPs to the silica colloidal crystal templates as precursors and their subsequent controlled growth by the in-situ chemical reduction method. The desired enlargement of GNPs was acquired via their alternating and repeated exposure to solutions of auric salts and reducing agent NH(3)OH. Such gold-decorated silica templates were also converted into self-sustained polystyrene (PS) macroporous films with GNPs embedded in their wall structures. The growth of gold seeds can be easily followed by their UV-vis absorbance spectra. The route provides an alternative way to incorporate GNPs with predetermined sizes into 3DOM matrixes without destroying their ordered structures. A highlight of our approach is that it obviates the need for the preformation of various-sized GNPs, which is an indispensable step in many other approaches.
authors.affiliation: State Key Laboratory of Bioelectronics, Department of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, PR China.
authors.forename: Shaohua
authors.initials: S
authors.lastname: Ding
authors.forename: Weiping
authors.initials: W
authors.lastname: Qian
authors.forename: Yong
authors.initials: Y
authors.lastname: Tan
authors.forename: Yi
authors.initials: Y
authors.lastname: Wang
mesh_terms: D003102:Colloids / Q000737:chemistry*; D003460:Crystallization; D006046:Gold / Q000737:chemistry*; D013058:Mass Spectrometry; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D011137:Polystyrenes / Q000737:chemistry*; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D003102:Colloids; D011137:Polystyrenes; D006046:Gold; D012822:Silicon Dioxide