title: Chitosan-mediated synthesis of gold nanoparticles on patterned poly(dimethylsiloxane) surfaces.
abstract: Synthesis of gold nanoparticles on surfaces has been accomplished by the incubation of poly(dimethylsiloxane) (PDMS) films in tetrachloroauric(III) acid and chitosan solution at room temperature and 4 degrees C. One important point in the present study is that the synthesis selectively occurred on the PDMS surface. These observations are substantially different from the reaction in solution, in which no particles can be formed at room temperature. Computation of surface plasmon bands (SPBs) based on Mie theory suggests that the particles are partially coated by chitosan molecules, and the experimental results confirm the theoretical calculations. The proposed mechanism is that chitosan molecules adsorbed or printed on the PDMS surfaces act as reducing/stabilizing agents. Furthermore, PDMS films patterned with chitosan could induce localized synthesis of gold nanoparticles in regions capped with chitosan only. In this way, colloidal patterns were fabricated on the surfaces with high spatial selectivity simultaneously with the synthesis of the particles. Surface-induced fluorescence quenching was observed in the regions capped with gold nanoparticles as well.
authors.affiliation: Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China.
authors.forename: Bo
authors.initials: B
authors.lastname: Wang
authors.forename: Ke
authors.initials: K
authors.lastname: Chen
authors.forename: Shan
authors.initials: S
authors.lastname: Jiang
authors.forename: François
authors.initials: F
authors.lastname: Reincke
authors.forename: Weijun
authors.initials: W
authors.lastname: Tong
authors.forename: Dayang
authors.initials: D
authors.lastname: Wang
authors.forename: Changyou
authors.initials: C
authors.lastname: Gao
mesh_terms: D048271:Chitosan / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D008958:Models, Molecular; D049329:Nanostructures / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D010316:Particle Size; D012828:Silicones / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D004129:Dimethylpolysiloxanes; D009942:Organometallic Compounds; D012828:Silicones; C013830:baysilon; D006046:Gold; D048271:Chitosan