title: Size-controllable synthesis of surface-enhanced Raman scattering-active gold nanoparticles coated on TiO2.
abstract: As shown in the literature, gold nanoparticles (NPs) were popularly used in the fields of catalyst and surface-enhanced Raman scattering (SERS). In this work, size-controllable Au NPs coated on TiO(2) are synthesized by adjusting the pH of solutions based on sonoelectrochemical methods. The size-controlled Au NPs on TiO(2), ranging from 2 to 80 nm in diameter, can be obtained by varying the pH of solutions from 3 to 7 and placing the sample for 3 h before sonoelectrochemical reductions. The optimal particle sizes of Au NPs on TiO(2) to obtain the strongest SERS effects under an irradiation of 785 nm for probe molecules of adsorbed Rhodamine 6G (R6G) and deposited polypyrrole (PPy) are all ca. 60 nm.
authors: Department of Biochemistry, School of Medicine, College of Medicine, Taipei Medical University, No. 250, Wu-Hsing St., Taipei 11031, Taiwan.
authors: Tai-Chih
authors: TC
authors: Kuo
authors: Ting-Chu
authors: TC
authors: Hsu
authors: Yu-Chuan
authors: YC
authors: Liu
authors: Kuang-Hsuan
authors: KH
authors: Yang
mesh_terms: D004563:Electrochemistry / Q000379:methods*; D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D053768:Metal Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D013010:Sonication; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties; D014025:Titanium
chemical_list: C009495:titanium dioxide; D006046:Gold; D014025:Titanium