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Synthesis and Plasmon‐Induced Charge‐Transfer Properties of Monodisperse Gold‐Doped Titania Microspheres
Author(s) -
Wang Ping,
Xie TengFeng,
Li HaiYan,
Peng Liang,
Zhang Yu,
Wu TongShun,
Pang Shan,
Zhao YunFeng,
Wang DeJun
Publication year - 2009
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200802138
Subject(s) - chloroauric acid , materials science , surface photovoltage , nanodot , anatase , colloidal gold , dispersity , photocurrent , plasmon , surface plasmon resonance , doping , titanium dioxide , photocatalysis , chemical engineering , nanotechnology , photochemistry , nanoparticle , chemistry , optoelectronics , spectroscopy , organic chemistry , physics , quantum mechanics , polymer chemistry , engineering , metallurgy , catalysis
Functional spheres : Monodisperse gold‐doped titania spheres with tunable sizes under high concentration of titanium precursor have been synthesized by introducing trace amounts of chloroauric acid into the reaction system. Surface photovoltage, surface photocurrent, and transient photovoltage measurements (see figure) of annealed samples reveal that gold nanodots can act as both electron acceptors and donors under the illumination of different wavelengths of light.Monodisperse gold‐doped titania microspheres have been synthesized under high concentration of a titanium precursor (9.34 m M ) by introducing a trace amount of chloroauric acid (CA) into the reaction system; the size of the microspheres can be easily tuned (from ≈587 to ≈392 nm) by varying the amount of the CA added. The plausible formation mechanism has been discussed in detail. Chloroauric acid was found to act as the stabilizing agent to induce the formation of monodisperse colloidal spheres. Gold‐doped anatase titania spheres with ≈7 nm gold nanodots on the surface were synthesized by calcination. Interestingly, results from surface photocurrent, surface photovoltage, and transient photovoltage measurements indicate that the gold nanodots exhibit different electronic properties when the gold‐doped anatase titania spheres were illuminated by different wavelengths of light: one is an electron acceptor in the UV region, while the other is an electron donor in the visible region. Furthermore, the decay time of the injected plasmon‐induced electrons was found to be on the millisecond timescale and increased with increasing amounts of gold doped.