Abstract
We report here the first electrochemical methods to prepare elemental Au(0)-coated TiO2 nanoparticles with controllable coverages. First, Au substrates were cycled in a deoxygenated aqueous solution containing 0.1 N HCl and 1 mM TiO2 nanoparticles from -0.28 to +1.22 V versus Ag/AgCl at 500 mV/s with different numbers of scans. The durations at the cathodic and anodic vertexes were 10 and 5 s, respectively. After this process, positively charged Au-coated TiO2 nanoparticles were formed in the solutions. Then a cathodic overpotential of 0.6 V from the open circuit potential of ca. 0.82 V versus Ag/AgCl was applied under sonication to synthesize elemental Au(0)-coated TiO2 nanoparticles. The coverage of Au shells in the elemental Au-coated TiO2 nanoparticles is varied from 10% to 95% by increasing the number of scans from 10 to 50 in preparing the positively charged Au-coated TiO2 nanoparticles. The extremely high coverage of 95% in this study is notable, as compared with other methods to prepare Au-coated TiO2 nanoparticles.
Original language | English |
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Pages (from-to) | 6951-6955 |
Number of pages | 5 |
Journal | Langmuir |
Volume | 20 |
Issue number | 16 |
DOIs | |
Publication status | Published - Aug 3 2004 |
Externally published | Yes |
ASJC Scopus subject areas
- Condensed Matter Physics
- Spectroscopy
- General Materials Science
- Surfaces and Interfaces
- Electrochemistry