Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
| Autor: | Philip Kalisman, Lilac Amirav, Yifat Nakibli |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Sulfide General Chemical Engineering Nanoparticle chemistry.chemical_element 02 engineering and technology Sulfides Iridium Photochemistry General Biochemistry Genetics and Molecular Biology Catalysis Crystallinity 020210 optoelectronics & photonics Cadmium Compounds 0202 electrical engineering electronic engineering information engineering Particle Size Selenium Compounds chemistry.chemical_classification Nanotubes General Immunology and Microbiology General Neuroscience Chemistry Semiconductors chemistry Photocatalysis Nanoparticles Nanorod Particle size Oxidation-Reduction |
| Zdroj: | Journal of Visualized Experiments. |
| ISSN: | 1940-087X |
| DOI: | 10.3791/53675-v |
| Popis: | We demonstrate a procedure for the photochemical oxidative growth of iridium oxide catalysts on the surface of seeded cadmium selenide-cadmium sulfide (CdSe@CdS) nanorod photocatalysts. Seeded rods are grown using a colloidal hot-injection method and then moved to an aqueous medium by ligand exchange. CdSe@CdS nanorods, an iridium precursor and other salts are mixed and illuminated. The deposition process is initiated by absorption of photons by the semiconductor particle, which results with formation of charge carriers that are used to promote redox reactions. To insure photochemical oxidative growth we used an electron scavenger. The photogenerated holes oxidize the iridium precursor, apparently in a mediated oxidative pathway. This results in the growth of high quality crystalline iridium oxide particles, ranging from 0.5 nm to about 3 nm, along the surface of the rod. Iridium oxide grown on CdSe@CdS heterostructures was studied by a variety of characterization methods, in order to evaluate its characteristics and quality. We explored means for control over particle size, crystallinity, deposition location on the CdS rod, and composition. Illumination time and excitation wavelength were found to be key parameters for such control. The influence of different growth conditions and the characterization of these heterostructures are described alongside a detailed description of their synthesis. Of significance is the fact that the addition of iridium oxide afforded the rods astounding photochemical stability under prolonged illumination in pure water (alleviating the requirement for hole scavengers). |
| Databáze: | OpenAIRE |
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