1. Morphology and CO Oxidation Activity of Pd Nanoparticles on SrTiO3 Nanopolyhedra
- Author
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Cassandra George, Lawrence A. Crosby, Peter C. Stair, Laurence D. Marks, Michael J. Bedzyk, Kenneth R. Poeppelmeier, Neil M. Schweitzer, Richard P. Van Duyne, Jianguo Wen, Robert M. Kennedy, and Bor-Rong Chen
- Subjects
Materials science ,Diffuse reflectance infrared fourier transform ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Atomic layer deposition ,chemistry.chemical_compound ,Chemical engineering ,chemistry ,Transmission electron microscopy ,Strontium titanate ,Hydrothermal synthesis ,0210 nano-technology ,Single crystal ,Palladium - Abstract
Single crystal SrTiO3 nanocuboids having primarily TiO2-(001) surfaces and nanododecahedra having primarily (110) surfaces were created by two separate hydrothermal synthesis processes. Pd nanoparticles grown on the two sets of STO nanopolyhedra by atomic layer deposition show different morphologies and CO oxidation performance. Transmission electron microscopy and small-angle X-ray scattering show that 2–3 nm Pd nanoparticles with 3–5 nm interparticle distances decorate the STO surfaces. When the number of ALD cycles increases, the growth of the Pd nanoparticles is more significant in size on TiO2-(001)-STO surfaces, while that on (110)-STO surfaces is more predominant in number. High resolution electron microscopy images show that single crystal and multiply twinned Pd nanoparticles coexist on both types of the STO nanopolyhedra and exhibit different degrees of adhesion. The CO oxidation reaction, which was employed to determine the dependence of catalytic activity, showed that the Pd catalytic performa...
- Published
- 2018
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