Impacts of Organic Stabilizers on Catalysis of Au Nanoparticles from Colloidal Preparation
| Autor: | Ruyi Zhong, Yongchun Hong, Ke-Qiang Sun, Bo-Qing Xu |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Polyvinylpyrrolidone
Chemistry Inorganic chemistry technology industry and agriculture Nanoparticle General Chemistry Catalysis Cinnamaldehyde Colloid chemistry.chemical_compound Chemical engineering medicine Fourier transform infrared spectroscopy High-resolution transmission electron microscopy medicine.drug Stabilizer (chemistry) |
| Zdroj: | ACS Catalysis. 4:3982-3993 |
| ISSN: | 2155-5435 |
| Popis: | Metal nanoparticles (NPs) from colloidal synthesis are advantageous in fundamental catalysis research because of their precisely controlled size and morphology but unfortunately are usually contaminated with residues from the organic stabilizer essentially required in the synthesis. These residues could modify the surface property and disturb the catalysis intrinsic to “clean” NPs. Herein, polyvinylpyrrolidone (PVP)-stabilized Au NPs (4.7 ± 1.0 nm) from colloidal synthesis were immobilized on SiO2 support and subjected to ultraviolet-ozone (UVO) treatment to remove the residues. Hydrogenation reactions of p-chloronitrobenzene (p-CNB) and cinnamaldehyde (CAL) were conducted to probe consequences of the stabilizer removal on the catalytic properties of Au NPs. Measurements by FTIR and XPS revealed a controlled removal and degradation of PVP according to the UVO-treatment duration. Careful HRTEM analysis disclosed that both the size and morphology of Au NPs remained unchanged after the UVO-treatment. Residua... |
| Databáze: | OpenAIRE |
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