Stabilization of silver nanoparticles in nonanoic acid: A temperature activated conformation reaction observed with surface enhanced Raman spectroscopy
| Autor: | Gokul Malyavanatham, Michael F. Becker, Dale E. Henneke, Desiderio Kovar, William T. Nichols, Daniel T. O’Brien, John W. Keto |
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| Rok vydání: | 2003 |
| Předmět: |
Materials science
Laser ablation Nonanoic acid Analytical chemistry General Physics and Astronomy Nanoparticle Photoionization Surface-enhanced Raman spectroscopy Photochemistry medicine.disease_cause Silver nanoparticle chemistry.chemical_compound chemistry medicine Physical and Theoretical Chemistry Spectroscopy Ultraviolet |
| Zdroj: | The Journal of Chemical Physics. 119:6802-6809 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.1603714 |
| Popis: | Silver nanoparticles were synthesized by ultraviolet (λ=248 nm) laser ablation of an aerosol of micron-sized source particles entrained in nitrogen. As a result of thermionic electron emission and photoionization, nanoparticles produced in this manner were highly charged. The resulting aerosol was primarily composed of nanometer sized particles. The charged nanoparticles were deflected by an electric field that was perpendicular to the aerosol flow. Deflected nanoparticles were deposited directly into n-nonanoic acid flowing along the negative collection electrode. Suspensions of nanoparticles collected in this manner were dark gray in color and were found to be flocculated. When the suspensions were heated to temperatures above 75 °C, a color change from gray to clear was observed. Ultraviolet/visible extinction spectroscopy was performed on each suspension following annealing at different temperatures and times. By modeling the absorption decrease as a first order reaction, a good fit for the data was f... |
| Databáze: | OpenAIRE |
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