Aufsatz in einer Fachzeitschrift
Annealing-induced reversible change in optical absorption of Ag nanoparticles



Details zur Publikation
Autor(inn)en:
Bi, H.; Cai, W.; Zhang, L.; Martin, D.; Träger, F.
Verlag:
AIP Publishing
Publikationsjahr:
2002
Zeitschrift:
Applied Physics Letters
Seitenbereich:
5222-5224
Abkürzung der Fachzeitschrift:
Appl. Phys. Lett.
Jahrgang/Band:
81
Erste Seite:
5222
Letzte Seite:
5224
ISSN:
0003-6951

Zusammenfassung, Abstract
Optical absorption of silver nanoparticles dispersed within pores of monolithic mesoporous silica was investigated after annealing in different atmospheres. It has been found that treatment in H-2 or N-2 induces a strong surface plasmon resonance (SPR) as usually expected, but air annealing results in the disappearance of the SPR, which is contrary to the fact that bulk metal silver is stable and not oxidized in air at above 200degreesC. The absence and appearance of the SPR absorption can be controlled through alternate annealing in air and H-2 (or N-2). Thermodynamic analysis for oxidation of Ag nanoparticles, by additionally considering the surface and curvature effects of a particle, shows the existence of critical particle size. Only when a Ag particle size is smaller than the critical value is the oxidation possible in air at above 200degreesC. The optical changes are attributed to,the occurrence of the redox of the Ag particles in different atmospheres at a high temperature. (C) 2002 American Institute of Physics. [DOI: 10.1063/1.1532757].


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Zuletzt aktualisiert 2019-01-11 um 16:05