English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/62632
Title: Morphological and interaction effects on the surface plasmon resonance of metal nanoparticles
Authors: Gonzalo de los Reyes, José; Serna, Rosalía; Solís Céspedes, Javier; Babonneau, D.; Afonso, Carmen N.
Issue Date: 2003
Publisher: Institute of Physics Publishing
Citation: Journal of Physics Condensed Matter 15: S3001-S3010 (2003)
Abstract: The influence of the morphology and separation of Ag nanoparticles (NPs) on the position of the surface plasmon resonance has been studied. The NPs have been produced on amorphous a-Al2O3 surfaces by means of alternate pulsed laser deposition in a layered structure. The films finally produced consist of five layers containing the NPs with spacing layers of a-Al2O3, the space between the NPs also being filled-in with a-Al2O3. The in-plane dimensions of the NPs have been varied in the 2-12 nm range while their shape changes from that of spheres to that of oblate ellipsoids. The in-depth separation of the layers containing the NPs was varied in the 8-33 nm range. Above an average in-plane dimension threshold of 4.6 nm, the optical absorption of these nanostructured films exhibits two resonances that shift red and blue in respect to that observed in smaller NPs. The results clearly show that this threshold is well above that at which the NPs become oblate spheroids and it is instead close to the threshold for in-plane coalescence among adjacent NPs. The results also show that multipolar electromagnetic interactions among NPs can be neglected for separations larger than 4.4 ± 0.7 nm but they become important for coalesced NPs.
URI: http://hdl.handle.net/10261/62632
DOI: 10.1088/0953-8984/15/42/002
Identifiers: doi: 10.1088/0953-8984/15/42/002
issn: 0953-8984
Appears in Collections:(CFMAC-IO) Artículos
Files in This Item:
File Description SizeFormat 
Gonzalo.pdf167,51 kBAdobe PDFThumbnail
Show full item record

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.