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Enhanced plasmonic behavior of bimetallic (Ag-Au) multilayered spheres.

Peña-Rodríguez O, Pal U - Nanoscale Res Lett (2011)

Bottom Line: In this article we study the plasmonic behavior of some stable, highly biocompatible bimetallic metal-dielectric-metal (MDM) and double concentric nanoshell (DCN) structures.By simply switching the material of the inner structure from Au to Ag, the intensity of their surface plasmon resonance could be increased in the optical transparency region of the human tissues up to 20 and 60 percent for the MDM and DCN, respectively, while the biocompatibility is retained.The obtained results indicate that these novel structures could be highly suitable for surface enhanced Raman scattering and photothermal cancer therapy.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, Barcelona, 08193, Spain. ovidio@bytesfall.com.

ABSTRACT
In this article we study the plasmonic behavior of some stable, highly biocompatible bimetallic metal-dielectric-metal (MDM) and double concentric nanoshell (DCN) structures. By simply switching the material of the inner structure from Au to Ag, the intensity of their surface plasmon resonance could be increased in the optical transparency region of the human tissues up to 20 and 60 percent for the MDM and DCN, respectively, while the biocompatibility is retained. The obtained results indicate that these novel structures could be highly suitable for surface enhanced Raman scattering and photothermal cancer therapy.

No MeSH data available.


Simulated extinction efficiency for Au-Au and Ag-Au DCN structures. Simulated extinction efficiency as a function of the wavelength for (a) Au-Au and (b) Ag-Au DCN structures, having t0 = t2 = 5 nm, while t1 and t3 are varied simultaneously (t1 = 2, ..., 14 nm; t3 = 16 nm - t1).
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Figure 4: Simulated extinction efficiency for Au-Au and Ag-Au DCN structures. Simulated extinction efficiency as a function of the wavelength for (a) Au-Au and (b) Ag-Au DCN structures, having t0 = t2 = 5 nm, while t1 and t3 are varied simultaneously (t1 = 2, ..., 14 nm; t3 = 16 nm - t1).

Mentions: The theoretical extinction efficiencies, calculated for fixed dielectric layers (5 nm) and the simultaneous inverse variations of t1 and t3 (t1 = 2, ..., 14 nm; t3 = 16 nm - t1) are shown in Figures 3 and 4 for the MDM and DCN structures, respectively. The spectra obtained as a function of t3 can be roughly divided into three regions. The first one corresponds to a very thin outer layer (below 5 nm); for which the and modes are widely separated. In this case, the position of the bonding (antibonding) mode of the composite structures is almost entirely controlled by the () mode. For this reason the bonding mode (the one we are interested in) is virtually identical for both compositions and the gain obtained in this case is quite small.


Enhanced plasmonic behavior of bimetallic (Ag-Au) multilayered spheres.

Peña-Rodríguez O, Pal U - Nanoscale Res Lett (2011)

Simulated extinction efficiency for Au-Au and Ag-Au DCN structures. Simulated extinction efficiency as a function of the wavelength for (a) Au-Au and (b) Ag-Au DCN structures, having t0 = t2 = 5 nm, while t1 and t3 are varied simultaneously (t1 = 2, ..., 14 nm; t3 = 16 nm - t1).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211343&req=5

Figure 4: Simulated extinction efficiency for Au-Au and Ag-Au DCN structures. Simulated extinction efficiency as a function of the wavelength for (a) Au-Au and (b) Ag-Au DCN structures, having t0 = t2 = 5 nm, while t1 and t3 are varied simultaneously (t1 = 2, ..., 14 nm; t3 = 16 nm - t1).
Mentions: The theoretical extinction efficiencies, calculated for fixed dielectric layers (5 nm) and the simultaneous inverse variations of t1 and t3 (t1 = 2, ..., 14 nm; t3 = 16 nm - t1) are shown in Figures 3 and 4 for the MDM and DCN structures, respectively. The spectra obtained as a function of t3 can be roughly divided into three regions. The first one corresponds to a very thin outer layer (below 5 nm); for which the and modes are widely separated. In this case, the position of the bonding (antibonding) mode of the composite structures is almost entirely controlled by the () mode. For this reason the bonding mode (the one we are interested in) is virtually identical for both compositions and the gain obtained in this case is quite small.

Bottom Line: In this article we study the plasmonic behavior of some stable, highly biocompatible bimetallic metal-dielectric-metal (MDM) and double concentric nanoshell (DCN) structures.By simply switching the material of the inner structure from Au to Ag, the intensity of their surface plasmon resonance could be increased in the optical transparency region of the human tissues up to 20 and 60 percent for the MDM and DCN, respectively, while the biocompatibility is retained.The obtained results indicate that these novel structures could be highly suitable for surface enhanced Raman scattering and photothermal cancer therapy.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, Barcelona, 08193, Spain. ovidio@bytesfall.com.

ABSTRACT
In this article we study the plasmonic behavior of some stable, highly biocompatible bimetallic metal-dielectric-metal (MDM) and double concentric nanoshell (DCN) structures. By simply switching the material of the inner structure from Au to Ag, the intensity of their surface plasmon resonance could be increased in the optical transparency region of the human tissues up to 20 and 60 percent for the MDM and DCN, respectively, while the biocompatibility is retained. The obtained results indicate that these novel structures could be highly suitable for surface enhanced Raman scattering and photothermal cancer therapy.

No MeSH data available.