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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 MDM and DCN structures of various compositions. Simulated extinction efficiency as a function of the wavelength for (a) MDM and (b) DCN structures with a fixed thickness of 5 nm in all of its layers (for the MDM r0 = t0 = 0). Black, red, blue, and green lines correspond to the Au-Au, Ag-Au, Au-Ag, and Ag-Ag compositions, respectively.
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Figure 2: Simulated extinction efficiency for MDM and DCN structures of various compositions. Simulated extinction efficiency as a function of the wavelength for (a) MDM and (b) DCN structures with a fixed thickness of 5 nm in all of its layers (for the MDM r0 = t0 = 0). Black, red, blue, and green lines correspond to the Au-Au, Ag-Au, Au-Ag, and Ag-Ag compositions, respectively.

Mentions: The wavelength variations of extinction efficiency (Qext) for MDM and DCN structures of different compositions with a fixed thickness of 5 nm for all of its layers and embedded in water (n = 1.33) are shown in Figure 2. It can be seen that, with respect to the equivalent Au-only structures, the Au-Ag and Ag-only configurations have a more intense energy mode, but the mode is considerably less intense and blue-shifted. Additionally, the last two configurations are not advantageous for practical applications, due to the poor stability and biocompatibility of silver. On the other hand, the Ag-Au configuration with a more intense energy mode retains the advantages of Au structures, due to outer Au layer. The only drawback of the latter structures is a slight blue-shift of energy mode, which could easily be corrected by adjusting their geometrical parameters [22,23]. Considering these findings, we restrict our further studies only to the gains obtained by using the configurations containing Ag and Au at the inner and outer metallic shell, respectively, instead of their Au-only counterparts.


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

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

Simulated extinction efficiency for MDM and DCN structures of various compositions. Simulated extinction efficiency as a function of the wavelength for (a) MDM and (b) DCN structures with a fixed thickness of 5 nm in all of its layers (for the MDM r0 = t0 = 0). Black, red, blue, and green lines correspond to the Au-Au, Ag-Au, Au-Ag, and Ag-Ag compositions, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: Simulated extinction efficiency for MDM and DCN structures of various compositions. Simulated extinction efficiency as a function of the wavelength for (a) MDM and (b) DCN structures with a fixed thickness of 5 nm in all of its layers (for the MDM r0 = t0 = 0). Black, red, blue, and green lines correspond to the Au-Au, Ag-Au, Au-Ag, and Ag-Ag compositions, respectively.
Mentions: The wavelength variations of extinction efficiency (Qext) for MDM and DCN structures of different compositions with a fixed thickness of 5 nm for all of its layers and embedded in water (n = 1.33) are shown in Figure 2. It can be seen that, with respect to the equivalent Au-only structures, the Au-Ag and Ag-only configurations have a more intense energy mode, but the mode is considerably less intense and blue-shifted. Additionally, the last two configurations are not advantageous for practical applications, due to the poor stability and biocompatibility of silver. On the other hand, the Ag-Au configuration with a more intense energy mode retains the advantages of Au structures, due to outer Au layer. The only drawback of the latter structures is a slight blue-shift of energy mode, which could easily be corrected by adjusting their geometrical parameters [22,23]. Considering these findings, we restrict our further studies only to the gains obtained by using the configurations containing Ag and Au at the inner and outer metallic shell, respectively, instead of their Au-only counterparts.

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.