Journal
ADVANCED HEALTHCARE MATERIALS
Volume 3, Issue 10, Pages 1620-1628Publisher
WILEY
DOI: 10.1002/adhm.201400053
Keywords
core-shell; yolk-shell; mesoporous materials; plasmonic nanostructures; surface-enhanced Raman scattering; photothermal therapy
Funding
- NSFC [21322508, 21101029, 21273041, 21210004]
- China National Key Basic Research Program (973 Project) [2013CB934101, 2013CB934104, 2012CB224805, 2010CB933901]
- Shanghai Rising-Star Program [12QA1400400]
- State Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRF12001]
- NPST program by King Saud University [12-NAN2544-02]
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The design and fabrication of core-shell and yolk-shell nanostructures with surface plasmon resonance (SPR)-active center protected by permeable mesoporous channels can raise the new vitality into the catalysis and biological applications. Hybrid plasmonic-mesoporous silica nanocarriers consisting of Ag and Au-Ag alloy nanoparticles are fabricated through spatially confined galvanic replacement approach. The plasmonic absorption peaks can be finely controlled to the near-infrared (NIR) region (500-790 nm) that is beneficial for tissue transmittance. The mesoporous silica shell facilitates also protection of Au-Ag cores and affords the channels between the exterior and interior capsule environments, thereby endowing the multiple applications. In the present work, it is successfully demonstrated that mesoporous silica-coated Au-Ag alloy core-shell and yolk-shell nanocarriers can serve as good substrates for surface-enhanced Raman scattering (SERS) detection. The SERS signal intensities of nanocarriers are highly dependent on the SPR peaks and the contents of gold. Simultaneously, the synthesized Au-Ag@mSiO(2) nanocarriers with SPR peak at approximate to 790 nm can be applied in NIR-sensitive SERS detection and photothermal therapy.
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