NDLI: Au/SiO$_{2}$/QD core/shell/shell nanostructures with plasmonic-enhanced photoluminescence

Content Provider	Springer Nature Link
Author	Yang, Ping Kawasaki, Kazuri Ando, Masari Murase, rio
Copyright Year	2012
Abstract	A sol–gel method has been developed to fabricate Au/SiO$_{2}$/quantum dot (QD) core–shell–shell nanostructures with plasmonic-enhanced photoluminescence (PL). Au nanoparticle (NP) was homogeneously coated with a SiO$_{2}$ shell with adjusted thickness through a Stöber synthesis. When the toluene solution of hydrophobic CdSe/ZnS QDs was mixed with partially hydrolyzed 3-aminopropyltrimethoxysilane (APS) sol, the ligands on the QDs were replaced by a thin functional SiO$_{2}$ layer because the amino group in partially hydrolyzed APS has strong binding interaction with the QDs. Partially hydrolyzed APS plays an important role as a thin functional layer for the transfers of QDs to water phase and the subsequent connection to aqueous SiO$_{2}$-coated Au NPs. Although Au NPs were demonstrated as efficient PL quenchers when the SiO$_{2}$ shell on the Au NPs is thin (less than 5 nm), we found that precise control of the spacing between the Au NP core and the QD shell resulted in QDs with an enhancement of 30 % of PL efficiency. The Au/SiO$_{2}$/QD core/shell/shell nanostructures also reveal strong surface plasmon scattering, which makes the Au/SiO/QD core–shell–shell nanostructures an excellent dual-modality imaging probe. This technology can serve as a general route for encapsulating a variety of discrete nanomaterials because monodispersed nanostructures often have a similar surface chemistry.
Starting Page	1
Ending Page	11
Page Count	11
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	14
Issue Number	9
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-08-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Quantum dot Au Nanoparticle Plasmon Photoluminescence Enhancement Sol–gel method Physical Chemistry Inorganic Chemistry Optics, Optoelectronics, Plasmonics and Optical Devices Characterization and Evaluation of Materials Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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