Journal
ACS NANO
Volume 7, Issue 10, Pages 9064-9074Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn403671q
Keywords
gold nanorods; quantum dots; plasmon-exciton; controlled spacing; position; directed assembly; large-scale
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Funding
- Materials and Manufacturing Directorate
- Air Force Office of Scientific Research
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Tailoring the efficiency of fluorescent emission via plasmon-exciton coupling requires structure control on a nanometer length scale using a high-yield fabrication route not achievable with current lithographic techniques. These systems can be fabricated using a bottom-up approach if problems of colloidal stability and low yield can be addressed. We report progress on this pathway with the assembly of quantum dots (emitter) on gold nanorods (plasmonic units) with precisely controlled spacing, quantum dot/nanorod ratio, and long-term colloidal stability, which enables the purification and encapsulation of the assembled architecture in a protective silica shell. Overall, such controllability with nanometer precision allows one to synthesize stable, complex architectures at large volume in a rational and controllable manner. The assembled architectures demonstrate photoluminescent enhancement (5 x) useful for applications ranging from biological sensing to advanced optical communication.
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