Abstract
We used DNA self-assembly methods to fabricate a series of core-shell gold nanoparticle-DNA-colloidal quantum dot (AuNP-DNA-Qdot) nanoclusters with satellite-like architecture to modulate optical (photoluminescence) response. By varying the intercomponent distance through the DNA linker length designs, we demonstrate precise tuning of the plasmon-exciton interaction and the optical behavior of the nanoclusters from regimes characterized by photoluminescence quenching to photoluminescence enhancement. The combination of detailed X-ray scattering probing with photoluminescence intensity and lifetime studies revealed the relation between the cluster structure and its optical output. Compared to conventional light-harvesting systems like conjugated polymers and multichromophoric dendrimers, the proposed nanoclusters bring enhanced flexibility in controlling the optical behavior toward a desired application, and they can be regarded as controllable optical switches via the optically pumped color.
Original language | English (US) |
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Pages (from-to) | 5657-5665 |
Number of pages | 9 |
Journal | ACS nano |
Volume | 9 |
Issue number | 6 |
DOIs | |
State | Published - Jun 23 2015 |
Bibliographical note
Publisher Copyright:© 2015 American Chemical Society.
Keywords
- DNA
- cluster
- fluorescence
- nanoparticle
- quantum dots
- self-assembly