Journal
NANOSCALE
Volume 14, Issue 44, Pages 16450-16457Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2nr03737h
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Funding
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT) [NRF-2017M3D1A1039287]
- POSCO
- NRF - MSIT, Republic of Korea [NRF-2018M3D1A1058997]
- Research Grants Council of Hong Kong [17208218, 17208919, 17204020]
- University of Hong Kong [201910159047, 202111159097]
- MSIT, Republic of Korea [NRF-2021R1C1C2011447]
- Ministry of Education (MOE), Republic of Korea [NRF-2021R1I1A1A01050424]
- Hyundai Motor Chung Mong-Koo fellowship
- NRF Ph.D. fellowship - MOE, Republic of Korea [NRF-2021R1A6A3A13038935]
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The study focuses on metallic nanoparticles supporting localized surface plasmons and their self-assembled clustering technique, proposing a micropipette-based self-assembly method for fabricating three-dimensional structures composed of colloidal clusters. Experimental demonstrations of the optical properties of these structures, as well as theoretical demonstrations of their localized surface plasmon resonance and thermo-plasmonic properties, were carried out.
Metallic nanoparticles that support localized surface plasmons have emerged as fundamental iconic building blocks for nanoscale photonics. Self-assembled clustering of plasmonic nanoparticles with controlled near-field interactions offers an interesting novel route to manipulate the electromagnetic fields at a subwavelength scale. Various bottom-up, self-assembly manners have been successfully devised to build plasmonic nanoparticle clusters displaying attractive optical properties. However, the incapability to configure on-demand architectures limits its practical reliability uses for scalable nanophotonic devices. Furthermore, a critical challenge has been addressing the accurate positioning of functional nanoparticles, including catalytic nanoparticles, dielectric nanoparticles, and quantum dots (QDs) in the clustered plasmonic hotspots. This work proposes a micropipette-based self-assembly method to fabricate three-dimensional architectures composed of colloidal clusters. The heterogeneous colloidal clusters comprising metallic nanoparticles and QDs are fabricated in one step by the micropipette-based self-assembly method. A plasmonic clustered pillar embedding QDs exhibited excellent photoluminescence characteristics compared to a collapsed pillar. The experimental and theoretical demonstration of the localized surface plasmon resonance and thermo-plasmonic properties of the colloidal clusters was performed.
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