ArticleJournal of the American Chemical Society2011
Femtosecond ligand/core dynamics of microwave-assisted synthesized silicon quantum dots in aqueous solution.
Article in Journal of the American Chemical Society, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed.
- Emerging 0D, 1D, 2D, and 3D nanostructures for efficient point-of-care biosensing.Biosensors & bioelectronics: X · 2022Article
- Microplasma-Enabled Surfaced-Functionalized Silicon Quantum Dots for Label-Free Detection of Dopamine.ACS omega · 2022Article
- Silicon Quantum Dots: Synthesis, Encapsulation, and Application in Light-Emitting Diodes.Frontiers in chemistry · 2020Review
- Zintl Phases as Reactive Precursors for Synthesis of Novel Silicon and Germanium-Based Materials.Materials (Basel, Switzerland) · 2019Review
- One-Pot Gram-Scale Synthesis of Hydrogen-Terminated Silicon Nanoparticles.Chemistry of materials : a publication of the American Chemical Society · 2018Article
- Silicon Nanomaterials for Biosensing and Bioimaging Analysis.Frontiers in chemistry · 2018Review
- Colloidal silicon quantum dots: synthesis and luminescence tuning from the near-UV to the near-IR range.Science and technology of advanced materials · 2014Review
- Functionalized silicon quantum dots by N-vinylcarbazole: synthesis and spectroscopic properties.Nanoscale research letters · 2014Article
- Chemical insight into the origin of red and blue photoluminescence arising from freestanding silicon nanocrystals.ACS nano · 2013Article
- Article
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Authors and funding
6 authors.
Funding
Abstract
A microwave-assisted reaction has been developed to produce hydrogen-terminated silicon quantum dots (QDs). The Si QDs were passivated for water solubility via two different methods: hydrosilylation produced 3-aminopropenyl-terminated Si QDs, and a modified Stöber process produced silica-encapsulated Si QDs. Both methods produce water-soluble QDs with maximum emission at 414 nm, and after purification, the QDs exhibit intrinsic fluorescence quantum yield efficiencies of 15 and 23%, respectively. Even though the QDs have different surfaces, they exhibit nearly identical absorption and fluorescence spectra. Femtosecond transient absorption spectroscopy was used for temporal resolution of the photoexcited carrier dynamics between the QDs and ligand. The transient dynamics of the 3-aminopropenyl-terminated Si QDs is interpreted as a formation and decay of a charge-transfer (CT) excited state between the delocalized π electrons of the carbon linker and the Si core excitons. This CT state is stable for ~4 ns before reverting back to a more stable, long-living species. The silica-encapsulated Si QDs show a simpler spectrum without CT dynamics.
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