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Versatile "click chemistry" approach to functionalizing silicon quantum dots: applications toward fluorescent
Xiaoyu Cheng1, Stuart B Lowe, Simone Ciampi
1School of Chemistry, ‡Australian Centre for Nanomedicine, ∥Centre for Vascular Research, and #School of Physics, University of New South Wales , Sydney, New South Wales 2052, Australia.
Langmuir : the ACS Journal of Surfaces and Colloids
|April 11, 2014
Summary
Researchers developed photostable silicon quantum dots (SiQDs) for cancer cell imaging. These modified SiQDs show excellent photostability and biocompatibility for bioimaging applications.
Area of Science:
- Materials Science
- Nanotechnology
- Biomedical Engineering
Background:
- Colloidal silicon quantum dots (SiQDs) offer promising photoluminescent properties for bioimaging.
- Developing photostable and biocompatible SiQDs is crucial for effective cellular imaging.
Purpose of the Study:
- To develop a solution procedure for preparing and surface-modifying photostable SiQDs.
- To functionalize SiQDs for enhanced dispersibility and photostability in biological environments.
- To evaluate the suitability of functionalized SiQDs for cancer cell imaging and assess their non-cytotoxicity.
Main Methods:
- Synthesis of photoluminescent SiQDs via reduction of halogenated silane precursors using a microemulsion process.
- Surface modification of SiQDs through UV-promoted hydrosilylation with 1,8-nonadiyne, followed by azide coupling.
- Characterization using Fourier transform infrared spectroscopy (FTIR).
- Assessment of photoluminescence stability and dispersibility in various solvents.
- Evaluation of biocompatibility through fluorescent imaging of HeLa cells and non-cytotoxicity assays.
Main Results:
- Successful grafting of 1,8-nonadiyne onto SiQD surfaces demonstrated by FTIR.
- Functionalized SiQDs exhibited dispersibility in polar and nonpolar solvents.
- Photoluminescence remained stable against photobleaching and within biological pH/temperature ranges.
- Water-soluble SiQDs enabled fluorescent imaging of HeLa cells.
- SiQDs showed no cytotoxicity at concentrations up to 240 μg/mL.
Conclusions:
- The developed solution procedure enables the preparation of versatile, photostable SiQDs.
- Surface functionalization enhances SiQD dispersibility and stability for biological applications.
- Functionalized SiQDs are suitable for fluorescent bioimaging of cancer cells with minimal toxicity.
