Fluorescent silica nanoparticles with chemically reactive surface: Controlling spatial distribution in one-step...

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Encapsulating fluorescent dyes in silica nanoparticles enhances probe quality by protecting fluorophores from external factors and quenchers.
• Amine-functionalized nanoparticle surfaces offer versatile applications for biomolecule conjugation and targeted delivery.
• Conventional synthesis methods for such bifunctional nanoparticles are often multi-step and inefficient.

Purpose of the Study:

• To develop an efficient one-step synthesis for hybrid fluorescent silica nanoparticles.
• To simultaneously incorporate a fluorescent probe and amine functionalities.
• To characterize the spatial distribution of the dye and surface amine groups.

Main Methods:

• Co-condensation sol-gel synthesis.
• Chemical and morphological characterization using DRIFTS, XPS, SEM, and SAXS.
• Fluorescent property assessment via excitation-emission matrices and time-resolved experiments.

Main Results:

• A one-pot synthesis method was successfully developed for hybrid fluorescent silica nanoparticles.
• The synthesis enables simultaneous incorporation of fluorescein isothiocyanate (fluorescent probe) and amino groups.
• Characterization confirmed the spatial distribution of the dye within the ~100nm nanoparticles and the presence of reactive surface amine groups.

Conclusions:

• The developed one-pot sol-gel method provides an efficient route to bifunctional fluorescent silica nanoparticles.
• These nanoparticles offer protected fluorophores and functionalizable surfaces for advanced applications.
• The method allows precise control over the simultaneous incorporation of functionalities.