Carbon Dots/Iron Oxide Nanoparticles with Tuneable Composition and Properties

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Carbon dots (CDs) and iron oxide nanoparticles (NPs) are widely researched for various applications.
• Developing multifunctional nanomaterials with tunable properties remains a key challenge.

Purpose of the Study:

• To synthesize a novel family of carbon dots/iron oxide nanoparticles (C/Fe-NPs).
• To tune the elemental composition, optical, and magnetic properties of C/Fe-NPs.
• To evaluate the potential of C/Fe-NPs in bioimaging and antimicrobial applications.

Main Methods:

• A simple strategy involving thermal decomposition of iron (III) acetylacetonate in the presence of a carbon-rich precursor.
• Polyethylene glycol was used as a passivation agent.
• Varying molar ratios of reactants to control composition and properties.

Main Results:

• Synthesized C/Fe-NPs with tuneable elemental composition (C, H, O, N, Fe).
• Enhanced quantum yield from 6% to 9% with increased carbon content (27-36 wt%).
• Improved room temperature saturation magnetization from 4.1 to 17.7 emu/g with increased iron content (17-31 wt%).

Conclusions:

• The developed strategy offers a simple route to multifunctional C/Fe-NPs.
• C/Fe-NPs exhibit tuneable optical and magnetic properties.
• Promising potential for advanced diagnostic tools due to antimicrobial properties, low cytotoxicity, and bioimaging capabilities.