Cationic carbon dot-silver nanohybrids with enhanced stability and redox control

Area of Science:

• Nanotechnology
• Materials Science
• Biomedical Engineering

Background:

• Silver nanoparticles (AgNPs) offer therapeutic potential but suffer from poor stability.
• Functional stability is crucial for AgNP efficacy in biomedical settings.
• Existing synthesis methods often yield AgNPs susceptible to degradation.

Purpose of the Study:

• To develop highly stable AgNPs using a green synthesis approach.
• To investigate the stability and antioxidant properties of novel carbon dot-silver nanoparticle hybrids (CDs-AgNPs).
• To compare the performance of CDs-AgNPs against conventionally synthesized AgNPs.

Main Methods:

• Photochemical synthesis of AgNPs using carbon dots (CDs) as reducing and capping agents.
• Comparative stability assessments across various pH, ionic strengths, and oxidative conditions.
• In vitro cytotoxicity assays on cancerous and non-cancerous cell lines.

Main Results:

• CDs-AgNPs exhibited superior colloidal stability compared to traditional AgNPs.
• The carbon dot shell protected AgNPs from clumping and oxidation, enhancing antioxidant capacity.
• CDs-AgNPs demonstrated dose-dependent cytotoxicity, with enhanced activity possibly due to a pro-oxidant mechanism.

Conclusions:

• A green and reproducible method for creating stable carbon-silver nanohybrids (CDs-AgNPs) was established.
• The enhanced stability and redox control of CDs-AgNPs address key limitations of metallic nanomaterials.
• This hybrid nanostructure presents a promising platform for advanced therapeutic applications.