Gold nanostar synthesis with a silver seed mediated growth method

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Nano-scale colloids' properties depend on composition, size, and shape.
• Gold nano-colloids are of interest for biomedical applications due to low toxicity.
• Surface plasmon resonance (SPR) in metal nano-colloids is crucial for light interaction.

Purpose of the Study:

• To develop a method for synthesizing star-shaped gold nanoparticles (nanostars).
• To achieve a peak surface plasmon resonance in the near-infrared (NIR) region for enhanced tissue penetration.
• To produce gold nanostars suitable for biomedical applications, especially photo-thermal ablation.

Main Methods:

• Synthesis of gold nanostars using silver seeds as nucleating agents for anisotropic growth.
• Utilizing a solution-based method for controlled nanoparticle formation.
• Characterization of the synthesized nanoparticles using Scanning Electron Microscopy (SEM).

Main Results:

• Successfully synthesized star-shaped gold nanoparticles (nanostars).
• SEM analysis confirmed that 70% of the nanostructures were nanostars, with the remainder being amorphous clusters.
• The synthesized nanostars exhibited an absorbance peak at 840 nm in the NIR region.

Conclusions:

• The developed method effectively produces gold nanostars with desirable optical properties.
• The NIR absorbance peak makes these gold nanostars suitable for biomedical applications.
• The nanostars are particularly promising for photo-thermal ablation therapies.