Rapid Cationization of Gold Nanoparticles by Two-Step Phase Transfer

Area of Science:

• Nanotechnology
• Materials Science
• Biomedical Engineering

Background:

• Cationic gold nanoparticles are promising for drug delivery and self-assembly.
• Synthesizing cationic gold nanoparticles larger than 5 nm has been a significant challenge.
• Larger particles offer enhanced plasmonic properties.

Purpose of the Study:

• To develop a method for synthesizing cationic gold nanoparticles with tunable sizes between 8-20 nm.
• To demonstrate the self-assembly capabilities of these larger cationic gold nanoparticles.

Main Methods:

• A rapid two-step phase-transfer protocol was employed.
• The synthesis started from simple citrate-capped gold nanoparticles.
• Tunable sizes ranging from 8-20 nm were achieved.

Main Results:

• The first reported synthesis of cationic gold nanoparticles in the 8-20 nm size range was achieved.
• These larger cationic gold nanoparticles exhibit tunable sizes.
• The particles were shown to form ordered self-assembled structures with negatively charged biological components via electrostatic interactions.

Conclusions:

• A novel and efficient method for producing larger cationic gold nanoparticles has been established.
• These nanoparticles are suitable for self-assembly with biological materials.
• The findings open new avenues for applications in drug delivery and nanomedicine.