Synthesis of gold microstructures with surface nanoroughness using a deep eutectic solvent for catalytic and...

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Gold microparticles (AuMPs) are crucial for catalysis and diagnostics.
• Controlling AuMP size, shape, and surface properties is essential for optimizing performance.
• Developing cost-effective and scalable synthesis methods for AuMPs remains a challenge.

Purpose of the Study:

• To synthesize highly monodisperse gold microparticles (AuMPs) using a deep eutectic solvent (DES).
• To investigate the structural, optical, and catalytic properties of the synthesized AuMPs.
• To demonstrate the application of AuMPs as platforms for DNA detection in diagnostic applications.

Main Methods:

• Synthesis of AuMPs using choline chloride and malonic acid-based DES.
• Characterization using electron microscopy (internal and external structures).
• Evaluation of optical properties and catalytic activity (4-nitrophenol reduction).
• DNA functionalization and assembly with DNA-gold nanoparticle probes for colorimetric detection.

Main Results:

• Achieved highly monodisperse AuMPs with controlled diameters (micrometer range) and surface nanoroughness.
• Established a correlation between particle structure and optical properties.
• Demonstrated concentration-dependent catalytic activity of AuMPs.
• Successfully utilized DNA-functionalized AuMPs for reversible assembly and colorimetric DNA sequence detection.

Conclusions:

• Deep eutectic solvents (DES) are effective media for synthesizing tunable gold microparticles (AuMPs).
• Synthesized AuMPs possess controllable catalytic and optical properties suitable for diagnostic applications.
• DNA-functionalized AuMPs serve as versatile platforms for sensitive and rapid colorimetric detection of target DNA sequences.