PDMS-gold nanocomposite platforms with enhanced sensing properties.

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Poly(dimethyl siloxane) (PDMS) is a versatile elastomer.
• Gold nanoparticles (AuNPs) offer unique optical and electronic properties.
• Developing elastic nanocomposites for sensitive biosensing remains a challenge.

Purpose of the Study:

• To fabricate highly elastic gold-poly(dimethyl siloxane) (Au-PDMS) nanocomposite films.
• To investigate the effect of post-fabrication treatments on material properties and sensing capabilities.
• To evaluate the performance of Au-PDMS films in biosensing applications, particularly for antigen-antibody interactions.

Main Methods:

• Novel in-situ method using chloroauric acid in ethanol solution for Au-PDMS nanocomposite synthesis.
• Heat treatment and mechanical swelling/shrinkage cycles to modify film morphology and porosity.
• Characterization of material properties, including porosity and mechanical characteristics.
• Biosensing experiments utilizing antigen-antibody interactions to assess sensitivity.

Main Results:

• Fabrication of Au-PDMS nanocomposite films with high elasticity.
• Enhanced free volume and improved biosensing capability after heat treatment and mechanical swelling.
• Highest sensitivity (approx. 70 nm/RIU) achieved for annealed and toluene-swollen samples.
• Demonstrated high sensitivity in biosensing experiments for antigen-antibody interactions.

Conclusions:

• The developed Au-PDMS nanocomposite films exhibit excellent elasticity and improved biosensing performance.
• Post-fabrication treatments are crucial for optimizing material properties for enhanced sensitivity.
• These materials show significant potential for sensitive biosensing in microfluidic environments.