Achieving enhanced peroxidase-like activity in multimetallic nanorattles

Area of Science:

• Nanotechnology
• Catalysis
• Biochemistry

Background:

• Gold nanoparticles (Au NPs) are widely used as artificial enzymes but have performance limitations.
• Developing advanced nanomaterials is crucial for improving artificial enzyme efficacy.

Purpose of the Study:

• To synthesize and characterize multimetallic nanorattles (Au@AgAu NRs) with a void for enhanced peroxidase-like activity.
• To investigate the catalytic performance and kinetics of these nanorattles compared to conventional Au NPs.

Main Methods:

• Synthesis of Au@AgAu NRs via a galvanic replacement approach.
• Evaluation of peroxidase-like activity using TMB oxidation.
• Kinetic analysis including Michaelis constant (K_m) determination.
• Exploration of hydrogen peroxide (H2O2) sensing capabilities.

Main Results:

• Au@AgAu NRs demonstrated a 152-fold increase in activity compared to conventional Au NPs.
• The nanorattles exhibited a lower K_m, indicating superior substrate interaction and product formation.
• A linear correlation was observed between product concentration and H2O2 concentration, enabling colorimetric sensing.

Conclusions:

• The enhanced performance of Au@AgAu NRs is attributed to increased surface area, active sites, and nanoconfinement effects.
• These nanorattles represent a significant advancement in artificial enzyme design beyond conventional nanoparticles.
• The findings provide insights for developing high-performance artificial enzymes and H2O2 sensing platforms.