Zero-Dimensional/Two-Dimensional AuPd100- Nanocomposites with Enhanced Nanozyme Catalysis for Sensitive Glucose
Shuangfei Cai1, Zhao Fu1, Wei Xiao1
1CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Center of Materials Science and Optoelectronics Engineering, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, China.
ACS Applied Materials & Interfaces
|February 19, 2020
Summary
We developed a simple method to create 2D palladium nanosheets decorated with 0D gold nanoparticles. These nanocomposites show enhanced peroxidase-mimic catalysis, offering a new route for efficient heterogeneous catalysts.
Area of Science:
- Materials Science
- Nanotechnology
- Catalysis
Background:
- Two-dimensional (2D) nanomaterials offer unique properties for catalysis.
- Noble metal nanoparticles are crucial components in catalytic systems.
- Developing efficient heterogeneous catalysts is essential for various chemical processes.
Purpose of the Study:
- To fabricate 0D/2D bimetallic nanocomposites of gold nanoparticles on palladium nanosheets.
- To investigate the catalytic activity of these nanocomposites as nanozymes.
- To understand the structure-activity relationship governing their enhanced performance.
Main Methods:
- Facile synthesis of 2D palladium nanosheets (NSs) via galvanic replacement.
- Decoration of Pd NSs with zero-dimensional (0D) gold (Au) nanoparticles.
- Characterization of morphology, structure, and composition using varying Au/Pd ratios.
- Evaluation of peroxidase-mimic catalytic activity using a model oxidation reaction.
Main Results:
- Successfully synthesized 0D/2D AuPd100- nanocomposites with controlled composition (x = 4.5, 9.8, 21).
- Demonstrated remarkably enhanced peroxidase-mimic catalysis compared to pristine Pd NSs.
- Observed catalysis following Michaelis-Menten kinetics.
- Attributed enhanced activity to increased specific surface area and modified electronic structure of Pd NSs, leading to a shift in catalytic pathway.
Conclusions:
- The study presents an efficient method for fabricating 0D/2D bimetallic nanostructures.
- The AuPd100- nanocomposites exhibit superior nanozyme activity, particularly for glucose detection.
- This approach provides a versatile platform for developing highly efficient heterogeneous catalysts based on metallic nanosheets.
