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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Core-Shell Gold Nanoparticles@Pd-Loaded Covalent Organic Framework for In Situ Surface-Enhanced Raman Spectroscopy

Wen-Fei Huang1, Han-Bin Xu1, Shi-Cheng Zhu1

  • 1Key Laboratory for Advanced Materials, Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry & Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China.

ACS Sensors
|April 22, 2024
PubMed
Summary

A novel core-shell nanostructure combining gold nanoparticles and a covalent organic framework with palladium nanoparticles enables rapid monitoring of catalytic reactions using SERS. This design enhances catalytic activity and reusability for various chemical transformations.

Keywords:
SERScore−shell nanostructurecovalent organic frameworkinterfacial catalysiskinetics

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Area of Science:

  • Nanomaterials Science
  • Catalysis
  • Spectroscopy

Background:

  • Monitoring catalytic reactions often requires sensitive and efficient analytical techniques.
  • Core-shell nanostructures offer unique properties for catalysis and sensing applications.
  • Covalent organic frameworks (COFs) provide tunable environments for nanoparticle synthesis and stabilization.

Purpose of the Study:

  • To design and synthesize a core-shell nanostructure of gold nanoparticles@covalent organic framework loaded with palladium nanoparticles (AuNPs@COF-PdNPs).
  • To utilize this nanostructure for rapid monitoring of catalytic reactions via surface-enhanced Raman spectroscopy (SERS).
  • To investigate the catalytic performance and reusability of the developed nanostructure.

Main Methods:

  • Fabrication of AuNPs@COF-PdNPs core-shell nanostructure via COF coating on AuNPs and in situ PdNP synthesis.
  • Characterization of the nanostructure using SERS for monitoring catalytic processes.
  • Evaluation of catalytic activity in hydrogenation reduction and Suzuki-Miyaura coupling reactions.

Main Results:

  • The COF shell confined PdNPs, leading to high dispersity and enhanced catalytic activity.
  • AuNPs@COF-PdNPs demonstrated a 10-fold increase in reaction rate for hydrogenation compared to Au/Pd NPs.
  • Excellent reusability and high total conversion rates were achieved due to the protective COF layer and avoided intermediate products.

Conclusions:

  • The developed AuNPs@COF-PdNPs core-shell nanostructure is effective for SERS-based monitoring of catalytic reactions.
  • The nanostructure exhibits superior catalytic performance, stability, and reusability.
  • This platform holds significant potential for exploring catalytic processes and interfacial reactions.