Zero-Dimensional/Two-Dimensional AuxPd100- x Nanocomposites with Enhanced Nanozyme Catalysis for Sensitive Glucose Detection

ACS Appl Mater Interfaces. 2020 Mar 11;12(10):11616-11624. doi: 10.1021/acsami.9b21621. Epub 2020 Feb 28.

Abstract

Here, we report facile fabrication of two-dimensional (2D) Pd nanosheet (NS)-supported zero-dimensional (0D) Au nanoparticles via galvanic replacement. In the synthesis, the surface-clean Pd NSs premade not only acted as a sacrifice template for replacing Pd atoms by Au3+ ions, but served as a support substrate to support Au nanoparticles. The morphology, structure, and composition of products relied on the Au/Pd feed atomic ratio. Interestingly, the as-obtained 0D/2D AuxPd100-x (x = 4.5, 9.8, and 21) nanocomposites showed remarkably enhanced peroxidase-mimic catalysis in the model oxidation reaction, which followed the typical Michaelis-Menten theory. Compared to Pd NSs, the enhanced catalysis of AuxPd100-x was closely related to both the increased specific surface area and the modified electronic structure of Pd NSs, which resulted in a change in the catalytic pathway, that is, from hydroxyl radical generation to rapid electron transfer. The work provides a simple yet efficient avenue to build highly efficient heterogeneous catalysts based on metallic NSs, as exemplified by the superior nanozyme activity of 0D/2D bimetallic nanostructures for glucose detection.

Keywords: catalysis; galvanic; glucose detection; nanozyme; palladium.

MeSH terms

  • Biosensing Techniques / methods
  • Blood Glucose / analysis*
  • Catalysis
  • Electrons
  • Glucose Oxidase / chemistry
  • Glucose Oxidase / metabolism
  • Gold / chemistry
  • Humans
  • Nanocomposites / chemistry*
  • Palladium / chemistry*

Substances

  • Blood Glucose
  • Palladium
  • Gold
  • Glucose Oxidase