Enzyme-like electrocatalysis from 2D gold nanograss-nanocube assemblies

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Nanotechnology's rapid development of nanostructured materials with disruptive material properties has inspired research for their use as electrocatalysts to potentially substitute enzymes. Herein, a novel electrocatalytic nanomaterial was constructed by growing gold nanograss (AuNG) on 2D nanoassemblies of gold nanocubes (AuNC). The resulting structure (NG@NC) was used for the detection of H2O2 via its electrochemical reduction. The NG@NC electrode displayed a large active surface area, resulting in improved electron transfer efficiency. On the nanoscale, AuNG maintained its structure, providing high stability and reproducibility of the sensing platform. Our nanostructured electrode showed excellent catalytic activity towards H2O2 at an applied potential of −0.5 V vs Ag/AgCl. This facilitated H2O2 detection with excellent selectivity in an environment like human urine, and a linear response from 50 µM to 30 mM, with a sensitivity of 100.66 ± 4.0 μA mM−1 cm−2. The NG@NC-based sensor hence shows great potential in nonenzymatic electrochemical sensing.

Original languageEnglish
Pages (from-to)24-34
Number of pages11
JournalJournal of Colloid and Interface Science
Volume575
DOIs
Publication statusPublished - 1 Sep 2020

Keywords

  • Electrocatalyst
  • Electrochemical nonenzymatic sensor
  • Gold nanostructure
  • Hydrogen peroxide
  • Nanomaterials

Cite this