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

Authors
  • Dervisevic, Muamer1
  • Shi, Qianqian2
  • Alba, Maria1
  • Prieto-Simon, Beatriz3
  • Cheng, Wenlong4
  • Voelcker, Nicolas H5
  • 1 Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville 3052, Victoria, Australia; Commonwealth Scientific and Industrial Research Organization (CSIRO) Manufacturing, Clayton, VIC 3168, Australia. , (Australia)
  • 2 Department of Chemical Engineering, Faculty of Engineering, Monash University, Clayton 3800, Victoria, Australia. , (Australia)
  • 3 Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville 3052, Victoria, Australia; Commonwealth Scientific and Industrial Research Organization (CSIRO) Manufacturing, Clayton, VIC 3168, Australia; Department of Electronic Engineering, Universitat Rovira i Virgili, 43007 Tarragona, Spain. , (Australia)
  • 4 Department of Chemical Engineering, Faculty of Engineering, Monash University, Clayton 3800, Victoria, Australia; The Melbourne Centre for Nanofabrication, Victorian Node of the Australian National Fabrication Facility 151 Wellington Road, Clayton 3168, Victoria, Australia. , (Australia)
  • 5 Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville 3052, Victoria, Australia; Commonwealth Scientific and Industrial Research Organization (CSIRO) Manufacturing, Clayton, VIC 3168, Australia; The Melbourne Centre for Nanofabrication, Victorian Node of the Australian National Fabrication Facility 151 Wellington Road, Clayton 3168, Victoria, Australia; Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia. Electronic address: [email protected] , (Australia)
Type
Published Article
Journal
Journal of Colloid and Interface Science
Publisher
Elsevier
Publication Date
Sep 01, 2020
Volume
575
Pages
24–34
Identifiers
DOI: 10.1016/j.jcis.2020.04.081
PMID: 32344216
Source
Medline
Keywords
Language
English
License
Unknown

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 ([email protected]) was used for the detection of H2O2via its electrochemical reduction. The [email protected] 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 [email protected] sensor hence shows great potential in nonenzymatic electrochemical sensing. Copyright © 2020 Elsevier Inc. All rights reserved.

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