Highly selective nanostructured electrochemical sensor utilizing densely packed ultrathin gold nanowires film

Esma Dervisevic, Muamer Dervisevic, Yan Wang, Luis F. Malaver-Ortega, Wenlong Cheng, Kellie L. Tuck, Nicolas H. Voelcker, Victor J. Cadarso

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The number of studies conducted about nonenzymatic electrochemical sensors has increased in recent years due to the development of more stable and robust electrodes using noble metals. One of the key aspects for achieving high sensing performance including detection limit and sensitivity is the design of electrode architecture. Herein, we report a new electrochemical sensing platform featuring ultrathin standing gold nanowires (AuNWs) for nonenzymatic detection of hydrogen peroxide (H2O2). The use of AuNWs resulted in an increased electron transfer efficiency due to the higher active surface area compared to traditional gold film electrodes. This sensor demonstrates good selectivity, reproducibility, a linear range up to 49.5 mM of H2O2 with a sensitivity of 0.185±0.003 mAmM−1cm−2 and a limit of detection of 111 μM. The biological relevance of this sensor was tested in cell culture media to illustrate the performance of the proposed sensing electrode in complex biological media.

Original languageEnglish
Pages (from-to)1850-1858
Number of pages9
JournalElectroanalysis
Volume32
Issue number8
DOIs
Publication statusPublished - Aug 2020

Keywords

  • hydrogen peroxide
  • nonenzymatic electrochemical sensor.
  • reactive oxygen species
  • standing gold nanowires

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