In situ deposition of MOF-74(Cu) nanosheet arrays onto carbon cloth to fabricate a sensitive and selective electrocatalytic biosensor and its application for the determination of glucose in human serum

Shuisheng Hu, Yuxia Lin, Jing Teng, Wing Leung Wong (Corresponding Author), Bin Qiu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)

Abstract

A new electrocatalytic biosensor (MOF-74(Cu) NS-CC) based on the in situ deposition of MOF-74(Cu) nanosheet on carbon cloth via a bottom-up synthetic approach in a glass tube was developed. The electrocatalytic activity of the deposited MOF-74(Cu) NS was demonstrated in the oxidation of glucose to gluconate under alkaline conditions. The results revealed that the proposed method of in situ formation of MOF-74(Cu) NS onto a carbon cloth surface in a multi-layer solution is capable to generate a stable MOF-74(Cu) NS-CC electrode with excellent sensing performance. When the as-synthesized MOF-74(Cu) NS-CC was applied directly as the working electrode for glucose sensing, it showed much higher conductivity and redox activity than MOF-74(Cu) NS-GCE. With the potential applied at 0.55 V (vs. Ag/AgCl), this new electrocatalytic biosensor exhibits an excellent linear relationship between current density and concentration of glucose. Moreover, a wide linear range of detection (1.0 to 1000 μM) was observed. The limit of detection was found to be 0.41 μM (S/N = 3). The response sensitivity is 3.35 mA mM−1 cm−2 when the concentration of glucose is in the range 1–100 μM and 3.81 mA mM−1 cm−2 for the 100–1000 μM concentration range. This study provides a low-cost, easy to prepare, and reproducible methodology for the synthesis of highly redox-active nanomaterials based on the in situ formation of two-dimensional MOF-74(Cu) NS for the development of new electrocatalytic biosensors. [Figure not available: see fulltext.]

Original languageEnglish
Article number670
JournalMicrochimica Acta
Volume187
Issue number12
DOIs
Publication statusPublished - Dec 2020

Keywords

  • Bottom-up synthesis
  • Carbon cloth
  • Electrochemical biosensor
  • Electrochemical catalysis
  • Glucose oxidation
  • Glucose sensor
  • In situ deposition
  • MOF-74(Cu)
  • Non-enzymatic method
  • Two-dimensional metal-organic framework nanosheet

ASJC Scopus subject areas

  • Analytical Chemistry

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