Enzymatic and non-enzymatic electrochemical glucose sensor based on carbon nano-onions

Jeotikanta Mohapatra, Balakrishna Ananthoju, Vishnu Nair, Arijit Mitra, D. Bahadur, N. V. Medhekar, M. Aslam

Research output: Contribution to journalArticleResearchpeer-review

51 Citations (Scopus)

Abstract

A high sensitive glucose sensing characteristic has been realized in carbon nano-onions (CNOs). The CNOs of mean size 30 nm were synthesized by an energy-efficient, simple and inexpensive combustion technique. These as-synthesized CNOs could be employed as an electrochemical sensor by covalently immobilizing the glucose oxidase enzyme on them via carbodiimide chemistry. The sensitivity achieved by such a sensor is 26.5 µA mM−1 cm−2 with a linear response in the range of 1–10 mM glucose. Further to improve the catalytic activity of the CNOs and also to make them enzyme free, platinum nanoparticles of average size 2.5 nm are decorated on CNOs. This sensor fabricated using Pt-decorated CNOs (Pt@CNOs) nanostructure has shown an enhanced sensitivity of 21.6 µA mM−1 cm−2 with an extended linear response in the range of 2–28 mM glucose. Through these attempts we demonstrate CNOs as a versatile biosensing platform.

Original languageEnglish
Pages (from-to)332-341
Number of pages10
JournalApplied Surface Science
Volume442
DOIs
Publication statusPublished - 1 Jun 2018

Keywords

  • Carbon materials
  • Carbon onions
  • Flame synthesis
  • Glucose sensor

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