A porous carbon nitride modified with cobalt phosphide as an efficient visible-light harvesting nanocomposite for photoelectrochemical enzymatic sensing of glucose

Mikrochim Acta. 2019 Nov 29;186(12):856. doi: 10.1007/s00604-019-3929-0.

Abstract

A porous carbon nitride (PCN) modified with cobalt phosphides (CoP) was synthesized. In this nanocomposite, the CoP (in different weight fractions) serves (a) as the electron acceptor to accelerate the photoinduced charge separation, and (b) as the photosensitizer to increase the photoelectrochemical (PEC) response to visible light. Dissolved oxygen acts as the electron acceptor to generate PEC current. If glucose oxidase (GOx) catalyzes the oxidation of glucose, dissolved oxygen is consumed. This leads to the suppression of photocurrent. The photocathode biosensor has a linear response in the 0.05 to 0.7 mM glucose concentration range and a 1.1 μM limit of detection. Graphical abstractSchematic of a photoelectrochemical glucose biosensor based on the use of cobalt phosphide-modified porous carbon nitrides. PCN: porous carbon nitride; CoP: cobalt phosphide.

Keywords: CoP; Electron acceptor; Oxygen; Photocathode; Visible light.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biocatalysis
  • Biosensing Techniques
  • Electrochemical Techniques
  • Glucose / analysis*
  • Glucose / metabolism
  • Glucose Oxidase / metabolism*
  • Light*
  • Nanocomposites / chemistry*
  • Nitriles / chemistry*
  • Particle Size
  • Phosphines / chemistry*
  • Photochemical Processes
  • Porosity
  • Surface Properties

Substances

  • Nitriles
  • Phosphines
  • cobalt phosphide
  • cyanogen
  • Glucose Oxidase
  • Glucose