A composite prepared from BiOBr and gold nanoparticles with electron sink and hot-electron donor properties for photoelectrochemical aptasensing of tetracycline

Mikrochim Acta. 2019 Nov 16;186(12):794. doi: 10.1007/s00604-019-3954-z.

Abstract

A photoelectrochemical (PEC) aptasensor is described for detecting tetracycline (TC). A gold nanoparticles/BiOBr (AuNPs/BiOBr) composite was prepared where the AuNPs play a key function in carrier transfer which is ascribed to the wavelength-dependent dual function as an electron sink and as a hot-electron donor. Due to this dual function, the composite exhibits a wide photo-response and high electron transfer efficiency. This results in enormously enhanced PEC response. The TC-aptamer was immobilized on an ITO modified with AuNPs/BiOBr via Au-S covalent bonding. The resulting PEC aptasensor possesses a wide linear range (1-104 ng L-1) and a low detection limit (0.35 ng L-1; at S/N = 3). Graphical abstractSchematic representation of a photoelectrochemical aptasensor for tetracycline based on the use of a AuNP/BiOBr composite with electron sink and hot-electron donor properties of the gold nanoparticles.

Keywords: Aptamer; AuNPs; BiOBr; Dual function; Electron sink; Hot-electron donor; Photoelectrochemistry; SPR; Sensor; Tetracycline.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anti-Bacterial Agents / analysis
  • Anti-Bacterial Agents / chemistry
  • Aptamers, Nucleotide / chemistry*
  • Biosensing Techniques / methods*
  • Bismuth / chemistry*
  • Electrochemical Techniques / methods*
  • Gold / chemistry
  • Limit of Detection
  • Metal Nanoparticles / chemistry*
  • Nanocomposites / chemistry
  • Nanocomposites / radiation effects
  • Reproducibility of Results
  • Tetracycline / analysis*
  • Tetracycline / chemistry
  • Ultraviolet Rays

Substances

  • Anti-Bacterial Agents
  • Aptamers, Nucleotide
  • Gold
  • Tetracycline
  • bismuth oxybromide
  • Bismuth