Decoration of reduced graphene oxide with rhodium nanoparticles for the design of a sensitive electrochemical enzyme biosensor for 17β-estradiol

Biosens Bioelectron. 2017 Mar 15;89(Pt 1):343-351. doi: 10.1016/j.bios.2016.07.018. Epub 2016 Jul 7.


A novel nanocomposite material consisting of reduced graphene oxide/Rh nanoparticles was prepared by a one-pot reaction process. The strategy involved the simultaneous reduction of RhCl3 and graphene oxide with NaBH4 and the in situ deposition of the metal nanoparticles on the 2D carbon nanomaterial planar sheets. Glassy carbon electrode coated with this nanocomposite was employed as nanostructured support for the cross-linking of the enzyme laccase with glutaraldehyde to construct a voltammperometric biosensor for 17β-estradiol in the 0.9-11 pM range. The biosensor showed excellent analytical performance with high sensitivity of 25.7AµM-1cm-1, a very low detection limit of 0.54pM and high selectivity. The biosensor was applied to the rapid and successful determination of the hormone in spiked synthetic and real human urine samples.

Keywords: 17β-estradiol; Biosensor; Graphene oxide; Nanocomposite material; Rhodium nanoparticles.

Publication types

  • Evaluation Study

MeSH terms

  • Biosensing Techniques / methods*
  • Electrochemical Techniques / methods
  • Estradiol / urine*
  • Graphite / chemistry*
  • Humans
  • Laccase / chemistry
  • Metal Nanoparticles / chemistry
  • Metal Nanoparticles / ultrastructure
  • Models, Molecular
  • Nanocomposites / chemistry*
  • Nanocomposites / ultrastructure
  • Oxidation-Reduction
  • Oxides / chemistry
  • Rhodium / chemistry*
  • Trametes / enzymology
  • Transducers


  • Oxides
  • Estradiol
  • Graphite
  • Rhodium
  • Laccase