Journal of Applied Electrochemistry

, Volume 44, Issue 2, pp 263–277 | Cite as

Modification of well-aligned carbon nanotubes with dihexadecyl hydrogen phosphate: application to highly sensitive nanomolar detection of simvastatin

  • H. Fayazfar
  • A. Afshar
  • A. DolatiEmail author
  • M. Ghalkhani
Research Article


The first usage of dihexadecyl hydrogen phosphate (DHP)-modified highly oriented multi-walled carbon nanotube (MWCNTs) forests in a sensor configuration was developed to investigate the electrochemical oxidation and determination of simvastatin (SV) in pharmaceutical dosage forms. Synthesis of well-aligned MWCNTs on a conductive Ta substrate by catalytic vapor deposition technique using a common chemical, ethylenediamine, and without being plasma-aided was reported. The electrochemical behavior and oxidation of SV at the aligned MWCNTs/DHP/Ta electrode were discussed in detail through cyclic voltammetry and differential pulse voltammetry. This modified electrode showed considerably higher electrocatalytic activity for SV than bare Ta electrode or entangled MWCNTs powder electrode, due to presence of the alignment and mutual separation of CNTs. Under the optimal conditions, the A-MWCNTs/DHP/Ta-modified electrode showed a wide linear range from 0.01 to 1 μM with a detection limit of 0.01 nM demonstrating promising results for the future usage in clinical applications.


Voltammetry Electrochemical oxidation Simvastatin Sensors Multi-walled carbon nanotube 


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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • H. Fayazfar
    • 1
  • A. Afshar
    • 1
  • A. Dolati
    • 1
    Email author
  • M. Ghalkhani
    • 2
  1. 1.Materials Science and Engineering DepartmentSharif University of TechnologyTehranIran
  2. 2.Department of Chemistry, Faculty of ScienceShahid Rajaee Teacher Training UniversityLavizan, TehranIran

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