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  Chemical Sensors 2012, 2: 8
  Research Article
Fe modified ZnO based mediator-less biosensor
  Monika Tomara, Shibu Sahab, Kashima Arorab, Vinay Guptab  
a Department of Physics, Miranda House, University of Delhi, Delhi 110007, India
b Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India

  An efficient glucose biosensor has been realized using an iron (Fe) modified Zinc oxide (ZnO) thin film matrix deposited onto ITO coated corning glass substrates by pulsed laser deposition (PLD) technique. For in-vivo application mediators are not suitable, so the dopant (Iron) having redox properties has been incorporated into ZnO matrix thus making the matrix suitable for biosensing application without using any external mediator in the buffer solution. The sensitivity of the Fe doped matrix (0.2 μAmM-1cm-2) is found to be much higher as compared to the composite matrix of ZnO having potassium ferricyanide mediator (0.08 μAmM-1cm-2), hence getting rid of harmful cyanide and proving the fact that Fe is responsible for electron communication feature in the ZnO matrix. The sensitivity of Fe implanted ZnO thin film matrix (0.33 μAmM-1cm-2) is higher in comparison to that of Fe doped ZnO film (0.2 μAmM-1cm-2) which indicates that the Fe implanted ZnO thin film matrix provides the best path for electron transfer from active enzymatic sites to the external circuit.
  ZnO; Glucose; Biosensor; Thin film; Pulsed laser deposition  

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