Selective sodium sensing with gold-coated silicon nanowire field-effect transistors in a differential setup.

@article{Wipf2013SelectiveSS,
  title={Selective sodium sensing with gold-coated silicon nanowire field-effect transistors in a differential setup.},
  author={Mathias Wipf and Ralph Lukas Stoop and Alexey Tarasov and K. Bedner and Wangyang Fu and Iain A. Wright and Colin J. Martin and Edwin C Constable and Michel Calame and Christian Schoenenberger},
  journal={ACS nano},
  year={2013},
  volume={7 7},
  pages={5978-83}
}
Ion-sensitive field-effect transistors based on silicon nanowires with high dielectric constant gate oxide layers (e.g., Al2O3 or HfO2) display hydroxyl groups which are known to be sensitive to pH variations but also to other ions present in the electrolyte at high concentration. This intrinsically nonselective sensitivity of the oxide surface greatly complicates the selective sensing of ionic species other than protons. Here, we modify individual nanowires with thin gold films as a novel… CONTINUE READING
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