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Electroanalytical Applications Based on Carbon Nanotube/Prussian Blue Screen-printable Composite

  • Shim, Jun-Ho (New and Renewable Energy Research Center, Ewha Womans University) ;
  • Lee, Jae-Seon (Chemical Sensor Research Group, Department of Chemistry, Kwangwoon University) ;
  • Cha, Geun-Sig (Chemical Sensor Research Group, Department of Chemistry, Kwangwoon University) ;
  • Nam, Hak-Hyun (Chemical Sensor Research Group, Department of Chemistry, Kwangwoon University)
  • Received : 2010.02.03
  • Accepted : 2010.03.31
  • Published : 2010.06.20

Abstract

A single step fabrication process of carbon nanotube/Prussian Blue (CNT/PB) paste electrodes based on screen printing technology has been studied as an amperometric sensor for the determination of hydrogen peroxide and free chlorine. Compared to the classical carbon paste (CP) electrode, the CNT paste electrode greatly enhanced the response in the presence of hydrogen peroxide due to the electrocatalytic activity of the CNT. Based on the CNT/binder paste, PB was also incorporated into a network of CNT paste and characterized. The best electroanalytical properties of PB-mixed sensors to hydrogen peroxide were obtained with PB ratio of 10 wt % composition, which showed fast response time ($t_{90}{\leq}5$ s; 0.2 - 0.3 mM), low detection limit of 1.0 ${\mu}M$, good linear response in the range from $5.0{\times}10^{-5}$ - $1.0{\times}10^{-3}$ mol $L^{-1}$ ($r^2$ = 0.9998), and high sensitivity of -8.21 ${\mu}AmM^{-1}$. In order to confirm the enhanced electrochemical properties of CNT/PB electrode, the sensor was further applied for the determination of chlorine in water, which exhibited a linear response behavior in the range of 50 - 2000 ppb for chlorine with a slope of 1.10 ${\mu}Appm^{-1}$ ($r^2$ = 9971).

Keywords

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