Easily Fabricated Carbon Nanotube Electrodes for Low-Ppb-Level Chromium(VI) Detection
Here we describe a facile and printable technique to fabricate the electrodes with carbon nanotubes (CNT) for the electrochemical detection of Cr(VI). The electrodes showed currents as high as 500 nA/ppb Cr(VI) for large CNT/filter paper flexible electrodes and ~5 nA/pbb Cr(VI) for CNT/printed electrodes. The limit of detection was shown as low as 5 ppb Cr(VI). The electrode could be deposited on multiple substrates, including FTO glass, flexible gold coated plastic, commercial printed electrodes. We also developed a flow detection system with CNT/printed electrodes, which could detect Cr(VI) continuously and easily similar to a microfluidic system.
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