To our knowledge, CNT-based inks have not been used for electroanalytical work, although thick-film CNT devices have been described in connection to emission display applications. The newly developed inks thus combine the attractive advantages of CNT materials and screen-printed electrodes. By replacing the graphite with CNT we obtained thick-film sensor strips with improved electrochemical properties and analytical performance.
Such inks are composed of graphite particles, a polymeric binder and other additives. 10,11 While various conducting inks are viable for printing the working electrodes, carbon-based inks are commonly used owing to their low cost, wide potential window, and low background currents. The screen printing technology is a well established technology for the mass production of disposable electrochemical sensors. The goal of this work was to develop a production method for CNT-based screen-printed electrodes. Such sensing opportunities of CNT materials have been documented in connection to CNT-coated electrodes, 2,4,7 or using CNT/binder composite electrodes. 2–7 The attractive low potential detection of hydrogen peroxide 7 and NADH 3 at CNT-based transducers suggests great promise for dehydrogenase- and oxidase-based amperometric biosensors. 1 Recent studies demonstrated the ability of CNT to promote electron transfer reactions of important compounds and to impart higher stability onto electrochemical devices. The unique electronic, chemical, and mechanical properties of carbon nanotubes (CNT) make them extremely attractive for electrochemical sensors. Such thick-film CNT sensors have a well-defined appearance, are mechanically stable, and exhibit high electrochemical reactivity.
The fabricated CNT strips combine the attractive advantages of CNT materials and disposable screen-printed electrodes. The fabrication, and evaluation of carbon- nanotube (CNT)-derived screen-printed (SP) electrochemical sensors based on a CNT ink are reported.
0 kommentar(er)
