Micro Solid‐Contact Ion‐Selective Electrode Using a Carbon Nanotube Tower as Ion‐to‐Electron Transducer and Conductive Substrate |
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| Authors: | Xuefei Guo Timothy Meyung Yeoheung Yun Vesselin N Shanov H Brian Halsall William R Heineman |
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| Institution: | 1. Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221‐0172, USA;2. Bioengineering Department, North Carolina A&T State University, Greensboro, NC 27411, USA;3. Smart Materials Nanotechnology Laboratory, Department of Mechanical, Industrial and Nuclear Engineering, University of Cincinnati, Cincinnati, OH 45221‐0072, USA |
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| Abstract: | Solid contact (SC) ion‐selective electrodes (ISEs) have been recognized as the next generation of ISEs. In this work, the electrical conductivity and mechanical strength of a carbon nanotube (CNT) tower enable it to play the dual roles of transducer and substrate for micro SC‐ISEs. The electrode had a close to Nernstian slope of 35 mV/decade aCa2+, a linear range of four orders of magnitude of calcium ion activity (10?5.6 to 10?1.8 M), and a detection limit of 1.6×10?6 M. The simplified fabrication by a one‐step drop casting makes miniaturizing SC‐ISEs and fabricating sensor arrays easier to achieve. |
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| Keywords: | Solid contact Ion‐selective electrode Carbon nanotube tower Array Microelectrode |
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