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MeasureNet Used in Research to Develop Micro Solid-Contact Carbon Nanotube Ion-Selective Electrode



Micro Solid-Contact Ion-Selective Electrode Using a Carbon
Nanotube Tower as Ion-to-Electron Transducer and Conductive

 Xuefei Guo, Timothy Meyung, Yeoheung Yun, Vesselin N. Shanov, H. Brian Halsall, William
R. Heineman

Electroanalysis Volume 24, Issue 11 DOI: 10.1002/elan.201200348

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 10-1.8M), and a detection limit of 1.6 x 10-6M. The simplified fabrication by a one-step drop casting makes miniaturizing SC-ISEs and fabricating sensor arrays easier to achieve.



The MeasureNet MCAN® (Multi-functional Chemical Analysis Network) system consists of up to fifteen measurement workstations networked together and managed by a single MCAN® Controller and PC. Each Workstation has two +/- 2.5v analog input channels and one high-speed serial communication channel. The analog inputs are sampled by a two channel high-resolution 24-bit Sigma-Delta A/D. Sigma-Delta converters are designed for direct connection to sensors with low signal levels. The built-in signal conditioning and noise reduction of Sigma-Delta data converters makes them ideal for the low level noisy signals often found in potentiometric measurements of high impedance sensors like pH, ISE and other electrochemical sensors. The high-speed serial channel is for sensors with digital outputs. 

The MCAN® workstation measurements are displayed in real-time on the workstation LCD and/or streamed in real-time to MeasureNet's LabKonnect cloud server for storage. Data collected at the workstations can be stored locally  on the system PC and/or in cloud data storage accounts. Cloud data can also be monitored in real-time from any internet connected device - computer, tablet or smart phone, allowing the researcher to follow the progress from virtually anywhere while running experiments for extended time periods. LabKonnect will also alert the researcher via text message if something has gone wrong. The researcher specifies a range; the system notifies team members if measurements go beyond that range. Researchers no longer need to spend valuable time and resources babysitting experiments.

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