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Micro Solid‐Contact Ion‐Selective Electrode Using a Carbon Nanotube Tower as Ion‐to‐Electron Transducer and Conductive Substrate
Author(s) -
Guo Xuefei,
Meyung Timothy,
Yun Yeoheung,
Shanov Vesselin N.,
Halsall H. Brian,
Heineman William R.
Publication year - 2012
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201200348
Subject(s) - materials science , carbon nanotube , electrode , transducer , ion , fabrication , optoelectronics , substrate (aquarium) , electrical conductor , nanotechnology , composite material , electrical engineering , chemistry , alternative medicine , oceanography , engineering , organic chemistry , pathology , geology , medicine
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 a Ca2+ , 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.