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Screen Printed Alizarin‐Based Carbon Electrodes: Monitoring pH in Unbuffered Media
Author(s) -
Dai Chencheng,
Song Peng,
Wadhawan Jay D.,
Fisher Adrian C.,
Lawrence Nathan S.
Publication year - 2015
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.201400704
Subject(s) - alizarin , nafion , nernst equation , carbon fibers , miniaturization , electrode , chemistry , screen printing , foil method , alizarin red , inorganic chemistry , materials science , analytical chemistry (journal) , nuclear chemistry , electrochemistry , nanotechnology , chromatography , composite material , medicine , staining , pathology , composite number
An alizarin based voltammetric pH sensor is introduced. This device is fabricated by screen printing the alizarin, which is a pH‐sensitive redox compound, mixed with carbon ink onto the carbon aluminum (aluminum foil coated with carbon paste). This electrode shows a Nernst response to both the buffered and unbuffered media, with a potential shift by 55.8 mV/pH unit and a working range up to pH 10. This approach suggests a disposable, reproducible, low‐cost method for pH sensing with the possibility of miniaturization. A further study of this type of sensor coated with nafion reveals a possible method to expand the working range and improve the stability.