Screen Printed Alizarin‐Based Carbon Electrodes: Monitoring pH in Unbuffered Media | Zendy

Dai Chencheng | Zendy; Song Peng | Zendy; Wadhawan Jay D. | Zendy; Fisher Adrian C. | Zendy; Lawrence Nathan S. | Zendy

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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.

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