Journal
ELECTROANALYSIS
Volume 27, Issue 4, Pages 917-923Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201400704
Keywords
pH sensor; Alizarin; Screen print; Carbon; Nafion
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Funding
- Campus for Research Excellence and Technological Enterprise (CREATE) in Singapore
- EPSRC [EP/F006586/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F006586/1] Funding Source: researchfish
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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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