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A solid-state pH sensor for nonaqueous media including ionic liquids

Journal Article


Abstract


  • We describe a solid state electrode structure based on a biologically derived proton-active redox center, riboflavin (RFN). The redox reaction of RFN is a pH-dependent process that requires no water. The electrode was fabricated using our previously described 'stuffing' method to entrap RFN into vapor phase polymerized poly(3,4-ethylenedioxythiophene). The electrode is shown to be capable of measuring the proton activity in the form of an effective pH over a range of different water contents including nonaqueous systems and ionic liquids (ILs). This demonstrates that the entrapment of the redox center facilitates direct electron communication with the polymer. This work provides a miniaturizable system to determine pH (effective) in nonaqueous systems as well as in ionic liquids. The ability to measure pH (effective) is an important step toward the ability to customize ILs with suitable pH (effective) for catalytic reactions and biotechnology applications such as protein preservation. © 2013 American Chemical Society.

UOW Authors


  •   Winther-Jensen, Orawan (external author)
  •   MacFarlane, Douglas R. (external author)
  •   Winther-Jensen, Bjorn (external author)
  •   Thompson, Brianna C.

Publication Date


  • 2013

Citation


  • Thompson, B. C., Winther-Jensen, O., Winther-Jensen, B. & MacFarlane, D. (2013). A solid-state pH sensor for nonaqueous media including ionic liquids. Analytical Chemistry, 85 (7), 3521-3525.

Scopus Eid


  • 2-s2.0-84875792708

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/619/

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 3521

End Page


  • 3525

Volume


  • 85

Issue


  • 7

Abstract


  • We describe a solid state electrode structure based on a biologically derived proton-active redox center, riboflavin (RFN). The redox reaction of RFN is a pH-dependent process that requires no water. The electrode was fabricated using our previously described 'stuffing' method to entrap RFN into vapor phase polymerized poly(3,4-ethylenedioxythiophene). The electrode is shown to be capable of measuring the proton activity in the form of an effective pH over a range of different water contents including nonaqueous systems and ionic liquids (ILs). This demonstrates that the entrapment of the redox center facilitates direct electron communication with the polymer. This work provides a miniaturizable system to determine pH (effective) in nonaqueous systems as well as in ionic liquids. The ability to measure pH (effective) is an important step toward the ability to customize ILs with suitable pH (effective) for catalytic reactions and biotechnology applications such as protein preservation. © 2013 American Chemical Society.

UOW Authors


  •   Winther-Jensen, Orawan (external author)
  •   MacFarlane, Douglas R. (external author)
  •   Winther-Jensen, Bjorn (external author)
  •   Thompson, Brianna C.

Publication Date


  • 2013

Citation


  • Thompson, B. C., Winther-Jensen, O., Winther-Jensen, B. & MacFarlane, D. (2013). A solid-state pH sensor for nonaqueous media including ionic liquids. Analytical Chemistry, 85 (7), 3521-3525.

Scopus Eid


  • 2-s2.0-84875792708

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/619/

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 3521

End Page


  • 3525

Volume


  • 85

Issue


  • 7