Show simple item record

dc.contributor.authorGaldino, Flávia E.*
dc.contributor.authorSmith, Jamie P.*
dc.contributor.authorKwamou, Sophie I.*
dc.contributor.authorKampouris, Dimitrios K.*
dc.contributor.authorIniesta, Jesus*
dc.contributor.authorSmith, Graham C.*
dc.contributor.authorBonacin, Juliano A.*
dc.contributor.authorBanks, Craig E.*
dc.date.accessioned2016-01-26T12:26:02Z
dc.date.available2016-01-26T12:26:02Z
dc.date.issued2015-11-12
dc.identifier.citationGaldino, F. E., Smith, J. P., Kwamou, S. I., Kampouris, D. K., Iniesta, J., Smith, G. C., . . . Banks, C. E. (2015). Graphite Screen-Printed Electrodes Applied for the Accurate and Reagentless Sensing of pH. Analytical Chemistry, 87(23), 11666-11672. doi:10.1021/acs.analchem.5b01236en
dc.identifier.issn1520-6882en
dc.identifier.doi10.1021/acs.analchem.5b01236
dc.identifier.urihttp://hdl.handle.net/10034/594865
dc.description.abstractA reagentless pH sensor based upon disposable and economical graphite screen-printed electrodes (GSPEs) is demonstrated for the first time. The voltammetric pH sensor utilises GSPEs which are chemically pre-treated to form surface immobilised oxygenated species that when their redox behaviour is monitored, give a Nernstian response over a large pH range (1-13). An excellent experimental correlation is observed between the voltammetric potential and pH over the entire pH range of 1-13, such a response is not usually expected but rather deviation from linearity is encountered at alkaline pH values; absence of this has previously been attributed to a change in pKa value of surface immobilised groups. This non-deviation, which is observed here in the case of our facile produced reagentless pH sensor and also reported in the literature for pH sensitive compounds immobilized upon carbon electrodes/surfaces,where a linear response is observed over the entire pH range, is explained alternatively for the first time. The performance of the GSPE pH sensor is directly compared with a glass pH probe and applied to the measurement of pH in real samples where an excellent correlation between the two protocols is observed validating the proposed GSPE pH sensor.
dc.language.isoenen
dc.publisherAmerican Chemical Societyen
dc.relation.urlhttp://pubs.acs.org/journal/anchamen
dc.subjectGraphite screen printed electrodesen
dc.subjectpH sensingen
dc.subjectXPSen
dc.titleGraphite Screen-Printed Electrodes Applied for the Accurate and Reagentless Sensing of pHen
dc.typeArticleen
dc.contributor.departmentUniversity of Campinas, Brazil (Galdino, Bonacin), Manchester Metropolitain University (JP Smith, Kampouris, Banks), Universite Paris Est Creteil, France (Kwamou), University of Alicante, Spain (Inestia), University of Chester (GC Smith)en
dc.identifier.journalAnalytical Chemistry
rioxxterms.versionofrecordhttps://doi.org/10.1021/acs.analchem.5b01236
refterms.dateFOA2018-08-14T00:34:14Z
html.description.abstractA reagentless pH sensor based upon disposable and economical graphite screen-printed electrodes (GSPEs) is demonstrated for the first time. The voltammetric pH sensor utilises GSPEs which are chemically pre-treated to form surface immobilised oxygenated species that when their redox behaviour is monitored, give a Nernstian response over a large pH range (1-13). An excellent experimental correlation is observed between the voltammetric potential and pH over the entire pH range of 1-13, such a response is not usually expected but rather deviation from linearity is encountered at alkaline pH values; absence of this has previously been attributed to a change in pKa value of surface immobilised groups. This non-deviation, which is observed here in the case of our facile produced reagentless pH sensor and also reported in the literature for pH sensitive compounds immobilized upon carbon electrodes/surfaces,where a linear response is observed over the entire pH range, is explained alternatively for the first time. The performance of the GSPE pH sensor is directly compared with a glass pH probe and applied to the measurement of pH in real samples where an excellent correlation between the two protocols is observed validating the proposed GSPE pH sensor.
rioxxterms.publicationdate2015-11-12
dc.dateAccepted2015-11-02
dc.date.deposited2016-01-26


Files in this item

Thumbnail
Name:
GSPE as published.pdf
Size:
1.211Mb
Format:
PDF
Request:
Article

This item appears in the following Collection(s)

Show simple item record