Journal
ELECTROANALYSIS
Volume 26, Issue 9, Pages 1886-1892Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201400214
Keywords
Ionic liquid; Screen-printed electrodes; Carbon nanotubes; 17 alpha-Ethynylestradiol
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Funding
- National Research Foundation
- Economic Development Board (SPORE) [COY-15-EWI-RCFSA/N197-1]
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Compared with paraffin oil, the use of ionic liquids as a binder in carbon paste type electrodes was shown to greatly enhance the accumulation of analytes, as illustrated with 17 alpha-ethynylestradiol as a model. The ionic liquid n-octyl-pyridinium hexafluorophosphate [C(8)py][PF6] was most efficient among several ionic liquids investigated. Such preconcentration allowed a [C(8)py][PF6]-multiwalled carbon nanotubes (MWCNTs) (95:5 w/w) composite electrode to be useful for adsorptive stripping voltammetry. Screen-printed electrodes modified with [C(8)py][PF6]-MWCNTs were developed and were able to achieve high sensitivity during adsorptive stripping voltammetric measurements under optimised conditions.
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