Perfluorosulfonate ionomer film coated electrodes as electrochemical sensors: fundamental investigations

Signal enhancement for electrochemical detection at glassy carbon electrode modified with phenyl layer

“…Because the current to be measured in the detection of analyte molecule is not only very small due to only a few number of transferable electrons per analyte molecule but also indiscernable due to the lack of selectivity of interfering species in a sample. In order to improve these signal detection limitations, several approaches have been introduced by modifying detector electrode surface via polymer coatings [2][3][4][5] and self-assembled monolayers [6][7][8][9][10][11][12]. These strategies have been mainly based on preconcentration of analyte, hydrophobicity/ hydrophilicity, and charge discrimination of an organic thin layer film to enhance the selectivity and/or sensitivity for detection.…”

Microenvironment effects on the electrochemical and photoelectrochemical properties of thionine loaded Nafion® films

“…The less electroactive species of TH in TBA-Nf film with respect to TEA-Nf film is due to the loading of a smaller amount of TH into the TBA-Nf film. Nf is an unusual ion-exchange material and prefers to incorporate large hydrophobic cations rather than small hydrophilic ions [31]. Since the ion-exchange selectivity coefficients for hydrophobic electroactive cations are large, Nf films pre-concentrate such ions even in the presence of a huge excess of inorganic cations.…”

The application of chemically modified electrodes in analytical chemistry

“…The se aration coefficient Kp for Ru(NH3);' or R~( b p y )~ reaches as high as 10-6-10-7 and the selective coefficient to sodium cation Kfa is over lo4. Whitely and Martin [30] evaluated the utility of Nafion-coated electrodes as electrochemical sensors. Wightman and coworkers [31] recently den1onstr;ited that Nation-coated ultramicroelectrodes offer improved stability for in vivo applications.…”