Schiff base modified Pt electrode as sensor for detecting Al(III) and Pb(II)

832-837A platinum electrode with its surface modified with the condensation product of p-phenylenediamine and acetylferrocene (PPDA-AcFc) has been fabricated by cyclic voltammetry. The square wave voltammogram of the modified electrode, PPDA-AcFc/Pt, in aqueous medium gradually shifts by 0.440 V and 0.090 V in the positive direction on interaction with Al3+ and Pb2+ respectively. Electrochemical impedance spectroscopy shows the charge transfer resistance value of PPDA-AcFc/Pt electrode increases in the case of Al3+ while it decreases in the case of Pb2+. The linear range of detection is 0-12 µM and 0-6 µM for Al3+ and Pb2+ respectively

Voltammetric distinction between dopamine and ascorbic acid using bare platinum disc electrode catalysed by bisethylenediaminecopper(II)

Bare platinum disc electrode in presence of bisethylenediaminecopper(II), [Cu(en)2]2+ where en = H2NCH2CH2NH2, in the electrolytic medium excellently distinguishes between dopamine (DA) and ascorbic acid (AA) in their aqueous mixture by cyclic voltammetry and square wave voltammetry. Both DA and AA independently changes the irreversible cyclic voltammogram of [Cu(en)2]2+ into a quasi reversible ones with redox potential value +0.045 V and +0.150 V respectively. The redox currents are linear function of DA and AA concentration. Interaction of [Cu(en)2]2+ with DA and AA mixture resulted quasi reversible cyclic voltammogram with a pair of redox couples with potential +0.220 V and +0.530 V due to DA and AA respectively

Voltammetric distinction between dopamine and ascorbic acid using bare platinum disc electrode catalysed by bisethylenediaminecopper(II)

102-106Bare platinum disc electrode in presence of bisethylenediaminecopper(II), [Cu(en)2]2+ where en = H2NCH2CH2NH2, in the electrolytic medium excellently distinguishes between dopamine (DA) and ascorbic acid (AA) in their aqueous mixture by cyclic voltammetry and square wave voltammetry. Both DA and AA independently changes the irreversible cyclic voltammogram of [Cu(en)2]2+ into a quasi reversible ones with redox potential value +0.045 V and +0.150 V respectively. The redox currents are linear function of DA and AA concentration. Interaction of [Cu(en)2]2+ with DA and AA mixture resulted quasi reversible cyclic voltammogram with a pair of redox couples with potential +0.220 V and +0.530 V due to DA and AA respectively

Schiff base modified Pt electrode as sensor for detecting Al(III) and Pb(II)

A platinum electrode with its surface modified with the condensation product of p-phenylenediamine and acetylferrocene (PPDA-AcFc) has been fabricated by cyclic voltammetry. The square wave voltammogram of the modified electrode, PPDA-AcFc/Pt, in aqueous medium gradually shifts by 0.440 V and 0.090 V in the positive direction on interaction with Al3+ and Pb2+ respectively. Electrochemical impedance spectroscopy shows the charge transfer resistance value of PPDA-AcFc/Pt electrode increases in the case of Al3+ while it decreases in the case of Pb2+. The linear range of detection is 0-12 mM and 0-6 mM for Al3+ and Pb2+ respectively

Silver nanoparticle modified Pt electrode as voltammetric and electrochemical impedance sensor for hydrogen peroxide in live biological cells

485-489A non-enzymatic electrochemical sensor for hydrogen peroxide based on silver nanoparticle (AgNP) modified platinum electrode has been fabricated by multiple cyclic voltammetric scan of platinum electrode in AgNP solution in aqueous medium. The modified electrode (Pt/AgNP) can detect hydrogen peroxide in aqueous medium, bovine serum albumin  and live L6 rat myoblast cells with high sensitivity and selectivity by cyclic voltammetry and electrochemical impedance spectroscopy. The limit of detection of Pt/AgNP towards H2O2 is 5.4×10-7 M. The detection of H2O2 by Pt/AgNP is free of interference from Na+, K+, Ca2+, Mg2+, dopamine and ascorbic acid