Prussian blue based impedimetric urea biosensor

Application of Prussian Blue in Electrochemical and Optical Sensing of Free Chlorine

“…Considering that voltammetric data ( Figure 2 and Figure 3 ) indicated a redox reaction between PW and FCL, further investigation of the glass|FTO|PB sensor in FCL-containing PBS was performed by the means of chronoamperometry at a constant potential of 0 V vs. Ag|AgCl, KCl sat . because at this potential, PB exists in its reduced form, PW [ 29 , 39 , 54 , 55 ]. As it was expected, the reduction current of the glass|FTO|PB sensor increased after the addition of each amount of FCL into PBS ( Figure 4 , inset) and was linearly proportionate to the amount of FCL added into the buffer solution ( Figure 4 ).…”

“…(scan rate 40.0 mV s −1 ) [ 30 , 37 ] in the solution of 1 mmol L −1 , 1 mmol L −1 and 0.1 mol L −1 . Finally, the layer of PB was electrochemically stabilized [ 30 , 39 , 53 , 54 ] by applying 20 voltammetric cycles to the glass|FTO|PB electrode in 0.1 mol L −1 and 0.1 mol L −1 -containing solution in the potential interval from +0.45 to 0 V (vs. Ag|AgCl, KCl sat. ) at a scan rate of 40.0 mV s −1 .…”

Prussian Blue Modified Amperometric Hg2+ Ion Biosensor Based on Glucose Oxidase Inhibition

“…The glass j FTO j PB electrode was prepared by electrochemical deposition of PB layer on the surface of glass j FTO electrode. Before the deposition of PB layer, the glass j FTO electrode was cleaned by adjusted treatment [27][28][29][30]32] with ultrasound (i) in a 2 % laboratory dish cleaning solution of MICRO ® À 90, (ii) in acetone, (iii) in deionized water for 16 min during each step of treatment (i, ii and iii). After these procedures, a layer of PB was deposited on the glass j FTO electrode by applying 40 voltammetric cycles in the potential range from + 0.4 V to + 0.8 V vs Ag j AgCl, KCl sat (scan rate 40.0 mV s À 1 ) [30] in the solution consisted of 1 mM K 3 [Fe(CN) 6 ], 1 mM FeCl 3 and 0.1 M HCl.…”

“…Prussian blue (PB) is a well-known, inexpensive, and easily-prepared redox material often used in developing sensors and biosensors [25][26][27][28][29][30][31][32][33][34]. One of the most important features of PB, determining its wide applicability in biosensorics, is the ability of PB to catalyze electrochemical reduction of hydrogen peroxide (Eq.…”

“…When PB is used in construction of electrochemical devices, it is important to ensure that PB is presented in so-called "soluble" form, whereas it is considered [27,28,36,37] that "soluble" PB exhibits better electrochemical stability i. e., the ability to undergo reversible redox transition between neutral and reduced state multiple times. In order to ensure that PB exists in electrochemically stable "soluble" form, cyclic voltammetry-based enrichment of PB with K + or NH 4 + ions should be performed after the synthesis of PB by electrochemically reducing PB to its reduced form -Prussian white (PW) -and re-oxidising PW again into PB form multiple times in K + or NH 4…”