TY - JOUR
T1 - Ferrocene-containing polyelectrolyte multilayer film-covered electrodes
T2 - Electrocatalytic determination of ascorbic acid and use of inner blocking layers to improve the upper detection limit of the electrodes
AU - Liu, Aihua
AU - Anzai, Jun Ichi
PY - 2004/9
Y1 - 2004/9
N2 - A multilayer film composed of ferrocene(Fc)-appended poly(allylamine hydrochloride) (Fc-PAH) and poly(potassium vinylsulfate) (PVS) has been prepared on the surface of a gold(Au) electrode by using a layer-by-layer self-assembly technique. Fc-containing polyelectrolyte multilayer (PEM) film-modified electrodes can electrochemically catalyze the oxidation of ascorbic acid successfully. For a 2 (Fc-PAH/PVS) bilayer-covered electrode the catalytic current increased linearly with increasing concentration of ascorbic acid over the concentration range 6 μmol L-1-3 mmol L -1. To extend the dynamic range for ascorbic acid, the surface of the Au electrode was first covered with a (PAH/PVS)2 film on which an additional (Fc-PAH/PVS)5 film was coated. This strategy successfully extended the dynamic range of the electrode up to 25 mmol L -1 ascorbic acid, because the (PAH/PVS)2 layer blocked access of ascorbic acid to the electrode surface. The upper detection limit of the (PAH/PVS)2 (Fc-PAH/PVS)5 film-modified electrode is much higher than those of Fc-based ascorbic acid sensors reported so far. Electron transfer is diffusion-controlled within the (PAH/PVS) 2(Fc-PAH/PVS)5 film.
AB - A multilayer film composed of ferrocene(Fc)-appended poly(allylamine hydrochloride) (Fc-PAH) and poly(potassium vinylsulfate) (PVS) has been prepared on the surface of a gold(Au) electrode by using a layer-by-layer self-assembly technique. Fc-containing polyelectrolyte multilayer (PEM) film-modified electrodes can electrochemically catalyze the oxidation of ascorbic acid successfully. For a 2 (Fc-PAH/PVS) bilayer-covered electrode the catalytic current increased linearly with increasing concentration of ascorbic acid over the concentration range 6 μmol L-1-3 mmol L -1. To extend the dynamic range for ascorbic acid, the surface of the Au electrode was first covered with a (PAH/PVS)2 film on which an additional (Fc-PAH/PVS)5 film was coated. This strategy successfully extended the dynamic range of the electrode up to 25 mmol L -1 ascorbic acid, because the (PAH/PVS)2 layer blocked access of ascorbic acid to the electrode surface. The upper detection limit of the (PAH/PVS)2 (Fc-PAH/PVS)5 film-modified electrode is much higher than those of Fc-based ascorbic acid sensors reported so far. Electron transfer is diffusion-controlled within the (PAH/PVS) 2(Fc-PAH/PVS)5 film.
KW - Ascorbic acid
KW - Dynamic detection range
KW - Ferrocene
KW - Inner blocking layer
KW - Polyelectrolyte multilayer film
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U2 - 10.1007/s00216-004-2728-5
DO - 10.1007/s00216-004-2728-5
M3 - Article
C2 - 15257429
AN - SCOPUS:21044433603
SN - 1618-2642
VL - 380
SP - 98
EP - 103
JO - Fresenius Zeitschrift fur Analytische Chemie
JF - Fresenius Zeitschrift fur Analytische Chemie
IS - 1
ER -