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@article{1505758,
author = {Trachioti, Maria G. and Tzianni, Eleni I and Riman, Daniel and Jurmanová, Jana and Prodromidis, Mamas and Hrbáč, Jan},
article_location = {Oxford},
article_number = {1 May 2019},
doi = {http://dx.doi.org/10.1016/j.electacta.2019.03.004},
keywords = {Spark discharge; Gold nanoparticles; 3D positioning device; Screen-printed electrodes; Simultaneous determination of ascorbic acid and uric acid},
language = {eng},
issn = {0013-4686},
journal = {Electrochimica Acta},
title = {Extended coverage of screen-printed graphite electrodes by spark discharge produced gold nanoparticles with a 3D positioning device. Assessment of sparking voltage-time characteristics to develop sensors with advanced electrocatalytic properties},
url = {https://www.sciencedirect.com/science/article/pii/S0013468619303986},
volume = {304},
year = {2019}
}
TY - JOUR
ID - 1505758
AU - Trachioti, Maria G. - Tzianni, Eleni I - Riman, Daniel - Jurmanová, Jana - Prodromidis, Mamas - Hrbáč, Jan
PY - 2019
TI - Extended coverage of screen-printed graphite electrodes by spark discharge produced gold nanoparticles with a 3D positioning device. Assessment of sparking voltage-time characteristics to develop sensors with advanced electrocatalytic properties
JF - Electrochimica Acta
VL - 304
IS - 1 May 2019
SP - 292-300
EP - 292-300
PB - Pergamon-Elsevier Science Ltd.
SN - 00134686
KW - Spark discharge
KW - Gold nanoparticles
KW - 3D positioning device
KW - Screen-printed electrodes
KW - Simultaneous determination of ascorbic acid and uric acid
UR - https://www.sciencedirect.com/science/article/pii/S0013468619303986
L2 - https://www.sciencedirect.com/science/article/pii/S0013468619303986
N2 - Graphite screen-printed electrodes (SPEs) were modified with gold nanoparticles (AuNPs) produced by electric spark discharge between the SPE and a gold-silicon eutectic alloy (eAu/Si) tip electrode, under atmospheric conditions at 1.2 kV DC using a fully automated procedure. The automation was based on a 3D positioning device, which allowed to precisely adjust the sparking distance and to achieve regular spacing of a predetermined number of sparks across the surface of SPEs (d=3mm) by controlling the movement of the eAu/Si tip. Moreover, the effect of voltage-time characteristics of the produced discharges on the morphological and electroanalytical properties of the sparked-modified SPEs was investigated by setting the values of capacitors in the high voltage multiplier cascade, and at the power supply output. It is shown that under specific variables the underlying carbon layer is not appreciably damaged by the spark discharges and does not contribute to electrochemical responses of sparked SPEs, i.e., the active electrode surface has been entirely covered by AuNPs. Sparked surfaces were extensively characterized by scanning electron microscopy and various electrochemical techniques, while the electroanalytical utility of eAu/Si sparked SPE was investigated with ascorbic acid as a pilot analyte. Advanced electrocatalytic activity is documented by an extreme shift of ascorbate oxidation overpotential (Ep=89mV at eAu/Si sparked SPE) with respect to both bare SPE (Ep=503mV) and bulk gold electrode (Ep=358mV). Simultaneous differential pulse voltammetric sensing of ascorbic and uric acids in human urine is also demonstrated.
ER -
TRACHIOTI, Maria G., Eleni I TZIANNI, Daniel RIMAN, Jana JURMANOVÁ, Mamas PRODROMIDIS a Jan HRBÁČ. Extended coverage of screen-printed graphite electrodes by spark discharge produced gold nanoparticles with a 3D positioning device. Assessment of sparking voltage-time characteristics to develop sensors with advanced electrocatalytic properties. \textit{Electrochimica Acta}. Oxford: Pergamon-Elsevier Science Ltd., 2019, roč.~304, 1 May 2019, s.~292-300. ISSN~0013-4686. Dostupné z: https://dx.doi.org/10.1016/j.electacta.2019.03.004.
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