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
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F19%3A73598145" target="_blank" >RIV/61989592:15310/19:73598145 - isvavai.cz</a>
Alternative codes found
RIV/00216224:14310/19:00109284
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0013468619303986" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0013468619303986</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.electacta.2019.03.004" target="_blank" >10.1016/j.electacta.2019.03.004</a>
Alternative languages
Result language
angličtina
Original language name
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
Original language description
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 = 3 mm) 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 (E-p = 89 mV at eAu/Si-sparked SPE) with respect to both bare SPE (E-p = 503 mV) and bulk gold electrode (E-p = 358 mV). Simultaneous differential pulse voltammetric sensing of ascorbic and uric acids in human urine is also demonstrated.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10406 - Analytical chemistry
Result continuities
Project
<a href="/en/project/GA15-05198S" target="_blank" >GA15-05198S: Nanostructured metal layers on conductive and semiconductive substrates as a sensing platform for application in chemical and biomedical analysis</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
ELECTROCHIMICA ACTA
ISSN
0013-4686
e-ISSN
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Volume of the periodical
304
Issue of the periodical within the volume
MAY
Country of publishing house
GB - UNITED KINGDOM
Number of pages
9
Pages from-to
292-300
UT code for WoS article
000461909000032
EID of the result in the Scopus database
2-s2.0-85063114396