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Nanostructured Gold Microelectrodes for Non‐enzymatic Glucose Sensor
Author(s) -
Hovancová Jana,
Šišoláková Ivana,
Vanýsek Petr,
Oriňaková Renáta,
Shepa Ivan,
Vojtko Marek,
Oriňak Andrej
Publication year - 2019
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201900163
Subject(s) - microelectrode , nanoclusters , materials science , nanotechnology , colloidal gold , scanning electron microscope , reproducibility , biosensor , analytical chemistry (journal) , nanoparticle , chemistry , electrode , chromatography , composite material
A novel, highly stable, selective, and sensitive non‐enzymatic glucose sensor was developed by simple and effective modification procedure. The modification of gold microelectrodes by electrochemically deposited gold nanoparticles resulted in increase of surface area up to 37 %. The nanostructured surfaces of the gold microelectrodes obtained by different modifications were studied by confocal microscopy, atomic force microscopy, and scanning electron microscopy. The gold nanoclusters exhibit great electrocatalytic properties toward glucose with a wide linear range from 0.5 to 50 mM, with a limit of detection 218 μM, and sensitivity of 185.2 mA mM −1 cm −2 . Moreover, the modified microelectrodes display good reproducibility, stability, and selectivity in the presence of poisoning compounds. Due to the small dimensions of gold microelectrodes and a very small volume of the sample, the microelectrodes make a contribution to miniaturisation of the system.