Rezultate
Results 2024
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PECVD growth of GNW films was realized on silicon and copper substrates at different periods (15, 30 and 45 min), evidencing an increase in carbon layer thickness with the increase in deposition time.
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Cross-section SEM images of the GNW films on silicon obtained at different periods during PECVD growth
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Among the tested GNW films in the series, the flexible disposable electrode GNW 45 min/PE showed the best electrochemical sensing performance for anthracene detection, with the sensitivity of 0.3567 A/M, compared to the other GNW films with sensitivity between 0.2–0.3 A/M.
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Calibration curve for the anthracene detection for the flexible disposable GNW 45 min/PE electrode
Rezultate 2023
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PECVD growth of N-doped NCG and GNW films was realized on silicon and copper substrates. For the growth of the N-doped NCG material, a dilution of ammonia gas flow (2.15 sccm) was obtained in the reaction chamber by increasing the gas flow of the precursors at 100 sccm methane and 125 sccm hydrogen.
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GNW film showed better crystallinity and more sp2 C content than the N-NCG film, which exhibited more sp3 C content associated with amorphous regions, as inferred by XRD and XPS analysis.
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evaluation of the NCG-based transducers has been performed by cyclic voltammetry measurements in presence of 2 mM potassium ferricyanide to reveal the electrochemical properties regarding the charge transfer of the electrodes: the lowest peak separation between the redox peaks of ferricyanide ions was observed for GNW/Si sample at 2 mV/s (DE = 61 mV), which was considerably close to the Nernstian constant (59 mV).
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Cyclic voltammetry measurements for the GNW/Si sample in presence of 2 mM K3[Fe(CN)6] at 2 mV/s
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The PECVD carbonic materials grown on copper substrate were transferred on flexible polyethylene (PE) substrate to develop disposable electrode based on NCG-type materials.
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The steps include binding of PE foils on the carbonic film and Cu foil at thermal treatment (a), followed by a chemical etching process of the Cu foil with a 1 M ferric chloride solution in a patterned PE sheet which protects a Cu square template (b), then applying resin-based layer to ensure good contact insulation from the tested solutions (c).
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Scheme of the development of flexible disposable electrodes based on NCG type material.
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The flexible disposable electrode GNW/PE displayed the best electrochemical sensing performance for anthracene detection among the NCG-type material-based electrodes, with the sensitivity of 0.219 A/M and the lowest detection limit of 4.1 mM.
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Calibration curve for the anthracene detection for the flexible disposable GNW/PE electrode.
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Rezultate estimate
Realizarea procesului de dopare cu azot al filmelor de carbon crescute pentru a atinge concentrația dorită de heteroatom din rețea;
Creșterea filmelor NCG dopate cu azot pe diferite substraturi în nanoarhitectură 3D;
Dispozitive electrochimice bazate pe filme NCG dezvoltate pentru detectarea antracenului și alte HAP electroactive;
Sprijinirea colaborării dintre mediul academic și institutele naționale de cercetare, pentru a promova inovarea și transfer de tehnologie către potențiali parteneri industriali.