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Article

Electrochemical Properties of Screen-Printed Carbon Nano-Onion Electrodes

1
School of Chemical Sciences, National Centre for Sensor Research, Dublin City University, Dublin 9, Ireland
2
FutureNeuro SFI Research Centre, Dublin, Ireland
*
Authors to whom correspondence should be addressed.
Academic Editor: Ashok Kakkar
Molecules 2020, 25(17), 3884; https://doi.org/10.3390/molecules25173884
Received: 19 June 2020 / Revised: 21 August 2020 / Accepted: 24 August 2020 / Published: 26 August 2020
(This article belongs to the Special Issue Nanochemistry: Good Beginnings for a Cross-Disciplinary Platform)
The properties of carbon nano-onions (CNOs) make them attractive electrode materials/additives for the development of low-cost, simple to use and highly sensitive Screen Printed Electrodes (SPEs). Here, we report the development of the first CNO-based ink for the fabrication of low-cost and disposable electrodes, leading to high-performance sensors. Achieving a true dispersion of CNOs is intrinsically challenging and a key aspect of the ink formulation. The screen-printing ink formulation is achieved by carefully selecting and optimising the conductive materials (graphite (GRT) and CNOs), the polymer binder, the organic solvent and the plasticiser. Our CNO/GRT-based screen-printed electrodes consist of an interconnected network of conducting carbon particles with a uniform distribution. Electrochemical studies show a heterogeneous electron transfer rate constant of 1.3 ± 0.7 × 10−3 cm·s−1 and a higher current density than the ferrocene/ferrocenium coupled to a commercial graphite SPEs. In addition, the CNO/GRT SPE can detect dopamine in the concentration range of 10.0–99.9 µM with a limit of detection of 0.92 µM (N = 3). They exhibit a higher analytical sensitivity than the commercial graphite-based SPE, with a 4-fold improvement observed. These results open up the possibility of using high-performing CNO-based SPEs for electrochemical applications including sensors, battery electrodes and electrocatalysis. View Full-Text
Keywords: carbon nano-onion; ink formulation; screen-printed electrode; carbon nanomaterial; dopamine carbon nano-onion; ink formulation; screen-printed electrode; carbon nanomaterial; dopamine
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MDPI and ACS Style

Cumba, L.R.; Camisasca, A.; Giordani, S.; Forster, R.J. Electrochemical Properties of Screen-Printed Carbon Nano-Onion Electrodes. Molecules 2020, 25, 3884. https://doi.org/10.3390/molecules25173884

AMA Style

Cumba LR, Camisasca A, Giordani S, Forster RJ. Electrochemical Properties of Screen-Printed Carbon Nano-Onion Electrodes. Molecules. 2020; 25(17):3884. https://doi.org/10.3390/molecules25173884

Chicago/Turabian Style

Cumba, Loanda R., Adalberto Camisasca, Silvia Giordani, and Robert J. Forster. 2020. "Electrochemical Properties of Screen-Printed Carbon Nano-Onion Electrodes" Molecules 25, no. 17: 3884. https://doi.org/10.3390/molecules25173884

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