期刊
MOLECULES
卷 25, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/molecules25173884
关键词
carbon nano-onion; ink formulation; screen-printed electrode; carbon nanomaterial; dopamine
资金
- Science Foundation Ireland (SFI) [16/RC/3948]
- European Regional Development Fund
- FutureNeuro industry partners
- Enterprise Ireland [CF-2019-1075-P]
- Irish Research Council [GOIPD/2019/525]
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 x 10(-3)cm center dot 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 mu M with a limit of detection of 0.92 mu M (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.
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