Abstract
A Polyhedral oligomeric silsesquioxane (POSS) doped with cerium (III) was synthesized and reacted with potassium hexacyanoferrate (SCeH). The vibrational, structural, morphological and electrochemical properties of this compound were studied by Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopic, X-ray diffraction, Scanning electron microscopy, Energy dispersive X-ray and voltammetry using a modified graphite paste electrode. The modified paste electrode containing SCeH (SCeGPE) verified one redox pair with formal potential Eθ’ = 0.33 V ± 0.01 (vs Ag/AgCl, KCl, 1.0 mol L−1; v = 100 mV s−1), attributed to the Fe2+/Fe3+ process in the presence of Cerium (III) cyanoferrate. The redox couple presents a high sensitivity and wide response range in the detection of L-dopamine. The limit of detection and amperometric sensibility were established at 4.08 × 10–4 mol L−1 and 8.27 × 10−6 mol L−1 employing the voltammetric and chronoamperometric methods respectively.
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The student Fernanda S. Franco would like to express her gratitude to the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the granted scholarship.
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This work was supported by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP – Process 2018/24576–2).
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Fernanda dos Santos Franco: designed and performed the electrochemical experiments and verified the analytical methods; Murilo Santos Peixoto and Alexsandro dos Santos Felipe: performed some experiments. Devaney Ribeiro do Carmo: conceived the presented idea, performed some spectroscopic experiments and wrote the manuscript in consultation with the other authors. All authors participated in the discussion of the study results, contributing to the final manuscript.
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dos Santos Franco, F., Peixoto, M.S., dos Santos Felipe, A. et al. A Polyhedral Oligomeric Silsesquioxane (POSS) Doped with Cerium(III) / Fe(II) and its Application as an Electrochemical Sensor for L-dopamine. Silicon 14, 9543–9554 (2022). https://doi.org/10.1007/s12633-022-01659-x
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DOI: https://doi.org/10.1007/s12633-022-01659-x