A Polyhedral Oligomeric Silsesquioxane (POSS) Doped with Cerium(III) / Fe(II) and its Application as an Electrochemical Sensor for L-dopamine

• Autor(a) principal: dos Santos Franco, Fernanda [UNESP]
• Data de Publicação: 2022
• Outros Autores: Peixoto, Murilo Santos [UNESP], dos Santos Felipe, Alexsandro [UNESP], do Carmo, Devaney Ribeiro [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• DOI: 10.1007/s12633-022-01659-x
• Texto Completo: http://dx.doi.org/10.1007/s12633-022-01659-x; http://hdl.handle.net/11449/230330
• topic: Electrochemical sensor; L-dopamine; Metals; Silsesquioxanes; Spectroscopy

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.