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

Autor(es)

Franco, Fernanda dos Santos ; Peixoto, Murilo Santos ; Felipe, Alexsandro dos Santos ; do Carmo, Devaney Ribeiro

• Tipo de documento: Artigo Científico
• Fonte: SILICON; v. N/A, p. 12-pg., 2022-01-31.

Resumo

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 E-theta' = 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 x 10(-4) mol L-1 and 8.27 x 10(-6) mol L-1 employing the voltammetric and chronoamperometric methods respectively. (AU)

• Processo FAPESP: 18/24576-2 - Oligômeros poliédricos de silsesquioxanos (POSS) híbridos e sua potencialidade analítica como sensor para compostos orgânicos e inorgânicos.
• Beneficiário: Devaney Ribeiro Do Carmo
• Modalidade de apoio: Auxílio à Pesquisa - Regular