A Cubic Silsesquioxane Chemically Modified with a PAMAM Dendrimer G0: an Application in Electro-Oxidation of Ascorbic Acid

Autor(es)

Do Carmo, Devaney Ribeiro ^[1] ; De Oliveira, Denys Ribeiro ^[1] ; Barbosa, Priscila Fernanda Pereira ^[1] ; Godoi, Natasha Mirella Inha ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Dept Fis & Quim, Fac Engn, Ilha Solteira UNESP, Ave Brasil Ctr 56, BR-15385000 Ilha Solteira, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SILICON; v. 11, n. 6, p. 2961-2974, DEC 2019.
• Citações Web of Science: 0

Resumo

Octa-(3-chloropropyl) octasilsesquioxane (SS) was functionalized with a PAMAM dendrimer (SP) and characterized by some spectroscopic techniques such as Fourier Transform Infrared, Nuclear Magnetic Resonance, X-ray diffraction, X-ray Dispersive Energy Spectroscopy, Scanning Electron Microscopy and cyclic voltammetry. As a fast application, after there the Ag+ was adsorbed by SP and in a second step, the resulting material was reacted with potassium hexacyanoferrate (III) (AgHSP). The cyclic voltammogram of the AgHSP showed two redox pairs with formal potentials (E-theta') of E-(I)(theta') = 0.26 V and E-(II)(theta') = 0.71 V (v = 20 mV s(-1), KNO3 1.00 mol L-1, pH 7.00) assigned to processes Ag-0 / Ag-I and Fe-II (CN)(6) / Fe-III (CN)(6), respectively. The analytical application of this new material (AgHSP) was tested in the rapid detection of acid ascorbic by strong electrocatalysis using graphite paste electrode (GPE). The limit of detection (LOD) obtained for this system was 7.034 x 10(-5) mol L-1 with an excellent amperometric sensitivity of 0.0835 A / mol L-1. (AU)

• Processo FAPESP: 14/18172-5 - Organofuncionalização de um silsesquioxano cúbico para a detecção eletroquímica de analitos de interesse ambiental e biológico
• Beneficiário: Natasha Mirella Inhã Godoi
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica