Synthesis of a novel hybrid nanocomposite based on copper pentacyanonitrosylferrate and octa(aminopropyl) silsesquioxane and its behavior on L-cysteine electrooxidation

Author(s)

Magossi, Mariana de Souza ^[1] ; Fernandes, Daniela Silvestrini ^{[1, 2]} ; do Carmo, Devaney Ribeiro ^[1]

Affiliation

^[1] Univ Estadual Paulista, Ilha Solteira UNESP, Fac Engn, Ilha Solteira, SP - Brazil

^[2] Univ Sao Paulo, Ribeirao Preto USP, Fac Filosofia Ciencias & Letras, Ribeirao Preto, SP - Brazil

• Document type: Journal article
• Source: SOLID STATE SCIENCES; v. 95, SEP 2019.
• Web of Science Citations: 0

Abstract

In this study, a novel silsesquioxane and copper pentacyanonitrosylferrate compound was prepared starting from octa(aminopropyl) silsesquioxane (CA) following a new synthesis route. The prepared composite (ACCuN) was characterized by spectroscopic techniques, such infrared (FTIR), Scanning Electron Microscopy coupled with Energy X-Ray (SEM-EDS), Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD), Diffuse Reflectance UV/Vis, Electronic Paramagnetic Resonance (EPR) and cyclic voltammetry (CV). The cyclic voltammograms of the modified graphite paste electrode with ACCuN presented a redox pair with a formal potential of (E-theta')= 0.73 V (vs Ag/AgCl(sat.)) assigned to the redox couple Fe-(II)(CN)(5)NO/Fe-(III)(CN)(5)NO, respectively (vs Ag/AgCl(sat.); KCl 1.0 mol L-1; pH = 7.0; v=20 mV s(-1)). The nanocomposite ACCuN was sensitive to L-cysteine concentrations, with a linear response from 2.0x10(-4) to 2.0x10(-3) mol L-1, relative standard deviation of +/- 2% (n=3), and limit of detection and amperometric sensitivity of 1.25x10(-4) mol L-1 and 10.66 mA/mol L-1, respectively. (AU)

• FAPESP's process: 12/05438-1 - Development of novel nanostructured organically functionalized hybrid silsesquioxanes: preparation, characterization and its application as a sensor of compounds and ions of environmental and biological interest
• Grantee: Devaney Ribeiro Do Carmo
• Support Opportunities: Regular Research Grants