Gold Nanoparticles and [PEDOT-Poly(D,L-Lactic Acid)] Composite: Synthesis, Characterization and Application to H2O2 Sensing

Autor(es)

Aruã C. da Silva ; Marco A. O. S. Minadeo ; Susana I. C. de Torresi

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 30, n. 10, p. 2066-2075, Out. 2019.

Resumo

Biocompatible electrochemical devices are challenging to develop due to the toxicity of many advanced electrode materials and the difficulty to degrade the discarded material. Few recent advances were made in the synthesis of conducting biodegradable composites of polymers for electrode materials. In this article we describe the synthesis of two new inorganic/organic nanocomposites of Au nanoparticles and conducting polymers based on the biodegradable polymer poly(D,L-lactic acid) (PDLLA): Au nanoparticles/oligomers of 3,4-ethylenedioxythiophene (EDOT)-PDLLA and Au nanoparticles with poly(3,4-ethylenedioxythiophene) (PEDOT)-PDLLA. The nanocomposites were carefully analyzed; the gold nanoparticles mean sizes were 8 ± 3 and 7 ± 2 nm, respectively. 1H and 13C nuclear magnetic resonance (NMR) demonstrated the polymerization of EDOT-PDLLA made through one-pot reaction with AuIII precursor. Raman spectra show that PEDOT-PDLLA is formed in the synthesis of Au/PEDOT-PDLLA. The immobilization of Au/PEDOT-PDLLA on glassy carbon electrodes is easy and more stable than the immobilization of simple PEDOT. Au/PEDOT-PDLLA catalyzes the reduction of H2O2(aq), which was detected by chronoamperometry. The sensor is stable and presents sensitivity of 8.36 × 10-3 A mol-1 L cm-2, linear range of 1-45 mmol L-1 and limit of detection of 0.17 mmol L-1. (AU)

• Processo FAPESP: 13/00322-8 - Síntese e caracterização de nanopartículas híbridas para dispositivos eletroquímicos
• Beneficiário: Marco Antonio de Oliveira Santos Minadeo
• Linha de fomento: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 14/09353-6 - Biomateriais baseados em polímeros condutores biodegradáveis e biocompatíveis
• Beneficiário: Aruã Clayton da Silva
• Linha de fomento: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 15/26308-7 - Otimização das propriedades físico-químicas de materiais nano-estruturados e suas aplicações em reconhecimento molecular, catálise e conversão/armazenamento de energia
• Beneficiário: Roberto Manuel Torresi
• Linha de fomento: Auxílio à Pesquisa - Temático