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

Author(s)

Aruã C. da Silva ^[1] ; Marco A. O. S. Minadeo ^[2] ; Susana I. C. de Torresi ^[3]

Affiliation

^[1] Universidade de São Paulo. Instituto de Química - Brasil

^[2] Universidade de São Paulo. Instituto de Química - Brasil

^[3] Universidade de São Paulo. Instituto de Química - Brasil

• Document type: Journal article
• Source: Journal of the Brazilian Chemical Society; v. 30, n. 10, p. 2066-2075, 2019-10-21.

Abstract

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)

• FAPESP's process: 15/26308-7 - Optimization of the physicochemical properties of nano -structured materials for applications in molecular recognition, catalysis and energy conversion/storage
• Grantee: Roberto Manuel Torresi
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 14/09353-6 - Biomaterials based on conducting biodegradable and biocompatible polymers
• Grantee: Aruã Clayton da Silva
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 13/00322-8 - Synthesis and characterization of hybrid nanoparticles for electrochemical devices
• Grantee: Marco Antonio de Oliveira Santos Minadeo
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)