Plasmon study of the application of MnO2/Au nanoparticles as an electrochemical sensor for H2O2 by an electrostatic layer-by-layer deposition method

• Grant number: 19/15885-4
• Support Opportunities: Scholarships in Brazil - Master
• Start date: November 01, 2019
• End date: July 31, 2021
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Susana Inés Córdoba de Torresi
• Grantee: Vítor Mendes Miguel
• Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 15/26308-7 - Optimization of the physicochemical properties of nano -structured materials for applications in molecular recognition, catalysis and energy conversion/storage, AP.TEM

Abstract

The determination of the H2O2 concentration is of extreme importance in environmental, food, environmental, industrial and pharmaceutical sectors, and the construction of sensors capable of making this determination with precision and efficiency has been studied extensively over the years. Among the methods of determination, the electrochemical methods stand out for the simplicity and speed of the analyzes, being developed several sensors based on materials capable of reacting catalytically with H2O2. Nanoparticles of MnO2 have a great catalytic activity in the decomposition of H2O2 and have been used for the manufacture of several sensors using different methodologies of film formation. Its application together with other metals, in particular the Au, presents very promising results by joining catalytic properties of the two materials, thus increasing the catalytic current generated in the H2O2 decomposition, thus reducing the sensing limits of the sensors. The present project proposes the application of a sensor composed of layers of MnO2 nanowires with Au nanoparticles (AuNPs) deposited on its surface together layers of polydialyldimethylammonium (PDDA) using the layer-by-layer method to form the film through forces. The sensor will be characterized electrochemically by cyclic voltammetry and the number of deposited bilayers will be optimized in relation to the electrochemical response. The sensor will be used for the determination of hydrogen peroxide in the presence and absence of light and a calibration curve will be constructed using the amperometry technique. Its performance will be tested in media containing interferents for the simulation of a real sample and its stability will be tested through the analytical response of the same sensor as the days pass. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

MIGUEL, VITOR M.; RODRIGUES, MARIA PAULA DE S.; BRAGA, ADRIANO H.; DE TORRESI, SUSANA I. CORDOBA. MnO2 Nanowires Decorated with Au Nanoparticles for Plasmon- Enhanced Electrocatalytic Detection of H2O2. ACS APPLIED NANO MATERIALS, v. 5, n. 2, p. 10-pg., 2022-01-28. (19/15885-4, 15/26308-7, 18/16846-0)

DE LIMA, SCARLLETT L. S.; MIGUEL, VITOR M.; ROSADO, TAISSA F.; V. PETRI, MARCOS V.; GARDENER, JULES; AVILLEZ, ROBERTO; RODRIGUES, THENNER S.; DE TORRESI, SUSANA I. CORDOBA; SOLORZANO, GUILLERMO; DA SILVA, ANDERSON G. M.. Sized-controlled Pd nanoflowers by a non-classical growth mechanism combining the LaMer and DLVO theories and their catalytic activities. MATERIALS TODAY COMMUNICATIONS, v. 33, p. 8-pg., 2022-09-09. (15/26308-7, 19/15885-4, 21/00675-4)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

MIGUEL, Vítor Mendes. Plasmon enhanced H2O2 electrooxidation by MnO2 nanowires decorated with Au nanoparticles. 2021. Master's Dissertation - Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ) São Paulo.