Development of amperometric sensors based on mixed sol of a-NiCo(OH)2 and nickel/cobalt oxides and their association with carbon nanotubes/graphene

• Grant number: 11/21227-8
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: April 01, 2012
• End date: January 31, 2014
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Analytical Chemistry
• Principal Investigator: Lucio Angnes
• Grantee: Paulo Roberto Martins
• Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

This project aims to develop amperometric sensors based on nanostructured mixed a-NiCo(OH)2 sol, synthesized in different proportions of nickel and cobalt from the modified Tower method. The amperometric sensors should be obtained in the form of thin films, as well as in the form of carbon paste electrodes for the determination and quantification of interesting species such as carbohydrates and some drugs. Carbon Nanotubes (Single Wall Nanotubes and Multi Wall Nanotubes) and graphene will be incorporated into the material, seeking to increase performance of the sensor. The preparation of the sols directly in the presence of graphite, nanotubes or graphene can facilitate the achievement of more uniform material and this possibility should also be tested.From the thermal decomposition of ±-NiCo(OH)2, oxides of nickel/cobalt will be obtained in this way the current sensors in the form of carbon paste electrodes are also developed containing carbon nanotubes and graphene, for the determination and quantification of species of interest. The study of these new sensors should be performed by amperometric electrochemical techniques (cyclic voltammetry, impedance and techniques eletroquímca pulse).The sensors developed in this project should be used in conjunction with electroanalytical techniques such as Flow Injection Analysis (FIA) and Batch Injection Analysis (BIA). For such applications, electrochemical flow cells shall be constructed and optimized for the subsequent application of these sensors. The use of these techniques in flow will allow the development of alternative methodologies for the determination and quantification of species of interest, which can be oxidized (or reduced) by the sensors developed in this project. These materials may also be evaluated on strong magnetic electrodes, which will be prepared by sputtering of nobel metals on magnets.

Scientific publications

(4)

(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)

MARTINS, PAULO ROBERTO; NERY MOTTA, ALESSANDRA GONCALVES; NAKAMURA, MARCELO; ARAKI, KOITI; ANGNES, LUCIO. Nanostructured Alpha-Nickel Hydroxide Electrodes for High Performance Hydrogen Peroxide Sensing. Electroanalysis, v. 25, n. 9, p. 2060-2066, SEP 2013. (11/21227-8)

MARTINS, PAULO ROBERTO; TOMA, SERGIO HIROSHI; NAKAMURA, MARCELO; TOMA, HENRIQUE EISI; ARAKI, KOITI. Thermodynamic stabilization of nanostructured alpha-Ni1-xCox(OH)(2) for high efficiency batteries and devices. RSC ADVANCES, v. 3, n. 43, p. 20261-20266, 2013. (11/21227-8)

MARTINS, PAULO ROBERTO; CERDEIRA FERREIRA, LUIS MARCOS; ARAKI, KOITI; ANGNES, LUCIO. Influence of cobalt content on nanostructured alpha-phase-nickel hydroxide modified electrodes for electrocatalytic oxidation of isoniazid. SENSORS AND ACTUATORS B-CHEMICAL, v. 192, p. 601-606, MAR 2014. (11/21227-8)

FERREIRA, LUIS M. C.; MARTINS, PAULO R.; ARAKI, KOITI; TOMA, HENRIQUE H.; ANGNES, LUCIO. Amperometric Folic Acid Quantification Using a Supramolecular Tetraruthenated Nickel Porphyrin mu-Peroxo-Bridged Matrix Modified Electrode Associated to Batch Injection Analysis. Electroanalysis, v. 27, n. 10, p. 2322-2328, OCT 2015. (11/21227-8)