Development of an electroanalytical methodology for selective doping of electrodeposited selenium semiconducting films based in the underpotential deposition

• Grant number: 13/17053-0
• Support Opportunities: Regular Research Grants
• Start date: November 01, 2013
• End date: January 31, 2016
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Sergio Antonio Spinola Machado
• Grantee: Sergio Antonio Spinola Machado
• Host Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

In this project is proposed to synthesize and characterize quantum dots (quantum dots, QDs) of the semiconductor cadmium telluride (CdTe), with different diameters, capped with tri-n-octilfosfina (TOP) and tri-n-octilfosfina oxide (TOPO). The diameters of the nanostructures will be controlled by temperature of the reaction medium and assessed by absorption measurement in the UV-vis spectrum. Moreover, vertically aligned ZnO nanotubes will be electrodeposited on stainless steel, on a Pt electrode used in the electrochemical quartz crystal microbalance and on ITO plates from an electrolytic bath containing 5 mM ZnCl2 and 0.1 M KCl and characterized by AFM and SEM-FEG microscopy and by X-ray diffraction measurements. For the immobilization of such QDs on the ZnO nanotubes, the TOP/TOPO coatings of the former will be replaced with an alkanethiol (mercapto propionic acid - PMA) one. After that, the ZnO structures will be immersed in the QD solution and the adsorption will be monitored by the electrochemical quartz crystal microbalance. The electrical, optical and electrochemical properties of this modified electrode will be assessed through voltammetry, electrochemical impedance spectroscopy and UV-vis absorption measurements. (AU)

Scientific publications

(5)

(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)

COELHO, DYOVANI; LUIZ, GIULIANO M.; MACHADO, SERGIO A. S.. A photoelectrochemical methodology to obtain nanorods of crystalline hexagonal trigonal selenium. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, v. 820, p. 89-96, JUL 1 2018. (13/17053-0, 11/07022-4)

COELHO, DYOVANI; MACHADO, SERGIO A. S.. New contribution in the study of phase formation in mixed alkanethiol self-assembled monolayers: a powerful tool for transducers design. Electrochimica Acta, v. 142, p. 191-201, OCT 1 2014. (13/17053-0, 11/07022-4, 10/03813-4)

MORALES-NARVAEZ, EDEN; FLORIO SGOBBI, LIVIA; SPINOLA MACHADO, SERGIO ANTONIO; MERKOCI, ARBEN. Graphene-encapsulated materials: Synthesis, applications and trends. PROGRESS IN MATERIALS SCIENCE, v. 86, p. 1-24, MAY 2017. (12/08750-6, 13/17053-0, 13/20701-3)

DYOVANI COELHO; GIULIANA M. LUIZ; SERGIO A. S. MACHADO. Estimating the Electrochemically Active Area: Revisiting a Basic Concept in Electrochemistry. Journal of the Brazilian Chemical Society, v. 32, n. 10, p. 1912-1917, 2021-10-01. (13/17053-0, 11/07022-4)

DO PRADO, THIAGO M.; CINCOTTO, FERNANDO H.; MACHADO, SERGIO A. S.. Spectroelectrochemical study of acetylsalicylic acid in neutral medium and its quantification in clinical and environmental samples. Electrochimica Acta, v. 233, p. 105-112, APR 10 2017. (13/17053-0, 16/16565-5, 06/53266-4)