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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
Duration: November 01, 2013 - 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


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)

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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)
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, . (13/17053-0, 11/07022-4)
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, . (12/08750-6, 13/17053-0, 13/20701-3)
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, . (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, . (13/17053-0, 16/16565-5, 06/53266-4)

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