Studies of semiconductor characteristics for CdS thin films modified by cadmium telluride nanoparticles (quantum dots)

• Grant number: 11/20953-7
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: March 01, 2012
• End date: February 06, 2016
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Sergio Antonio Spinola Machado
• Grantee: Vanessa Nascimento dos Santos
• Host Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated scholarship(s): 14/08885-4 - Charge carrier dynamics in ZnO rods sensitized with CdTe quantum dots: photoelectrodes for water splitting, BE.EP.DR

Abstract

In this Project the synthesis and characterization of cadmium telluride (CdTe) quantum dots, QDs, with different diameters and caped with triocytlphosphine (TOP) and triocytlphosphine oxide (TOPO) will be investigated. The nanostructures diameters will be controlled by reaction medium temperature and evaluated by UV-vis absorption. In the sequence, ZnO nanorods vertically aligned will be deposited on stainless steel, electrochemical quartz crystal microbalance (EQCM) Pt electrodes and ITO, from a 5 mM ZnCl2 + 0,1 M KCl oxygen saturated bath and characterized by AFM and SEM-FEG microscopies and X-ray diffraction. For nanorods modification with QDs, the TOP/TOPO capping will be substituted by an alkanethiol coverage (mercaptopropionic acid - MPA) and further adsorption by immersion of the surfaces modified with nanorods, monitored by EQCM. The electrical, optical and electrochemistry characteristics of such modified electrode will be evaluated by voltammetric, electrochemical impedance and UV-vis absorption measurements.

Academic Publications

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

SANTOS, Vanessa Nascimento dos. Study of semiconductor features of zinc oxide films modified with cadmium telluride quantum dots. 2016. Doctoral Thesis - Universidade de São Paulo (USP). Instituto de Química de São Carlos (IQSC/BT) São Carlos.