Banca de QUALIFICAÇÃO: RAFAEL SILVEIRA MOURÃO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : RAFAEL SILVEIRA MOURÃO
DATE: 29/08/2023
TIME: 14:00
LOCAL: On-line
TITLE:

SYNTHESIS AND CHARACTERIZATION OF QUANTUM POINTS OF Cu-In-S-Zn/ZnS AND INCORPORATION INTO POLYDIMETHYLSILOXANE FILM (PDMS) FOR APPLICATION IN PLANT GROWTH BY CONTROLLED LIGHT INDUCTION

KEY WORDS:

Quantum dot; CZIS/ZnS; PDMS; polymeric film; Degradation of nanomaterials.

PAGES: 30
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Inorgânica
SPECIALTY: Foto-Química Inorgânica
SUMMARY:

This work consisted in the preparation of copper, indium and zinc sulfide quantum dots (QDs) with the addition of zinc sulfide shell (CZIS/ZnS) and its subsequent insertion in a polydimethylsiloxane (PDMS) polymeric matrix, deposited on a glass matrix for application in plant growth by controlled light induction.  The QD colloidal solution and the prepared films were characterized by UVVIS absorption/diffuse reflectance and photoluminescence spectroscopic techniques. The results were divided into three parts: Preparation of QDs and polymeric films; stability and degradation and application of the films in plant growth. There were no problems in the insertion of the QDs into the polymeric matrix, resulting in emission and absorption spectra comparable to those of a colloidal solution of the same QD. The films deposited on the glass proved to be efficient for use in the application studied by having good transmittance in the emission region of the QDs, but the stability of the nanomaterials proved to be a problem, with a degradation of photoluminescence over the course of a few days of the material being exposed to light. The films were promising for plant growth, with an increase in chlorophyll in the leaves compared to plants that were not exposed under the polymeric film containing QDs.

BANKING MEMBERS:
Interno - 1527524 - WAGNER SOUZA MACHADO
Externa à Instituição - CALINK INDIARA DO LIVRAMENTO DOS SANTOS - UFSJ