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CdTe QD/Er3+-doped SiO2-Nb2O5 nanocomposites: thermal, structural and photophysical properties
- Source :
- Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual), Universidade de São Paulo (USP), instacron:USP
- Publication Year :
- 2021
-
Abstract
- CdTe/Er3+-codoped SiO2–Nb2O5-based nanocomposites were prepared by a sol-gel route. The thermal, structural and photophysical properties were investigated by FTIR spectroscopy, N2 adsorption/desorption isotherms, XRD, TGA and DSC analysis, TEM images, UV–Vis spectroscopy, and photoluminescence. The influence of QDs content and niobium/erbium addition on these properties were studied. It is shown that the QDs content into the nanocomposites influences their average size and photoluminescence properties. High QDs content resulted in larger nanocomposite pore size and higher QDs average size. The average pore size created by QDs-doped samples has dimensions suitable for QD adsorption. The TEM images and photoluminescence results demonstrate the successful incorporation of CdTe QDs into the SiO2–Nb2O5 host, which results in a homogeneous nanocomposite material presenting tunable fluorescence in the range of 513–568 nm in function of QD content. Furthermore, CdTe-doped SiO2–Nb2O5-based mesoporous nanocomposite allows the QD chemical stability capped by MPA. These nanocomposites may have a potentially broad application as photonic devices, such as broadband emission devices, optical amplification and lighting.
- Subjects :
- Nanocomposite
Photoluminescence
Materials science
FOTOLUMINESCÊNCIA
Organic Chemistry
Doping
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Atomic and Molecular Physics, and Optics
0104 chemical sciences
Electronic, Optical and Magnetic Materials
Inorganic Chemistry
Adsorption
Chemical engineering
Desorption
Electrical and Electronic Engineering
Physical and Theoretical Chemistry
Fourier transform infrared spectroscopy
0210 nano-technology
Spectroscopy
Mesoporous material
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual), Universidade de São Paulo (USP), instacron:USP
- Accession number :
- edsair.doi.dedup.....ace223c46543b4b9ba216d075d443c67