Cdte
Mostrando 1-12 de 65 artigos, teses e dissertações.
-
1. Bioconjugation Between CdTe Quantum Dots and a Cationic Protein: An Analytical Method to Determine Protamine in Drug and Urine Samples
CdTe quantum dots (QD-CdTe) functionalized with mercaptosuccinic acid (MSA) were synthesized in an aqueous medium, varying synthesis time from 0.5 to 4 h. The nanoprobe were characterized by a direct relationship between synthesis time and QD size (2.61-3.04 nm). The QD-CdTe-MSA interacted with protamine (PT), a cationic protein, forming a bioconjugate, thus
J. Braz. Chem. Soc.. Publicado em: 2021-06
-
2. Improving Photoluminescence Quantum Yield of CdTe Quantum Dots Using a Binary Solvent (Water + Glycerin) in the One-Pot Approach Synthesis
The present work describes the comparison of the optical and structural properties between CdTe quantum dots (QD) synthesized in water and in the binary solvent (water + glycerin) via one-pot approach synthesis. The optical properties of the nanocrystals obtained with different synthesis parameters were characterized by UV-visible and photoluminescence spect
J. Braz. Chem. Soc.. Publicado em: 2021-04
-
3. Evaluation of the Direct Interaction between Amino Acids and Glutathione-Coated CdTe Quantum Dots and Application in Urinalysis for Histidine Determination
The present work aimed to direct amino acid (AA) sensing by quantum dots (QD) and development of an analytical method for potential fast clinical tests. Notably, AA with a positive charge or neutral polar chains, namely L-histidine (His) and L-threonine (Thr), responded to glutathione-coated CdTe (GSH-CdTe) (ΔF ≤ 90%, variation of fluorescence intensity).
J. Braz. Chem. Soc.. Publicado em: 2021-03
-
4. Pseudopotential Study of CdTe Quantum Dots: Electronic and Optical Properties
The present contribution reports on the electronic and optical properties of zinc-blende CdTe quantum dots using a pseudopotential approach. Our findings showed that the predicted nano-structured direct band gap is significantly increased relative to the bulk one. For a nanocrystal diameter in the range 1.2-5 nm, the refractive index and dielectric constant
Mat. Res.. Publicado em: 30/05/2019
-
5. Synthesis of Hydrotalcite-Supported CdTe Semiconductor Nanocrystals for Electrochemical Detection of Ciprofloxacin
In this work, CdTe quantum dots (QDs) were controllably grown onto the surface of layered double hydroxide (LDH) aiming to develop a sensitive and selective method for the electrochemical detection of ciprofloxacin (CPX). Emission and absorption spectroscopy results as well as high-resolution transmission electron microscopy (HRTEM) images evidenced the form
J. Braz. Chem. Soc.. Publicado em: 23/05/2019
-
6. The Role that Electrolytes Play in the Synthesis of Water-Soluble CdTe Quantum Dots Prepared at Ambient Temperature
In this work, we have synthesized CdTe quantum dots (QDs) dispersed in an aqueous medium at ambient temperature, and investigated their optical properties. Synthesis of CdTe QDs in the presence of simple amines removed the need for an additional energy source and inert atmosphere, in a simple and inexpensive experimental setup. The use of ammonia or hydrazin
J. Braz. Chem. Soc.. Publicado em: 2017-07
-
7. Análise comparativa das propriedades de óxidos transparentes condutores para aplicação em células solares de filmes finos de CdTe
RESUMO Este trabalho compara as propriedades de diversos óxidos transparentes condutores para serem utilizados como contatos frontais de células solares de filmes finos de CdTe. Os filmes foram depositados à temperatura ambiente, por pulverização catódica com rádio frequência, sem tratamento térmico posterior, com o objetivo de reduzir o número de
Matéria (Rio J.). Publicado em: 11/05/2017
-
8. Caracterização da eletrodeposição de filmes finos de CdTe sobre Pt em meio ácido
RESUMO A eletrodeposição tem sido empregada para a obtenção de materiais semicondutores; todavia, ainda não estão bem esclarecidos os mecanismos envolvidos neste processo. Neste sentido, este trabalho apresenta a investigação deste processo, evidenciando a caracterização do CdTe eletrodepositado sobre substrato platina em solução ácida. A deposi
Matéria (Rio J.). Publicado em: 2015-12
-
9. Optical absorption enhancement in sensitized ZnO nanorods for solar cells
ABSTRACTThe Optical Properties of ZnO Nanorods (NR) sensitized with different semiconductors in Core-Shell nanostructures were studied, comparing them with those of bare ZnO NR. Experimental measurements of Transmittance and Diffuse Reflectance show an increased light absorption at the solar spectrum and the appearances of new absorption edges (AE). The meas
Matéria (Rio J.). Publicado em: 2015-09
-
10. EFEITO DA ESTRUTURA MOLECULAR DE LIGANTES DE SUPERFÍCIE EM PONTOS QUÂNTICOS DE CdTe DISPERSOS EM ÁGUA
Water-soluble CdTe quantum dots are synthesized to investigate how short-chain surface ligands bearing -SH, -COOH, and -NH2 groups interact with CdTe during nucleation/growth processes. Their optical properties and colloidal stability after the ligand exchange are also investigated. We then characterize the resulting CdTe by fluorescence, UV–Vis absorption
Quím. Nova. Publicado em: 2015-01
-
11. Using webcam, CdTe quantum dots and flow-batch system for automatic spectrofluorimetric determination of N-Acetyl-L-cysteine in pharmaceutical formulations
Neste trabalho é proposta a combinação de um sistema flow-batch, pontos quânticos (QDs) e de uma webcam como detector para determinação espectrofluorimétrica automática de N-acetil-L-cisteina (NAC) em formulações farmacêuticas. O NAC gera interações superficiais com os QDs, que resultam no aumento proporcional da intensidade de fluorescência co
J. Braz. Chem. Soc.. Publicado em: 2014-09
-
12. Crystallization of II-VI semiconductor compounds forming long microcrystalline linear assemblies
In this work we report the formation of long microcrystalline linear self-assemblies observed during the thin film growth of several II-VI compounds. Polycrystalline CdTe, CdS, CdCO3, and nanocrystalline CdTe:Al thin films were prepared on glass substrates by different deposition techniques. In order to observe these crystalline formations in the polycrystal
Mat. Res.. Publicado em: 01/02/2013