scholarly journals Influence of Organic Molecules on the Luminescent Properties of Composites Based on CdS Quantum Dots

2017 ◽  
Vol 18 (4) ◽  
pp. 426-430
Author(s):  
V. A. Smyntyna ◽  
V. M. Skobeeva ◽  
K. A. Verheles ◽  
M. V. Malushin
Keyword(s):  
Methylene Blue ◽  
Quantum Dots ◽  
Organic Molecules ◽  
Colloidal Solution ◽  
Luminescent Properties ◽  
Point Of View ◽  
Cds Quantum Dots ◽  
Absorption Region ◽  
Acridine Yellow ◽  
Properties Of Composites

The influence of methylene blue (MB) and acridine yellow (AY) dyes on the spectra of luminescence of CdS with quantum dots (QD) dye composites is investigated. It is shown that the luminescence spectrum of the heterosystem of nanocrystals (NC) CdS – the dye depends on the absorption region of it. The spectrum of the luminescence of the quantum dots is shifted to the red region by the introduction into the colloidal solution of the MB dye and in a case of the insertion of AY the spectrum is shifted into the blue region. The obtained results are explained in a point of view of the transferring the energy from the CdS quantum dots to the dyes by the Forster mechanism.

Synthesis of CdS Quantum Dots for Detection of Copper (II) Using Fluorescence Spectroscopy

2011 ◽  
Vol 306-307 ◽  
pp. 1334-1337 ◽  
Author(s):  
Meng Zhang ◽  
Fu Wei Wan ◽  
Shen Guang Ge ◽  
Jing Hua Yu
Keyword(s):  
Quantum Dots ◽  
Fluorescence Intensity ◽  
Colloidal Solution ◽  
Low Cost ◽  
Aqueous System ◽  
Cds Quantum Dots ◽  
High Quality ◽  
Cds Qds ◽  
Partical Size

We report the synthesis and characterization of a low-cost high-quality CdS quantum dots (QDs).The synthesis was performed in aqueous system. The aqueous CdS colloidal solution was prepared using thioglycollic acid as a capping agent. Zetasizer Nano ZS (Malvern, UK) was employed to characterize the partical size of CdS QDs. The UV-vis and photoluminescence (PL) spectra of samples were systematically characterized (the full width at half maximum was 38 nm). The maximum photoluminescence (PL) quantum yield (QY) was as high as 68.5 %. The fluorescence intensity was enhanced by copper (II). The relative fluorescence intensity was linear to copper (II) concentration over the range 4.0 ×10-6 - 2.8×10-5 g mL-1. The regression equation was ΔIF= 59.07+ 90.57c (c / μg mL-1). The highly monodispersed CdS QDs could be used in many fields.

Spectroscopic investigation of colloidal CdS quantum dots–methylene blue hybrid associates

2014 ◽  
Vol 16 (3) ◽  
Author(s):  
Oleg V. Ovchinnikov ◽  
Michail S. Smirnov ◽  
Tamara S. Shatskikh ◽  
Vladimir Yu. Khokhlov ◽  
Boris I. Shapiro ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Quantum Dots ◽  
Spectroscopic Investigation ◽  
Cds Quantum Dots ◽  
Hybrid Associates ◽  
Colloidal Cds

scholarly journals Passivating effect of ternary alloyed AgZnSe shell layer on the structural and luminescent properties of CdS quantum dots

2019 ◽  
Vol 90 ◽  
pp. 162-170 ◽  
Author(s):  
Oluwasesan Adegoke ◽  
Hanieh Montaseri ◽  
Sifiso A. Nsibande ◽  
Patricia B.C. Forbes
Keyword(s):  
Quantum Dots ◽  
Luminescent Properties ◽  
Shell Layer ◽  
Cds Quantum Dots

Luminescence properties of hydrophilic hybrid associates of colloidal CdS quantum dots and methylene blue

2014 ◽  
Vol 156 ◽  
pp. 212-218 ◽  
Author(s):  
M.S. Smirnov ◽  
O.V. Ovchinnikov ◽  
T.S. Shatskikh ◽  
A.G. Vitukhnovsky ◽  
S.A. Ambrozevich ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Quantum Dots ◽  
Luminescence Properties ◽  
Cds Quantum Dots ◽  
Hybrid Associates ◽  
Colloidal Cds

scholarly journals Transient absorption spectral dynamics of hybrid associates of CdS quantum dots and methylene blue dye

2021 ◽  
Vol 65 (3) ◽  
pp. 281-289
Author(s):  
S. A. Tikhomirov
Keyword(s):  
Methylene Blue ◽  
Quantum Dots ◽  
Energy Transfer ◽  
Transient Absorption ◽  
Blue Dye ◽  
Cds Quantum Dots ◽  
Hybrid Associates ◽  
Reduced Forms ◽  
Methylene Blue Cationic Dye ◽  
Colloidal Cds

The transient absorption spectra dynamics for hybrid associates of colloidal CdS quantum dots, passivated by thioglycolic acid (CdS/TGA QDs), and methylene blue cationic dye molecules (MB+) were studied by femtosecond spectroscopy. It was established that one of the main channels of relaxation of the CdS/TGA QDs excitation energy in hybrid associates based on CdS/TGA QDs and MB+ is a fast energy transfer to the reduced forms of MB+ (MBOH•, MB•) that are formed still at the synthesis stage of samples. This channel strongly competes with the resonant energy transfer from the centers of radiative recombination in quantum dots to MB+. Therefore, for hybrid associates based on QDs/TGA and methylene blue, there is no any noticeable signal of the transient absorption corresponding to the triplet state of MB+ dye, which is then known to be actively involved in charge transfer.

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