Singlet-Oxygen Sensitization by Associates of Methylene Blue with Colloidal Ag2S Quantum Dots Passivated by Thioglycolic Acid

2018 ◽  
Vol 125 (1) ◽  
pp. 107-112 ◽  
Author(s):  
O. V. Ovchinnikov ◽  
M. S. Smirnov ◽  
T. S. Kondratenko ◽  
A. S. Perepelitsa ◽  
I. G. Grevtseva ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Quantum Dots ◽  
Singlet Oxygen ◽  
Thioglycolic Acid ◽  
Ag2s Quantum Dots

scholarly journals Singlet oxygen luminescence detecting in presence of hybrid associates of colloidal Ag2S quantum dots with methylene blue molecules

2016 ◽  
Vol 132 ◽  
pp. 03038
Author(s):  
O.V. Ovchinnikov ◽  
T.S. Kondratenko ◽  
M.S. Smirnov ◽  
A.S. Perepelitsa ◽  
I.G. Grevtseva ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Quantum Dots ◽  
Singlet Oxygen ◽  
Hybrid Associates ◽  
Ag2s Quantum Dots

scholarly journals IR Luminescence of Polyfunctional Associates of Indocianine Green and Ag-=SUB=-2-=/SUB=-S Quantum Dots-=SUP=-*-=/SUP=-

2020 ◽  
Vol 128 (8) ◽  
pp. 1200
Author(s):  
T.S. Kondratenko ◽  
M.S. Smirnov ◽  
O.V. Ovchinnikov ◽  
I.G. Grevtseva ◽  
A.N. Latyshev
Keyword(s):  
Quantum Dots ◽  
Indocyanine Green ◽  
Biological Tissue ◽  
Thioglycolic Acid ◽  
Therapeutic Window ◽  
Polymethine Chain ◽  
Coordination Interaction ◽  
Ag2s Quantum Dots ◽  
Average Size ◽  
Monomer Band

In this work, manifestations of IR luminescence sensitization of Indocyanine Green during conjugation with colloidal Ag2S quantum dots with average size of 2.2 and 3.7 nm, passivated with thioglycolic acid molecules (Ag2S/TGA QDs) are studied using absorption and luminescence techniques. The possibility of enhancing luminescence in the dye monomer band (820 nm) under excitation of 660 nm by a factor of 6 in the presence of Ag2S/TGA QDs (2.2 nm) due to a decrease in the dye polymethine chain due movement via coordination interaction with quantum dots was demonstrated. The way to switch-over from the first therapeutic window of biological tissue transparency (NIR-I, 700-950 nm) to the second (NIR-II, 1000-1700 nm), based on sensitization of IR luminescence of Ag2S/TGA QDs with an average size of 3.7 nm in the region of 1040 nm due to of resonance non-radiative transfer of excitation energy from Ag2S/TGA (2.2 nm) QDs at 900 nm to Ag2S/TGA QDs (3.7 nm) via the J-aggregate of ICG dye, which acts as an exciton bridge.

scholarly journals Spectral properties of hybrid associates of colloidal quantum dots Zn0.5Cd0.5S, europium tenoyltrifluoroacetonate and methylene blue

2018 ◽  
Vol 190 ◽  
pp. 04017 ◽  
Author(s):  
Mikhail S. Smirnov ◽  
Aleksey S. Perepelitsa ◽  
Tamara S. Kondratenko ◽  
Andrey I. Zvyagin ◽  
Oleg V. Ovchinnikov
Keyword(s):  
Methylene Blue ◽  
Quantum Dots ◽  
Thioglycolic Acid ◽  
Simultaneous Increase ◽  
Ir Absorption ◽  
Spectroscopy Technique ◽  
Absorption Bands ◽  
Time Resolved ◽  
Hybrid Associates ◽  
State Luminescence

Hybrid associates formed from colloidal Zn0.5Cd0.5S quantum dots, passivated with thioglycolic acid, europium tenoyltrioteracetonate and methylene blue molecules, absorption, luminescence, IR and time-resolved spectroscopy technique are studied. The shift of the IR absorption bands of COO- and C=O groups of thioglycolic acid and europium thenoyltrifluoroacetonate has been detected. An increase in the efficiency of excitation of europium luminescence and a simultaneous increase lifetime of its luminescence upon adsorption on Zn0.5Cd0.5S quantum dots were found. Addition of methylene blue (thionine) molecules leads to quenching of the trap state luminescence of Zn0.5Cd0.5S and intracentric luminescence of Eu3+. A conclusion about the adsorption of Eu3+ on the surface of Zn0.5Cd0.5S quantum dots and the nonradiative energy transfer to methylene blue molecules was made.

Photoexcitation dynamics in hybrid associates of Ag2S quantum dots with methylene blue

2021 ◽  
Vol 232 ◽  
pp. 117794
Author(s):  
M.S. Smirnov ◽  
O.V. Buganov ◽  
S.A. Tikhomirov ◽  
O.V. Ovchinnikov
Keyword(s):  
Methylene Blue ◽  
Quantum Dots ◽  
Hybrid Associates ◽  
Ag2s Quantum Dots

scholarly journals Spectral manifestations of the exciton-plasmon interaction of Ag2S quantum dots with silver and gold nanoparticles

2021 ◽  
Vol 23 (1) ◽  
pp. 25-31
Author(s):  
Irina G. Grevtseva ◽  
Tamara A. Chevychelova ◽  
Violetta N. Derepko ◽  
Oleg V. Ovchinnikov ◽  
Mikhail S Smirnov ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Silver Nanoparticles ◽  
Gold Nanorods ◽  
Thioglycolic Acid ◽  
Hybrid Nanostructures ◽  
Luminescence Spectra ◽  
Ag Nps ◽  
Fano Effect ◽  
Pyramidal Geometry ◽  
Ag2s Quantum Dots

The purpose of our study was to develop methods for creating hybrid nanostructures based on colloidal Ag2S quantum dots, pyramidal silver nanoparticles, Au nanorods, and to determine the spectral-luminescent manifestations of exciton-plasmon interactions in these structures. The objects of the study were Ag2S quantum dots passivated with thioglycolic acid (Ag2S/TGA QDs) and 2-mercaptopropionic acid (Ag2S/2-MPA QDs), gold nanorods (Au NRs), silver nanoparticles with pyramidal geometry (Ag NPs), and their mixtures. The spectral properties were studied using a USB2000+ with a PMC-100-20 photomultiplier system (Becker & Hickl Germany). The article considers the transformation of the luminescence spectra of colloidal Ag2S/TGA QDs and Ag2S/2-MPA QDs in mixtures with pyramidal Ag NPs and Au NRs. The study demonstratedthe presence of the effects of the contour transformation of the luminescence spectra due to the Fano effect, as well as the luminescence quenching following direct contact between QDs and NPs

Effect of thioglycolic acid molecules on luminescence properties of $$\hbox {Ag}_2$$Ag2S quantum dots

2020 ◽  
Vol 52 (4) ◽  
Author(s):  
Oleg V. Ovchinnikov ◽  
Irina G. Grevtseva ◽  
Mikhail S. Smirnov ◽  
Tamara S. Kondratenko ◽  
Aleksey S. Perepelitsa ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Thioglycolic Acid ◽  
Luminescence Properties ◽  
Ag2s Quantum Dots

scholarly journals Electrochemical quantification of Ag2S quantum dots: evaluation of different surface coating ligands for bacteria determination

2020 ◽  
Vol 187 (3) ◽  
Author(s):  
Olaya Amor-Gutiérrez ◽  
Alba Iglesias-Mayor ◽  
Pablo Llano-Suárez ◽  
José M. Costa-Fernández ◽  
Ana Soldado ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Coating ◽  
Ag2s Quantum Dots

Electrochemiluminescent chiral discrimination with chiral Ag2S quantum dots/few-layer carbon nitride nanosheets

The Analyst ◽  
2021 ◽  
Author(s):  
Qianqian Zhao ◽  
Wenrong Cai ◽  
Bao-Zhu Yang ◽  
Zhengzhi Yin ◽  
Datong Wu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Nitride ◽  
Chiral Discrimination ◽  
Chiral Ligand ◽  
Two Dimensional ◽  
Ag2s Quantum Dots ◽  
Carbon Nitride Nanosheets

Well dispersed chiral Ag2S quantum dots (Ag2S QDs) were facilely synthesized by using N-acetyl-L-cysteine (NALC) as the chiral ligand, which were loaded onto the nanosheets of two-dimensional (2D) few-layer carbon...

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