Development of highly luminescent and cytocompatible near-IR-emitting aqueous Ag2S quantum dots

Hocaoglu, Ibrahim; Çizmeciyan, M. Natali; Erdem, Rengin; Özen, Can; Kurt, Adnan; Sennaroğlu, Alphan; Acar, Havva Yağcı

doi:10.1039/c2jm31959d

Cited by 149 publications

(123 citation statements)

References 42 publications

(58 reference statements)

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“…The bands in the region of 1571.2 cm -1 to the 1427.5 cm -1 regions were attributed to the asymmetrical and symmetrical stretching of COO -group. [35][36][37] Calculating the difference, delta (Δ), between the asymmetrical and symmetrical stretching bands yields a value of 143.7 cm -1 which is known in the literature as the ionic delta of some carboxylates, consistent with the pH of the sample. In Figure 4 we observed the DSC curve of the sample in a nitrogen atmosphere to show possible phase changes.…”

Section: 34mentioning

confidence: 82%

Aqueous Nanofluids Based on Copper MPA: Synthesis and Characterization

et al. 2018

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The application and use of efficient cooling fluids have become increasingly important due to the increasing industrial and energy demand associated with the miniaturization of various electronic devices. The search for high-efficiency heat exchanger fluids in the early 1990s led to the development of a new class of refrigerants called nanofluids. The use of nanofluids is linked to obtaining stable colloidal dispersions which exhibit high thermal conductivity. For this purpose, the efficiency of a nanofluid will depend on the type of fluid used and the dispersed nanomaterial. In this work, a stable aqueous nanofluid based on mercaptopropionic acid-coated copper sulfide nanoparticles (Cu 2 S/MPA), synthesized by the chemical reduction method, was developed. The nanofluid presented colloidal stability in alkaline medium and an average increase of 36% in thermal conductivity for a volumetric fraction of 0.05%.

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Section: 34mentioning

confidence: 82%

Aqueous Nanofluids Based on Copper MPA: Synthesis and Characterization

et al. 2018

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“…Ag 2 S QDs have a band gap of 0.9 eV and they can be excited with visible light and emit in the near-infrared region (NIR). Besides, Ag 2 S QDs are highly cytocompatible even without PEGylation and used for in vitro and in vivo imaging [32][33][34][35]. Such a combination offers many advantages over existing hybrid compositions in medical/biotechnology applications: (1) Excitation in the visible region, (2) no autofluoresence from the natural biological components in the NIR, (3) increased penetration depth, (4) reduced or no absorption of emitted photons by SPIONs, (5) enhanced cytocompatibility, (6) multimodality: optical and magnetic resonance imaging where neither modality (optical and magnetic) pose ionizing radiation, imaging, magnetic targeting and hyperthermia.…”

Section: Introductionmentioning

confidence: 99%

“…With this motivation, we demonstrate here the synthesis of Fe 3 O 4 -Ag 2 S superparamagnetic-luminescent hybrid nanoparticles utilizing a simple single step ligand exchange procedure in which lauric acid (LA) coating of SPIONs are exchanged with the carboxylic acid groups residing on the surface of 2-mercaptopropionic acid coated Ag 2 S NIRQDs. Both LA-SPIONs and 2MPA-Ag 2 S NIRQDs were prepared according to our previously published methods [29,32]. Another important advantage of this system is the high quantum yield (up to 30% with respect to LDS 798 NIR dye) of the 2MPA-Ag 2 S NIRQDs.…”

Section: Introductionmentioning

confidence: 99%

Cyto/hemocompatible magnetic hybrid nanoparticles (Ag2S–Fe3O4) with luminescence in the near-infrared region as promising theranostic materials

Hocaoglu

Asik

Ulusoy

et al. 2015

Colloids and Surfaces B: Biointerfaces

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“…It is possible due to their intense IR luminescence. Luminescence in the region of 800-1200 nm corresponds to the therapeutic window of transparency of biological objects [1][2][3]. Hybrid association of Ag2S QDs with molecules of thiazine dyes opens additional possibilities to control the quantum yield of QDs luminescence [3], and also to photosensitize singlet oxygen ( 1 O2).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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Abstract.In our work we demonstrate some spectroscopic investigation of colloidal Ag2S QDs associates with methylene blue. The photosensitizing of singlet oxygen by associates of colloidal Ag2S QDs with methylene blue was found.Colloidal Ag2S quantum dots (QDs) are promising material for fluorescent labeling of biological objects, including tissues affected by severe diseases. It is possible due to their intense IR luminescence. Luminescence in the region of 800-1200 nm corresponds to the therapeutic window of transparency of biological objects [1][2][3]. Hybrid association of Ag2S QDs with molecules of thiazine dyes opens additional possibilities to control the quantum yield of QDs luminescence [3], and also to photosensitize singlet oxygen ( 1 O2). This is interesting for photodynamic therapy, particularly in combination with high-contrast fluorescent marking [4,5]. Furthermore, conjugation of QDs with dye molecules can to provide higher stability of dye, for example, methylene blue (MB) in the form, which produces singlet oxygen [6].There is a problem of unambiguous fluorescent detection of singlet oxygen in the region of 1270 nm due to Ag2S QDs luminescence with peak at 1200 nm for most of known methods of their synthesis. This problem is also deepened due to significant duration of luminescence decay of Ag2S QDs, which is overlapped with kinetics of luminescence of singlet oxygen. Therefore we solved the problem of changing the position of IR luminescence peak of Ag2S QDs. This peak has weak size dependence. Its position was changed by replacing of stabilizer. Colloidal Ag2S QDs were synthesized in aqueous gelatin solution and using thioglycolic acid (TGA).The possibility of singlet oxygen photosensitization in water-ethanol solutions of mixtures of colloidal semiconductor Ag2S QDs, conjugated with MB molecules was investigated for synthesized samples. We used colloidal semiconductor Ag2S QDs with average size of 2.2 -3.0 nm and MB molecules with concentration, provided QDs:MB=1:3 and QDs:MB=1:8 ratio respectively.Detection of singlet oxygen production was realized using a technique, based on the measurement of 1 O2 molecules phosphorescence at 1270 nm. Registration of 1 O2 molecules phosphorescence was realized using a highly stable low-noise photodiode PDF-10C/M and

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Development of highly luminescent and cytocompatible near-IR-emitting aqueous Ag2S quantum dots

Cited by 149 publications

References 42 publications

Aqueous Nanofluids Based on Copper MPA: Synthesis and Characterization

Aqueous Nanofluids Based on Copper MPA: Synthesis and Characterization

Cyto/hemocompatible magnetic hybrid nanoparticles (Ag2S–Fe3O4) with luminescence in the near-infrared region as promising theranostic materials

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

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Development of highly luminescent and cytocompatible near-IR-emitting aqueous Ag2S quantum dots

Cited by 149 publications

References 42 publications

Aqueous Nanofluids Based on Copper MPA: Synthesis and Characterization

Aqueous Nanofluids Based on Copper MPA: Synthesis and Characterization

Cyto/hemocompatible magnetic hybrid nanoparticles (Ag2S–Fe3O4) with luminescence in the near-infrared region as promising theranostic materials

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

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