Polyvinylpyrrolidone as a Stabilizer in Synthesis of AgInS2 Quantum Dots

Korepanov, O. A.; Александрова, О.В.; Firsov, D. D.; Kalazhokov, Z. Kh.; Kirilenko, D. A.; Kozodaev, Dmitriy; Matveev, Vasilii; Mazing, D. S.; Мошников, В. А.

doi:10.3390/nano12142357

Cited by 9 publications

(4 citation statements)

References 38 publications

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“…In [50], the authors suggested that thiol groups could influence the PL emission properties of aqueous I-III-VI QDs through the transfer of a hole to the redox level of surface-bound disulfides formed via ligand oxidation. In our previous work [21], though, we observed very little narrowing of the PL curve with decreasing temperature for non-thiol (thiol-less) PVP-capped AgInS 2 QDs. It is likely that the stabilization mechanism of these QDs is based on the interaction of oxygen from PVP with the QD surface.…”

Section: Temperature-dependent Photoluminescencementioning

confidence: 53%

“…Aqueous techniques become even more relevant in the case of I-III-VI nanocrystals, which are typically synthesized in nonpolar media employing aliphatic thiols as coordinating ligands, resulting in the strong coordination of surface groups and hindering ligand exchange. The synthesis of ternary and quaternary QDs in aqueous medium can be achieved using a various types of capping ligands such as thiols [15,16], amino-acids [17][18][19], polymers [20,21], etc., providing excellent long-term colloidal stability.…”

Section: Introductionmentioning

confidence: 99%

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Temperature- and Size-Dependent Photoluminescence of CuInS2 Quantum Dots

Korepanov,

Kozodaev,

Aleksandrova

et al. 2023

Nanomaterials

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We present the results of a temperature-dependent photoluminescence (PL) spectroscopy study on CuInS2 quantum dots (QDs). In order to elucidate the influence of QD size on PL temperature dependence, size-selective precipitation was used to obtain several nanoparticle fractions. Additionally, the nanoparticles’ morphology and chemical composition were studied using transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The obtained QDs showed luminescence in the visible–near infrared range. The PL energy, linewidth, and intensity were studied within an 11–300 K interval. For all fractions, a temperature decrease led to a shift in the emission maximum to higher energies and pronounced growth of the PL intensity down to 75–100 K. It was found that for large particle fractions, the PL intensity started to decrease, with temperature decreasing below 75 K, while the PL intensity of small nanoparticles remained stable.

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Section: Temperature-dependent Photoluminescencementioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Temperature- and Size-Dependent Photoluminescence of CuInS2 Quantum Dots

Korepanov,

Kozodaev,

Aleksandrova

et al. 2023

Nanomaterials

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“…Meanwhile, PVP had good water solubility and biocompatibility. , PVP was employed to control the growth of MOF crystals, regulate nanoparticle size and shape, and avoid self-aggregation . The ZIF-8 morphology was changed by adding different surfactants, including PVP, poly(ethylene glycol), tannin (TA), cetyltrimethylammonium bromide (CTAB), and sodium dodecyl sulfate .…”

Section: Introductionmentioning

confidence: 99%

Modulated Growth of MOFs to Fabricate ZIF-8@Chitosan/Polyvinylpyrrolidone Hydrogels with Improved Adsorption Capacity for CO₂

He,

Li,

Shi

et al. 2024

ACS Appl. Polym. Mater.

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ZIF-8@chitosan (CS)/polyvinylpyrrolidone (PVP) hydrogels (CP x HGZ) were fabricated by in situ growth of metal− organic framework (MOF) crystals on the network of CS/PVP semiinterpenetrating hydrogels. The ZIF-8 crystals were assembled in the channel of hydrogel and coated by networks of hydrogel. Morphology and distribution of the ZIF-8 crystals in CS/PVP hydrogels were modulated by the polymer network of hydrogels. PVP played a key role in guiding the growth of ZIF-8 crystals and preventing aggregation of ZIF-8 crystals in the network of CS/PVP hydrogel. Additionally, the PVP content in hydrogels influencing the adsorption capacity of CP x HGZ for CO 2 was explored. With increasing PVP content in the hydrogels, the equilibrium adsorption of CP x HGZ for CO 2 was increased. Especially, the equilibrium adsorption of CP 10 HGZ for CO 2 was increased by 22%, which was higher than that of the pure ZIF-8 crystals. The results of kinetic simulation, XRD spectra, and FT-IR spectra revealed that the adsorption mechanism of CP x HGZ for CO 2 was mainly chemisorption. The presence of multisites, including the amine groups in CS and PVP as well as metals in ZIF-8, was beneficial for enhancing the adsorption capacity of CP x HGZ for CO 2 .

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“…Hence, in this study, AgIn standard card JCPDS 25-1330 [29] . By comparing the characteristic peaks AgInS 2 -SnIn 4 S 8 at different ratios, AgInS 2 -SnIn 4 S 8 (1:0.5) has the best crystalline structure and is expected to exhibit the best photocatalytic activity in multimodal photocatalytic performance studies.…”

Section: Introductionmentioning

confidence: 99%

Flower Globose AgIn5S8/AgInS2–SnIn4S8 Heterojunction Composites Constructed by Microwave-Assisted Hydrothermal Synthesis for Enhanced Photocatalytic Efficiency Toward Methyl Orange

Wang

Liu

et al. 2023

J Inorg Organomet Polym

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Ternary metal sul des normally have narrow band gap energy levels, leading to fast recombination of photogenerated electron pairs. Design and construction of composites with heterojunctions is one of the effective ways to improve this disadvantage. In this paper, different ratios of AgInS2-SnIn4S8 composites were synthesized by a microwave-assisted hydrothermal method, and the molar ratio of SnIn4S8:AgInS2=0.5:1 was determined as the optimal ratio based on the experimental results of visible photocatalytic degradation of methyl orange (MO). Furthermore, AgIn5S8/AgInS2-SnIn4S8 composites were successfully prepared by changing the feeding ratio of In and S elements. The constitution, structural morphology and surface physicochemical properties of the composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), ultravioletvisible diffuse re ectance absorption spectroscopy (UV-vis/DRS) and nitrogen adsorption-desorption tests. The results show that AgIn5S8/AgInS2-SnIn4S8 composites have a ower globose structure with uniform size distribution, and AgInS2 and AgIn5S8 are compounded with SnIn4S8 to form a heterogeneous structure. After recombination, light absorption properties are changed and light absorption range is broadened due to stronger light absorption capacity in AgInS2 and AgIn5S8. As they have matched energy band structures, the electron transfer paths are increased and the e--h+ lifetime is prolonged, which leads to enhanced photocatalytic performance of AgIn5S8/AgInS2-SnIn4S8 composites. Moreover, the formation of regular and homogeneous ower globose structure under the effect of microwave polarization also has an important contribution to the improvement of their photocatalytic performance. AgIn5S8/AgInS2-SnIn4S8 composites exhibit a certain degradation ability towards MO, and the degradation is almost complete within 180 min under UV light. Finally, through trapping experiments with the addition of different radical trapping agents, photocatalytic active species are identi ed, and thus the possible photocatalytic reaction mechanism of AgIn5S8/AgInS2-SnIn4S8 composites was inferred.

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Polyvinylpyrrolidone as a Stabilizer in Synthesis of AgInS2 Quantum Dots

Cited by 9 publications

References 38 publications

Temperature- and Size-Dependent Photoluminescence of CuInS2 Quantum Dots

Temperature- and Size-Dependent Photoluminescence of CuInS2 Quantum Dots

Modulated Growth of MOFs to Fabricate ZIF-8@Chitosan/Polyvinylpyrrolidone Hydrogels with Improved Adsorption Capacity for CO₂

Flower Globose AgIn5S8/AgInS2–SnIn4S8 Heterojunction Composites Constructed by Microwave-Assisted Hydrothermal Synthesis for Enhanced Photocatalytic Efficiency Toward Methyl Orange

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Polyvinylpyrrolidone as a Stabilizer in Synthesis of AgInS2 Quantum Dots

Cited by 9 publications

References 38 publications

Temperature- and Size-Dependent Photoluminescence of CuInS2 Quantum Dots

Temperature- and Size-Dependent Photoluminescence of CuInS2 Quantum Dots

Modulated Growth of MOFs to Fabricate ZIF-8@Chitosan/Polyvinylpyrrolidone Hydrogels with Improved Adsorption Capacity for CO2

Flower Globose AgIn5S8/AgInS2–SnIn4S8 Heterojunction Composites Constructed by Microwave-Assisted Hydrothermal Synthesis for Enhanced Photocatalytic Efficiency Toward Methyl Orange

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Modulated Growth of MOFs to Fabricate ZIF-8@Chitosan/Polyvinylpyrrolidone Hydrogels with Improved Adsorption Capacity for CO₂