Formation of AgInS2/ZnS Colloidal Nanocrystals and Their Photoluminescence Properties

Korepanov, O. A.; Mazing, D. S.; Александрова, О.В.; Мошников, В. А.; Komolov, A. S.; Lazneva, E. F.; Kirilenko, D. A.

doi:10.1134/s1063783419120217

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…Figure 4 a shows the absorption spectra of AgInS 2 QDs at different amounts of PVP. A broad and featureless absorption curve with a long absorption tail in the low-energy area without clearly defined excitonic maxima were observed for all samples [ 26 , 27 ]. The variation of the PVP concentration did not affect either the form or the position of the absorption band.…”

Section: Resultsmentioning

confidence: 99%

“…The PL measurement results presented in Figure 4 b are in good agreement with similar works where these types of QDs were stabilized using L-glutathione [ 28 ] or mercaptopropionic acid [ 29 ]. The variation of the molar ratio between metals of groups I and III in I–III–VI QDs led to a change in the energy gap and the PL peak position [ 26 , 27 ]. The decrease in the molar ratio [Ag]:[In] may lead to a change of the predominant defect-related luminescent channel as well as to a widening of the band gap.…”

Section: Resultsmentioning

confidence: 99%

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Polyvinylpyrrolidone as a Stabilizer in Synthesis of AgInS2 Quantum Dots

et al. 2022

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A synthesis protocol of polyvinylpyrrolidone-capped AgInS2 quantum dots in aqueous solution is reported. Nanoparticle morphology and chemical composition were studied by means of TEM, XRD, XPS, and FTIR. The obtained quantum dots were luminescent in the visible range. The photoluminescence intensity dependence on the polyvinylpyrrolidone amount was demonstrated. The wavelength of the emission maximum varied with changing the [Ag]:[In] molar ratio. The temperature dependence of the photoluminescence intensity of the polyvinylpyrrolidone-capped AgInS2 quantum dots was investigated within the temperature range of 11–294 K.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Polyvinylpyrrolidone as a Stabilizer in Synthesis of AgInS2 Quantum Dots

et al. 2022

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“…The fast injection of 1 mmol of Na 2 S • 9H 2 O into the cation precursor solution resulted in instantaneous nucleation. The particles were grown for 30 min at the temperature of 95−100 • C. The typical samples of the synthesized colloidal quantum dots are characterized in the studies [48,49]. The produced solution of the AgInS 2 CQDs was purified by adding isopropyl alcohol as a precipitant to be subsequently centrifuged.…”

Section: Materials and Research Techniquesmentioning

confidence: 99%

Sensitization of ZnO nanorods by AgInS-=SUB=-2-=/SUB=- colloidal quantum dots for adsorption gas sensors with light activation

et al. 2022

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A low-temperature technique for the formation of coatings based on ZnO nanorods decorated with colloidal AgInS2 quantum dots is presented. It is shown that ZnO nanocrystals and colloidal AgInS2 quantum dots with a shell of mercaptopropionic acid molecules form a heterojunction. Sensitization of ZnO nanorods with AgInS2 colloidal quantum dots to visible irradiation provides a gas analytical response of the structure to isopropyl alcohol vapor at room temperature under blue LED illumination with a peak wavelength of 460 nm. Keywords: adsorption gas sensors, photoactivation of gas sensitivity, zinc oxide nanorods, AgInS2 colloidal quantum dots, sensitization.

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“…The third one, namely hot-injection method, presents the reaction of precursors by injecting one of the precursor into the others. In this case, the S precursor dissolved in a suitable solvent was usually injected into the mixture of cation Ag and In precursors [22][23][24]. The fourth group of synthesis methods prepared the Ag 2 S or In 2 S 3 templates and followed by the cation exchange [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Double-shelling AgInS₂ nanocrystals with GaS _x /ZnS to make them emit bright and stable excitonic luminescence

et al. 2023

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This paper presents the successful synthesis of AgInS2 nanocrystals (NCs) double-shelled with GaSx and ZnS for emitting bright and narrow excitonic luminescence from AgInS2 core NCs. Additionally, the AgInS2/GaSx/ZnS NCs with a core/double-shell structure have demonstrated high chemical and photochemical stability. The AgInS2/GaSx/ZnS NCs were prepared via three steps: (i) synthesis of AgInS2 core NCs by solvothermal method at 200 oC for 30 min, (ii) shelling GaSx on AgInS2 core NCs at 280 oC for 60 min to produce the AgInS2/GaSx core/shell structure, and (iii) the outermost ZnS shelling at 140 °C for 10 min. The synthesized NCs were characterized in detail by using appropriate techniques such as X-ray diffraction (XRD), transmission electron microscopy (TEM), and optical spectroscopies. The luminescence evolution of the synthesized NCs is as follows: from the broad spectrum (peaking at 756 nm) of the AgInS2 core NCs to become the narrow excitonic emission (at 575 nm) prominent beside the broad one after shelling with GaSx, then only the bright excitonic luminescence (at 575 nm) without broad emission after double-shelling with GaSx/ZnS. The double-shell has made the AgInS2/GaSx/ZnS NCs not only remarkably enhance their luminescence quantum yield (QY) up to ~60% but also maintain the narrow excitonic emission stably for a long-term storage over 12 months. The outermost ZnS shell is believed to play a key role in enhancing QY and protecting AgInS2 and AgInS2/GaSx from certain damage.

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Formation of AgInS2/ZnS Colloidal Nanocrystals and Their Photoluminescence Properties

Cited by 6 publications

References 7 publications

Polyvinylpyrrolidone as a Stabilizer in Synthesis of AgInS2 Quantum Dots

Polyvinylpyrrolidone as a Stabilizer in Synthesis of AgInS2 Quantum Dots

Sensitization of ZnO nanorods by AgInS-=SUB=-2-=/SUB=- colloidal quantum dots for adsorption gas sensors with light activation

Double-shelling AgInS₂ nanocrystals with GaS _x /ZnS to make them emit bright and stable excitonic luminescence

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Formation of AgInS2/ZnS Colloidal Nanocrystals and Their Photoluminescence Properties

Cited by 6 publications

References 7 publications

Polyvinylpyrrolidone as a Stabilizer in Synthesis of AgInS2 Quantum Dots

Polyvinylpyrrolidone as a Stabilizer in Synthesis of AgInS2 Quantum Dots

Sensitization of ZnO nanorods by AgInS-=SUB=-2-=/SUB=- colloidal quantum dots for adsorption gas sensors with light activation

Double-shelling AgInS2 nanocrystals with GaS x /ZnS to make them emit bright and stable excitonic luminescence

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About

Double-shelling AgInS₂ nanocrystals with GaS _x /ZnS to make them emit bright and stable excitonic luminescence