Photoluminescence investigations of sulfur quantum dots synthesized by a bubbling-assisted strategy

Liu, Shuo; Wang, Henggang; Feng, Anrui; Chang, Jianyu; Zhang, Chuanchuan; Shi, Yue; Zhai, Yongqing; Biju, Vasudevanpillai; Wang, Zhenguang

doi:10.1039/d1na00282a

Cited by 21 publications

(13 citation statements)

References 34 publications

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“…(Figure B, red stars). The intensity decreases with time and disappears in SQDs-8 and SQDs-12, and new peaks appear at about 270 and 330 nm (Figure B, black arrows) which are attributed to the band gap transition of atomic sulfur produced from ultra small SQDs, which becomes intense with increasing reaction time . When the reaction reaches 24 h, the SQDs aggregrated to larger size, the two peaks disappear and a peak of 298 nm is formed again which is consistent with SQDs-2.…”

supporting

confidence: 70%

Investigation on Dynamic Changes in the Morphology and Fluorescence Properties of Sulfur Quantum Dots

Wei

Gao

et al. 2022

J. Phys. Chem. Lett.

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Sulfur quantum dots (SQDs), an emerging metal-free quantum dot, which has received intense research interest owing to their unique optical property, good solubility, excellent biocompatibility, and facile synthetic approach. Herein, using sodium hypochlorite as the etching agent, we investigate how it functions and transforms sulfur powder to SQDs and affects the dynamics, photoluminescence, and size changes of SQDs by controlling the reaction time. Precise control of reaction time allows SQDs to be tuned between green and blue (from 515 to 420 nm) with size distribution ranging from 2.0 to 20 nm as well as the occurrence of a distinctive irregular rodlike structure. Surface functional groups and element analysis reveal that the core size and surface oxidizing sulfur species both contribute to the versatile PL properties. Morevoer, we propose a tentative formation mechanism that relies on the oxidizing sulfur surface state and quantum size effect, offering a theoretical and experimental foundation for investigation of we propose a tentative formation mechanism that relies on the oxidizing sulfur surface state and quantum size effect, offering a theoretical and experimental foundation for investigation of the formation and modulation of SQDs.

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supporting

confidence: 70%

Investigation on Dynamic Changes in the Morphology and Fluorescence Properties of Sulfur Quantum Dots

Wei

Gao

et al. 2022

J. Phys. Chem. Lett.

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“…Chalcogen element-containing nanomaterials have exhibited a wealth of intriguing properties. − Particularly, metal-free chalcogen QDs (including sulfur (S) QDs, selenium (Se) QDs, and tellurium (Te) QDs) have gained increasing attention over the years owing to their unique optical properties and good biocompatibility. − Up to now, several strategies have been developed to synthesize chalcogen QDs. For instance, Li and co-workers utilized phase interfacial reactions to prepare S QDs using metal sulfide QDs (including CdS QDs and ZnS QDs) as the raw materials .…”

Section: Introductionmentioning

confidence: 99%

Thiolate-Assisted Route for Constructing Chalcogen Quantum Dots with Photoinduced Fluorescence Enhancement

Zhang

Chen

Guo

et al. 2021

ACS Appl. Mater. Interfaces

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Despite great efforts in the development of diverse nanomaterials, a general route to synthesize metal-free chalcogen quantum dots (QDs) is still lacking. Moreover, the modification of chalcogen QDs is a bottleneck that severely hinders their applications. Herein, we develop a facile method to construct different chalcogen QDs (including S QDs, Se QDs, and Te QDs) with the assistance of thiolates. In addition to stabilizing chalcogen QDs, the thiolates also endow the chalcogen QDs with favorable modifiability. Different from most dyes whose fluorescence is quenched after short-term light irradiation, the prepared chalcogen QDs have significantly enhanced fluorescence emission under continuous light irradiation. Taking advantage of the distinctive photoinduced fluorescence enhancement property, long-time cell imaging with superb performance is realized using the chalcogen QDs. It is envisioned that the chalcogen QDs show promising potential as fluorescent materials in different fields beyond bioimaging.

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“…X-ray photoelectron spectroscopy (XPS) has been employed to identify the chemical composition and chemical state of the S nanomaterials as a function of the PEG-400 amount. The XPS survey spectra (Figure S9) show that the sample surfaces are composed of O, Na (Auger peak at around 497 eV), C, and S. Although the presence of Na in previous studies has been mostly ignored, ,, the Na element is an important component in the resulting S nanostructures. Na plays an important role to stabilize the existing sulfite and thiosulfate species as salts.…”

Section: Resultsmentioning

confidence: 99%

Polyethylene Glycol-Mediated Switchable Blue-Green Emissions in Sulfur Nanostructures Controlled through the Surface Chemistry

et al. 2022

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Metal-free sulfur nanodots are an emerging class of nanoparticles for applications in photonics and nanobiotechnology. Because of the stable photoluminescence (PL) and low toxicity, pure elemental quantum dots, such as S-dots, are excellent candidates for a new generation of 0D nanomaterials. However, they require a proper design to control the PL and obtain an excitation-independent emission. Here, we show that the control of the S nanostructure emission can be achieved by modulating the surface interface with an organic polymer, polyethylene glycol (PEG-400), which is widely used to passivate the nanostructure surface. Blue and green emissions can be switched on or off through PEG-400. The fluorescent S nanomaterials have been synthesized by thermally treating S powders in an alkaline solution and adding controlled amounts of PEG-400. The polymer triggers the formation of organosulfur compounds, with a remarkable modification of the characteristic emission of the S products. The sample emission shifts from blue to green by controlling the polymer concentration in the solution. The intensities of the two emissions can be tuned by adjusting the amount of PEG that favors the surface oxidation of the S nanostructure. A lower degree of oxidation causes an emission in the blue range, and higher oxidation of the sulfur atoms promotes an emission to the green.

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Photoluminescence investigations of sulfur quantum dots synthesized by a bubbling-assisted strategy

Abstract: Sulfur quantum dots (S-dots) emerge as promising luminescent materials owing to their remarkable optical properties. However, the mechanisms of their formation and photoluminescence remain concealed. We reveal these mechanisms by...

Cited by 21 publications

References 34 publications

Investigation on Dynamic Changes in the Morphology and Fluorescence Properties of Sulfur Quantum Dots

Investigation on Dynamic Changes in the Morphology and Fluorescence Properties of Sulfur Quantum Dots

Thiolate-Assisted Route for Constructing Chalcogen Quantum Dots with Photoinduced Fluorescence Enhancement

Polyethylene Glycol-Mediated Switchable Blue-Green Emissions in Sulfur Nanostructures Controlled through the Surface Chemistry

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