Dual Functional Hydrogen Peroxide Boosted One Step Solvothermal Synthesis of Highly Uniform Sulfur Quantum Dots at Elevated Temperature and Their Fluorescent Sensing

Pan

et al. 2022

Dalton Trans.

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“…Inspired by the above solvent-dependent PL properties, selecting an appropriate reaction solvent seems to play a vital role in the synthesis of SQDs. 20,21…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Manipulating time-dependent size distribution of sulfur quantum dots and their fluorescence sensing for ascorbic acid

Pan

et al. 2022

Dalton Trans.

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“…The absorption peak at 1467 and 1121 cm −1 may be attributed to the asymmetric and symmetric stretching vibrations of S� O, which shows distinctly enhanced peaks in SQDs-8, SQDs-12, and SQDs-24, while it can be negligible in SQDs-2. 20,29 Compared to the SQDs-2, the SQDs-8, SQDs-12, and SQDs-24 show distinctly enhanced peaks at 1019 and 1261 cm −1 caused by the stretching vibration of C−O, 27 indicating the participation of oxygen-containing groups. Importantly, the peaks of 802 and 601 cm −1 appeared at SQDs-8, SQDs-12, and SQDs-24 h were attributed to the S−O bending vibration, which are negligible for SQDs-2, indicating further oxidation of the surface of the SQDs with increasing reaction time.…”

mentioning

confidence: 99%

“…Based on the above two methods, our group proposed a bifunctional H 2 O 2 -assisted strategy for the one-step synthesis of SQDs which greatly simplified the procedure and exhibited uniform size distribution as well as excellent PL performance with QYs up to 10.3%. 20 Through appropriate selection of etching agent, SQDs can be also successfully prepared. Zhou's group proposed the preparation of SQDs by an oxygen-assisted method; providing a pure oxygen atmosphere to the synthesis system can alter the reaction route by oxidizing polysulfide species to elemental sulfur.…”

mentioning

confidence: 99%

“…Importantly, the peaks of 802 and 601 cm −1 appeared at SQDs-8, SQDs-12, and SQDs-24 h were attributed to the S−O bending vibration, which are negligible for SQDs-2, indicating further oxidation of the surface of the SQDs with increasing reaction time. 20,30 Moreover, Raman spectra were also employed to verify the successful synthesis of SQDs. As depicted in Figure S5, all of the SQDs-2, SQDs-8, SQDs-12, and SQDs-24 show same characteristic Raman peaks.…”

mentioning

confidence: 99%

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

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.

Shaping Sulfur Precursors to Low Dimensional (0D, 1D and 2D) Sulfur Nanomaterials: Synthesis, Characterization, Mechanism, Functionalization, and Applications

Guo

et al. 2023

Small

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Low‐dimensional sulfur nanomaterials featuring with 0D sulfur nanoparticles (SNPs), sulfur nanodots (SNDs) and sulfur quantum dots (SQDs), 1D sulfur nanorods (SNRs), and 2D sulfur nanosheets (SNSs) have emerged as an environmentally friendly, biocompatible class of metal‐free nanomaterials, sparking extensive interest in a wide range application. In this review, various synthetic methods, precise characterization, creative formation mechanism, delicate functionalization, and versatile applications of low dimensional sulfur nanomaterials over the last decades are systematically summarized. Initially, it is striven to summarize the progress of low dimensional sulfur nanomaterials from versatile precursors by using different synthetic approaches and various characterization. Then, a multi‐faceted proposed formation mechanism with emphasis on how these different precursors produce corresponding SNPs, SNDs, SQDs, SNRs, and SNSs is highlighted. Besides, it is essential to fine‐tune the surface functional groups of low dimensional sulfur nanomaterials to form new complex nanomaterials. Finally, these sulfur nanomaterials are being investigated in bio‐sensing, bio‐imaging, lithium–sulfur batteries, antibacterial activities, plant growth along with future perspective and challenges in emerging fields. The purpose of this review is to tailor low dimensional nanomaterials through accurately selecting precursors or synthetic approach and provide a foundation for the formation of versatile sulfur nanostructure.