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Related Concept Videos

Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Sample Preparation for Analysis: Advanced Techniques

Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...

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Solvent-Type Passivation Strategy Controls Solid-State Self-Quenching-Resistant Behavior in Sulfur Dots.

Chuqiao Wu1, Shuting Zhang2, Yuhui Zheng1

  • 1School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine, South China Normal University, Guangzhou510006, China.

Inorganic Chemistry
|December 15, 2022
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Researchers developed a new solvent-type passivation (STP) method for sulfur dots, replacing polyethylene glycol (PEG). This strategy enhances luminescence and deep-red emission, improving optoelectric applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photochemistry

Background:

  • Polyethylene glycol (PEG) treatment of sulfur dots (SDs) yields high luminescence quantum yield but hinders electron transfer due to its thick insulating layer.
  • Long-chain polymers like PEG can complicate SD structure and alter physical characteristics, limiting optoelectric applications.
  • A need exists for alternative passivation strategies that improve control, reproducibility, and performance of sulfur dots.

Purpose of the Study:

  • To introduce a novel solvent-type passivation (STP) strategy for sulfur dots, eliminating the need for PEG or other capping agents.
  • To enhance the luminescence properties and red-shift the emission of sulfur dots for improved optoelectric performance.
  • To investigate the passivation mechanism and its impact on the photophysical properties of sulfur dots.

Main Methods:

  • A solvent-type passivation (STP) strategy was employed using ethanol and sodium hydroxide (NaOH).
  • Ethanol reacted with NaOH to generate sodium ethoxide, which passivated surface defects on sulfur dots.
  • Density functional theory (DFT) calculations were used to analyze the surface passivation mechanism and electronic structure.

Main Results:

  • STP-enhanced emission sulfur dots (STPEE-SDs) exhibited resistance to self-quenching in the solid state.
  • A significant red-shift in fluorescence emission was achieved, extending to 645 nm with a decent quantum yield of 8.7%.
  • STPEE-SDs displayed a large Stokes shift (300 nm) and a long decay lifetime (109 μs), beneficial for reducing background noise.

Conclusions:

  • The STP strategy offers a breakthrough for sulfur dot preparation, enabling better control and reproducibility compared to PEG-based methods.
  • Sodium ethoxide passivation is dynamically favorable, effectively addressing sulfur vacancies and facilitating charge transfer for enhanced luminescence.
  • The developed STPEE-SDs show great potential for optoelectric applications due to their improved photophysical properties and deep-red emission.