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  • 1Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, China.

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|February 21, 2022
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Summary

Researchers synthesized sulfur-derived quantum dots (S-QDs) and nanoparticles (NPs) using various sulfur sources. The resulting NSO-QDs show promise as selective fluorescent probes for detecting Ni2+ ions.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Sulfur-derived quantum dots (S-QDs) and nanoparticles (NPs) are emerging nanomaterials with unique optical properties.
  • The precise definition and synthesis of sulfur dots require further investigation, especially concerning the role of stabilizing agents like poly(ethylene glycol) (PEG).

Purpose of the Study:

  • To synthesize and characterize S-QDs, Na2S-derived NPs (NS-NPs), and Na2S2O3--derived QDs (NSO-QDs) using different sulfur sources.
  • To investigate the photophysical properties of these sulfur-based nanomaterials.
  • To evaluate the potential of NSO-QDs as fluorescent probes for metal ion detection.

Main Methods:

  • Synthesis of S-QDs, NS-NPs, and NSO-QDs using sulfur powder, sodium sulfide, and sodium thiosulfate, respectively, with NaOH or H2O2 etching.
  • Characterization of photophysical properties, including excitation-independent and excitation-dependent emission spectra.
  • Application of NSO-QDs as fluorescent probes for Ni2+ detection in aqueous solutions, assessing selectivity, detection limit, linear range, and reusability.

Main Results:

  • S-QDs exhibited excitation-independent emission at 500 nm, while NS-NPs and NSO-QDs showed emission shifts from 480 to 586 nm.
  • Poly(ethylene glycol) (PEG) was identified as crucial for the assembly process, influencing nanoparticle formation.
  • NSO-QDs demonstrated high selectivity and quantitative detection of Ni2+ with a low detection limit (0.18 μM) and wide linear range (8-380 μM), with successful reusability.

Conclusions:

  • The study highlights the importance of PEG in the synthesis of sulfur-based nanomaterials and questions the precise definition of sulfur dots.
  • NSO-QDs are effective fluorescent probes for sensitive and selective Ni2+ detection in complex matrices.
  • The developed NSO-QD probe offers a reusable and reliable method for environmental and biological monitoring of nickel ions.