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Synthesis of Near-Infrared Emitting Gold Nanoclusters for Biological Applications
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Facile method for iodide ion detection via the fluorescence decrease of dihydrolipoic acid/beta-cyclodextrin

Shu Huan Ren1, Shi Gang Liu1, Yu Ling1

  • 1Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|January 15, 2019
PubMed
Summary
This summary is machine-generated.

Novel red-emitting silver nanoclusters (Ag NCs) were developed for sensitive iodide ion (I-) detection. These functionalized Ag NCs aggregate and lose fluorescence in the presence of I-, enabling highly accurate sensing.

Keywords:
Ag nanoclustersBeta-cyclodextrinDihydrolipoic acidFluorescent probeIodide ion

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Area of Science:

  • Nanomaterials Science
  • Analytical Chemistry
  • Biochemistry

Background:

  • Silver nanoclusters (Ag NCs) are promising fluorescent materials.
  • Developing selective and sensitive probes for iodide ion (I-) detection remains a challenge.

Purpose of the Study:

  • To synthesize novel photoluminescent Ag NCs for iodide ion detection.
  • To investigate the mechanism of iodide ion sensing using these nanoclusters.

Main Methods:

  • Synthesis of Ag NCs stabilized by dihydrolipoic acid (DHLA) and beta-cyclodextrin (β-CD).
  • Characterization of DHLA/β-CD-Ag NCs using spectroscopy and microscopy.
  • Evaluation of the fluorescence response of DHLA/β-CD-Ag NCs to iodide ions.

Main Results:

  • DHLA/β-CD-Ag NCs exhibit red emission and good water solubility.
  • Iodide ions induce aggregation and fluorescence quenching of DHLA/β-CD-Ag NCs.
  • The sensing mechanism involves host-guest complexation between β-CD cavities and iodide ions.

Conclusions:

  • DHLA/β-CD-Ag NCs serve as an effective fluorescent probe for iodide ion detection.
  • The probe demonstrates a low limit of detection (0.06 μM), suitable for practical applications.