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Related Experiment Video

Updated: Jul 15, 2025

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Kinetically Controlled Structural Modulation of the Self-Assembled Silver Nanoclusters.

Ning Feng1, Zhi Wang1, Di Sun1

  • 1Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong, 250100, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|October 4, 2023
PubMed
Summary

Researchers developed a method to control the self-assembly of silver nanoclusters (Ag9-NCs) using crystallization-induced self-assembly (CISA). This technique manipulates nanowire structure and optical properties, enhancing circularly polarized phosphorescence (CPP) through kinetic control.

Keywords:
chiralitycircularly polarized phosphorescencekineticmetal nanoclustersnanowires

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Metal nanoclusters (NCs) are key building blocks in supramolecular chemistry.
  • Enhanced optical properties like aggregation-induced emission (AIE) are observed in ordered NC structures.
  • Controlling the self-assembly of NCs, especially under kinetic control in multicomponent systems, remains challenging.

Purpose of the Study:

  • To investigate the crystallization-induced self-assembly (CISA) of silver nanoclusters (Ag9-NCs).
  • To explore the manipulation of self-assembled nanostructures and their optical properties through kinetic control.
  • To enhance circularly polarized phosphorescence (CPP) in Ag9-NC based nanofibers.

Main Methods:

  • Utilized crystallization-induced self-assembly (CISA) of water-soluble, negatively charged silver nanoclusters (Ag9-NCs) in the presence of glutamic acid.
  • Introduced a positively-charged additive, choline chloride (CC), to modulate nanowire structure and inter-nanofiber interactions.
  • Varied the timing of CC addition to alter the kinetic pathway of CISA.

Main Results:

  • Successfully formed nanofibers containing sub-1 nm nanowires exhibiting circularly polarized phosphorescence (CPP).
  • Modulation of nanowire structure and lateral interactions by CC led to improved phosphorescence and chirality.
  • Demonstrated that the timing of CC introduction effectively controlled the self-assembly kinetics and final optical output.

Conclusions:

  • Kinetic control over CISA provides an effective strategy for manipulating the self-assembly of metal nanoclusters.
  • The developed method allows for precise tuning of nanostructure morphology and optical properties, specifically CPP.
  • This work offers new avenues for designing advanced nanomaterials with tailored optical functionalities.