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Thermally Hypsochromic or Bathochromic Emissions? The Silver Nuclei Does Matter
Yan-Min Su1, Zhao-Zhen Cao1, Lei Feng1
1Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan, 250100, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|November 24, 2021
Summary
Synthesizing core-shell silver nanoclusters with modulated cores is challenging. Researchers developed new silver nanoclusters (SD/Ag45b and SD/Ag51a) with distinct cores and similar shells, revealing structure-luminescence correlations.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Nanotechnology
Background:
- Core-shell silver nanoclusters are crucial in various applications.
- Controlling internal structure during synthesis remains a significant challenge.
- Understanding structure-property relationships, especially luminescence thermochromism, is vital.
Purpose of the Study:
- To synthesize and characterize novel core-shell silver nanoclusters with structurally distinct cores.
- To investigate the influence of sulfonic acids on nanocluster formation and structure.
- To explore the correlation between the internal core structure and luminescence thermochromic behavior.
Main Methods:
- Isolation and characterization of silver nanoclusters using electrospray ionization mass spectrometry (ESI-MS).
- Structural analysis of core-shell nanoclusters, including the Ag42 shell and Ag3S9 or Ag9S9 cores.
- Investigation of luminescence thermochromism in the near-infrared (NIR) region.
Main Results:
- Two distinct core-shell silver nanoclusters, [Ag3S9@Ag42] (SD/Ag45b) and [Ag9S9@Ag42] (SD/Ag51a), were successfully synthesized.
- The nanoclusters feature a consistent Ag42 shell but differ in their internal Ag3S9 and Ag9S9 cores.
- p-Toluenesulfonic acid was shown to induce structural transformation from SD/Ag45b to Ag51.
- SD/Ag45b and SD/Ag51a exhibited inverse luminescence thermochromic behaviors, linked to their core structures.
Conclusions:
- This study demonstrates successful synthesis of silver nanoclusters via core modulation.
- The findings provide a molecular-level understanding of the relationship between core structure and luminescence thermochromism.
- The work offers a new prototype for designing functional silver nanoclusters.
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