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Unusual fcc-structured Ag10 kernels trapped in Ag70 nanoclusters
Yan-Min Su1, Zhi Wang1, Gui-Lin Zhuang2
1Key Lab for Colloid and Interface Chemistry of Education Ministry , School of Chemistry and Chemical Engineering , Shandong University , Jinan , 250100 , People's Republic of China .
Chemical Science
|February 5, 2019
Summary
Researchers developed novel silver nanoclusters, Ag10@Ag70, featuring a unique Ag10 core. This breakthrough advances understanding of atomic-level silver nanoparticle growth and self-assembly.
Area of Science:
- Nanotechnology
- Materials Science
- Inorganic Chemistry
Background:
- Controlled synthesis of atom-precise silver nanoparticles within larger silver nanoclusters remains a significant challenge.
- Limited progress has been made in precisely trapping ultrasmall silver nanoparticles into silver nanoclusters.
Purpose of the Study:
- To isolate and characterize novel silver nanoclusters with a unique core structure.
- To investigate the self-assembly process of complex three-shell nanoclusters involving silver and polyoxometalate anions.
Main Methods:
- Synthesis and isolation of two novel silver nanoclusters, designated SD/Ag80a and SD/Ag80b.
- Structural characterization of the three-shell nanocluster architecture: Ag10@(Mo7O26)2@Ag70.
- Investigation of the optical properties, specifically near-infrared emission.
Main Results:
- Discovery of two new silver nanoclusters, Ag10@Ag70 (SD/Ag80a and SD/Ag80b), containing a novel fcc-structured Ag10 kernel.
- The Ag10 kernel, formed from two Ag6 octahedra, is unprecedented in silver nanoclusters and represents a new embryo state.
- SD/Ag80a exhibits near-infrared emission at 730 nm at low temperatures.
Conclusions:
- This work provides new insights into the atomic-level growth mechanisms of silver nanoparticles.
- Demonstrates a complex three-shell self-assembly process involving polyoxometalate (POM) and distinct silver nanocluster components.
- The novel Ag10 kernel structure opens new avenues for designing advanced nanomaterials.
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