Superatom-in-Superatom Nanoclusters: Synthesis, Structure, and Photoluminescence

Area of Science:

• Materials Science
• Nanotechnology
• Inorganic Chemistry

Background:

• Silver nanoclusters (Ag25) are known for their unique properties.
• Doping nanoclusters can modify their optical and electronic characteristics.
• Introducing open d-shell metals into nanoclusters presents synthetic challenges.

Purpose of the Study:

• To develop a new method for doping Ag25 nanoclusters with open d-shell metals (Ru, Os, Ir).
• To investigate the formation of novel superatom-in-superatom nanocluster structures.
• To explore the impact of doping on the photoluminescence (PL) properties of Ag25 nanoclusters.

Main Methods:

• Synthesis of thiolate-protected Ag25 nanoclusters.
• Doping with group 8 (Ru, Os) and group 9 (Ir) metals to form metal hydride superatoms.
• Structural characterization using experimental and theoretical methods.
• Photoluminescence (PL) spectroscopy and lifetime studies.

Main Results:

• Successful co-doping of Ag25 nanoclusters with open d-shell metals and hydride species, forming superatom-in-superatom structures.
• Demonstration of a novel superatom doping phenomenon for open d-shell metals.
• Observed dopant-dependent photoluminescence (PL) properties in the synthesized nanoclusters.
• PL properties correlated with metal dopant's electron affinity (radiative processes) and kernel structure changes (nonradiative processes).

Conclusions:

• A new strategy for creating doped nanoclusters with unique superatom-in-superatom architectures has been established.
• The photoluminescence behavior of these doped nanoclusters is highly dependent on the specific metal dopant and hydride species.
• This work opens avenues for designing advanced nanomaterials with tailored optical functionalities.