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Two Hybrid Nanoclusters of Noble-metal and Titanium Oxide Display Structure Dependent Optical Limiting Effects


TiO2 has been widely used as supports of noble-metal nanoparticles (e.g. Au, Ag, Pt) with important photo or catalytic applications. Thus the introduction of noble-metal to titanium-oxo clusters with direct Mx-TimOn interactions can act the real molecular models to understand the strong metal-support interactions.However, the molecular combination of noble-metal and semiconductive nanoclusters remains a challenge.

Recently, Prof. ZHANG Jian’s group at Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, has successfully obtained the first two hybrid nanoclusters of noble-metal and titanium oxide, which display structure dependent optical limiting effects. The study was published in Angew. Chem. Int. Ed. . 

In the two clusters, the octahedral Ag6 core with strong Ag-Ag interactions has been encapsulated by Ti16-oxo shell through direct Ag-O-Ti coordination interactions. The hybrid cluster core is further stabilized by benzoate ligands, forming a triple core–shell construction of Ag6@Ti16@(benzoate)26.

The relative configuration of the Ag6 core inside the Ti-O cavity presents about 45o rotation in the two clusters, which further influences their optical limiting effects.

Moreover, the transmittance reduction effect exhibits nearly linear dependence on concentration, and the transmittance at 532 nm laser can be reduced to a minimum of 57%, making these hybrid clusters potential candidates for the fabrication of future optical limiting devices.

The study presented a breakthrough in the construction of hybrid noble-metal/Ti-O nanoclusters.

Noble-metal and semiconductive nanoclusters with atomically precise structures have great potential for their structural and reactive models.



Illustration of the Ag6@Ti16-Oxo core-shell nanostructure(Image by Prof. ZHANG’s group)



Prof. ZHANG Jian

Fujian Institute of Research on the Structure of Matter

Chinese Academy of Sciences









Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences
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