Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Metal atomic quantum clusters (AQCs), formed by a small number of metal (0) atoms (N= number of atoms < 100-200 atoms, with sizes below ≈ 1-2 nm) represent a novel state of matter, located between the nanoparticles and the single atoms. Due to quantum size effects, present new and fascinating properties like fluorescence, magnetism, circular dichroism, etc. [1]. AQCs can be considered as a completely new type of atomic level semiconductors (SCs) due to the appearance of a band gap at the Fermi level. This bandgap can be tunable in both, size and position, by changing the cluster size and the metal, allowing the design a desired electronic structure for a particular application. This talk will be focus in some new catalytic and photocatalytic properties of AQCs, like thiol oxidations [2], hydrogen photoproduction [3] or water decontamination [4]. Moreover, the characteristics of AQCs as new catalysts and their possible challenging role to solve common problems in those fields will be discussed. For the time being, there are two big groups of catalysts, namely: soluble transition metal complexes, like e.g. Ru-bipy, with high activity, good tunabilities, but low stability. On the other hand, there are solid SCs, as bulk or colloidal materials, which are usually very stable, but difficult to tune and not very active. AQCs seem to combine the advantages of both non-overlapping worlds, solid and molecular catalysts. They are very stable, good tuneable and as active as complexes, because of the accessibility of all atoms.
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