Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Subnanometric metallic clusters are getting considerable attention recently due to their properties, which are very different from the bulk or nanoparticle ones, offering exciting possibilities for their use in novel materials or devices and in different fields like medicine, magnetism or catalysis [1]. A subnanometric cluster is a metallic molecule having between 2 and ≈ 100 atoms with a fixed geometry and, due to its reduced size, a bandgap (larger as the cluster is smaller), which appears at the Fermi level of the metal, granting the cluster with an electronic structure that will determine the appearance of completely new properties strictly depending on cluster size. Moreover, changes in one or two atoms will affect the bandgap thus changing completely their properties [2,3]. Therefore, it is clear the importance of designing effective synthesis methods trying to produce monodisperse cluster samples. Here, we report the synthesis of highly fluorescent Cu clusters protected with cysteine. Clusters were characterized by UV-Vis spectroscopy, Fluorescence Spectroscopy, AFM, XPS and Mass Spectrometry. The developed synthesis opens up different possibilities for their application in different fields (due to the small bandgap and the low energy position of the HOMO), like visible photocatalysis.
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