Size and Structure Dependence of Electronic States in Thiolate-Protected Gold Nanoclusters of Au25(SR)18, Au38(SR)24, and Au144(SR)60
The electronic states of three different sizes of compositionally precise thiolate-protected gold nanoclusters, Au25(SR)18, Au38(SR)24, and Au144(SR)60 (R = C12H25), have been evaluated by X-ray photoemission spectroscopy. The Au 4f core-levels of the nanoclusters are well reproduced by two spectral...
Gespeichert in:
Veröffentlicht in: | Journal of physical chemistry. C 2013-02, Vol.117 (7), p.3674-3679 |
---|---|
Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | The electronic states of three different sizes of compositionally precise thiolate-protected gold nanoclusters, Au25(SR)18, Au38(SR)24, and Au144(SR)60 (R = C12H25), have been evaluated by X-ray photoemission spectroscopy. The Au 4f core-levels of the nanoclusters are well reproduced by two spectral components derived from centered core-Au and positively charged shell-Au atoms, the numbers of which are determined based on the atomic structures of the nanoclusters. The spin–orbit splitting of Au 5d 5/2 and 5d 3/2 in the valence band becomes narrower than that for bulk Au, depending on the cluster size, which is quantitatively characterized by a reduction in the average coordination number of Au. The Au 5d valence-band spectra also show that the charge reorganization of 5d electrons induced by interaction with thiol molecules is more significant for the 5d 5/2 than the 5d 3/2 orbital. |
---|---|
ISSN: | 1932-7447 1932-7455 |
DOI: | 10.1021/jp400785f |