Nano Archive

Investigations of Pd clusters by the combined use of HREM, STM, high-energy spectroscopies and tunneling conductance measurements

Aiyer, Hemantkumar N. and Vijayakrishnan, V. and Subbanna, G. N. and Rao, C. N. R. (1994) Investigations of Pd clusters by the combined use of HREM, STM, high-energy spectroscopies and tunneling conductance measurements. surface science, 313 (3). pp. 392-398.

Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.

Abstract

Palladium clusters deposited on carbon substrates by vacuum evaporation have been examined by high resolution electron microscopy and scanning tunneling microscopy to obtain the size distributions of the clusters. Pd(3d) binding energy of clusters of known size distributions have been measured to establish the variation of the binding energy with the cluster size. Clusters of a mean diameter of less, approximate 1 nm which show the highest Pd(3d) binding energies relative to the bulk metal also show a conductance gap in tunneling spectroscopic measurements. The results show the occurrence of a size-dependent metal-to-nonmetal transition in Pd clusters. This conclusion is corroborated by valence band and bremsstrahlung isochromat spectroscopic measurements which show the emergence of new states closer to EF with an increase in the cluster size.

Item Type:Article
Subjects:Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:4424
Deposited By:JNCASR
Deposited On:03 Apr 2009 06:18
Last Modified:03 Apr 2009 06:18

Repository Staff Only: item control page