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2 Electron Technology

2 1998

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Scanning tunneling spectroscopy investigations of gold films deposited on the (0001) basal plane of highly oriented pyrolitic graphite

Klusek Z., Balcerski J., Olejniczak W., Kobierski P.

Electron Technology

1998

Vol. 31, No. 3/4

512-515

Gold was thermally evaporated onto (0001) basal plane of highly oriental pyrolitic graphite surface at substrate temperature ranging from 20°C to 600°C. The evaporation rate was varied in the range from 0.02nm/s to 1nm/s. Scanning tunneling microscopy/spectroscopy investigations were carried out in constant current mode under ambient air condition. Gold films exhibit an increasing grain size and grain flattening as the substrate temperature increases and evaporation rate decreases. At higher temperatures (T>300°C) and low evaporation rate (0.02 nm/s) flat terraces with dimension of order 50÷ 250 nm were formed. On the flat terraces scanning tunneling spectroscopy measurements (dI/dV)(I/V) were performed. At the unoccoupied part of the spectra characterstic feature could be distinguished at around 0.6 eV below the Fermi level. The observed feature resembles the well known surface state on the Au(111) plane which exists within the au L2 gap. This is in spite of the fact that spectra were recorded in ambient air conditions.

Modular scanning system

Klusek Z., Olejniczak W., Pawłowski S., Kobierski P.

Electron Technology

1998

Vol. 31, No. 3/4

508-511

A new, fully computerized scanning tunneling and atomic force microscope system has been designed and built. Both microscope are equipped with fully automatic system of initial approach of the probe tip to the sample. Special construction of the holders ensures an easy replacement of samples and probe tips. The system allows the operation in a wide range of scanning, starting from nanometers to microus using one scanner only (retaining the hight resolution). All functions of the microscopes are fully controlled by personal computer. Due to orginal, clear software written under Windows 3.1/Windows 95 systems on can execute each operation only with a mouse.