STM/STS investigations of titanium oxide nanostructures on au substrate |
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Authors: | Szymon Winiarz |
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Affiliation: | Institute of Physics, Poznan University of Technology, Nieszawska 13A, 60-965 Poznań, Poland |
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Abstract: | Au substrate was prepared by Au evaporation on Si(111) surface. Au surface was composed of Au grains with typical diameter of about 50 nm with atomically flat terraces. TiO2 nanostructures were created by electron gun evaporation of Ti while simultaneous dosing of high purity O2 gas. The pressure of oxygen was kept at 5 · 10− 8 mbar and controlled by means of residual gas analyzer (RGA). Scanning tunneling microscopy (STM) images showed that TiO2 nanocrystallites had grown between Au grains in cavities between them. This may suggest that such spots are preferred TiO2 nucleation sites. I-V curves measured above Au showed metallic properties while those measured above TiO2 exhibit energy gap characteristics for semiconducting material. |
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Keywords: | Scanning tunneling microscopy Scanning tunneling spectroscopy Growth Titanium oxide Clusters |
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