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期刊论文
Analysis of electric field-induced fabrication on Au and Ti with an STM in air
Applied Surface Science 187(2002)173-178,-0001,():
Studieds of the modification mechanism of Au and Ti surfaces by electric fields applied with a scanning sunneling microscope (STM) are carried out at atmospheric pressure and room temperatute. For pulses of 1-100μs, nanodots can only be formed on Ti under conditions where the current shows substantial fluctuation, indicating tip-sample contace. If the field is applied gradually, Au is not affected and pits are formed on Ti. We interpert pit formation as a result of fiele-induced oxidation. Moreover, experiments show that the relative humidity plays an important part in nanostructure formation on Ti. Our results can be explained through a combination of direct contact and oxidation inducedby electricf field.
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