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• W3103390932 abstract "We report on transient adhesion and conductance phenomena associated with tip wetting in mechanical contacts produced by the indentation of a clean W(111) tip into a Au(111) surface. A combination of atomic force microscopy and scanning tunneling microscopy was used to carry out indentation and to image residual impressions in ultra-high vacuum. The ~7 nm radii tips used in these experiments were prepared and characterized by field ion microscopy in the same instrument. The very first indentations of the tungsten tips show larger conductance and pull-off adhesive forces than subsequent indentations. After ~30 indentations to a depth of ~1.7 nm, the maximum conductance and adhesion forces reach steady-state values approximately 12x and 6x smaller than their initial value. Indentation of W(111) tips into Cu(100) was also performed to investigate the universality of tip wetting phenomena with a different substrate. We propose a model from contact mechanics considerations which quantitatively reproduces the observed decay rate of the conductance and adhesion drops with a 1/e decay constant of 9-14 indentation cycles. The results show that the surface composition of an indenting tip plays an important role in defining the mechanical and electrical properties of indentation contacts." @default.
• W3103390932 created "2020-11-23" @default.
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• W3103390932 date "2013-10-31" @default.
• W3103390932 modified "2023-09-24" @default.
• W3103390932 title "Transient adhesion and conductance phenomena in initial nanoscale mechanical contacts between dissimilar metals" @default.
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• W3103390932 doi "https://doi.org/10.1088/0957-4484/24/47/475704" @default.
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