Anion adsorption induced reversal of coherency strain |
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Authors: | Trimble T Tang L Vasiljevic N Dimitrov N van Schilfgaarde M Friesen C Thompson C V Seel S C Floro J A Sieradzki K |
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Institution: | Ira A. Fulton School of Engineering, Arizona State University, Tempe, 85287-6106, USA. |
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Abstract: | Experimental results are presented for stress evolution, in vacuum and electrolyte, for the first monolayer of Cu on Au(111). In electrolyte the monolayer is pseudomorphic and the stress-thickness change is -0.60 N/m, while conventional epitaxy theory predicts a value of +7.76 N/m. In vacuum, the monolayer is incoherent with the underlying gold. Using a combination of first-principles based calculations and molecular dynamic simulations we analyzed these results and demonstrate that in electrolyte, overlayer coherency is maintained owing to anion adsorption. |
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