Tuning the surface composition of Cu3Au binary alloy

Li, Chaoran; Liu, Qianqian; Boscoboinik, Jorge Anibal; Zhou, Guangwen

doi:10.1039/C9CP05729C

Title: Tuning the surface composition of Cu₃Au binary alloy

Journal Article · 20 January 2020 · Physical Chemistry Chemical Physics. PCCP

DOI: https://doi.org/10.1039/C9CP05729C · OSTI ID:1593956

Li, Chaoran ^[1]; Liu, Qianqian ^[2]; Boscoboinik, Jorge Anibal ^[3];

^[2]

State Univ. of New York, Binghamton, NY (United States); Binghamton University
State Univ. of New York, Binghamton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Using ambient-pressure X-ray photoelectron spectroscopy, here we report the real-time monitoring of dynamic surface composition evolution of Cu₃Au(100) in response to the imposed environmental stimuli. Segregation of Au to the pristine surface under ultrahigh vacuum annealing leads to the phase separation with pure Au at the surface and alloyed Au in the subsurface. Upon switching to an oxidizing atmosphere, oxygen adsorption drives the surface segregation of Cu along with inward migration of pure Au to the subsurface. Switching to a H₂ atmosphere results in oxygen loss from the oxygenated surface, thereby promoting Au surface segregation and reverting the surface to the pristine state with the Au termination. Finally, these measurements demonstrated the tunability of the surface composition of the binary alloy by utilizing the interplay between the tendency of segregating a more noble constituent to the surface and the tendency to segregate the more reactive one with the chemical stimuli.

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Research Organization:: Binghamton Univ., NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001135; SC0012704

OSTI ID:: 1593956

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 6 Vol. 22; ISSN 1463-9076; ISSN PPCPFQ

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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