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Title: Tuning the surface composition of Cu 3Au binary alloy

Abstract

Using ambient-pressure X-ray photoelectron spectroscopy, here we report the real-time monitoring of dynamic surface composition evolution of Cu 3Au(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 H 2 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.

Authors:
 [1];  [1];  [2]; ORCiD logo [1]
  1. State Univ. of New York, Binghamton, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Binghamton Univ., NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1593956
Alternate Identifier(s):
OSTI ID: 1594207
Grant/Contract Number:  
SC0001135; SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Chemistry Chemical Physics. PCCP (Print)
Additional Journal Information:
Journal Name: Physical Chemistry Chemical Physics. PCCP (Print); Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Li, Chaoran, Liu, Qianqian, Boscoboinik, Jorge Anibal, and Zhou, Guangwen. Tuning the surface composition of Cu3Au binary alloy. United States: N. p., 2020. Web. doi:10.1039/C9CP05729C.
Li, Chaoran, Liu, Qianqian, Boscoboinik, Jorge Anibal, & Zhou, Guangwen. Tuning the surface composition of Cu3Au binary alloy. United States. doi:10.1039/C9CP05729C.
Li, Chaoran, Liu, Qianqian, Boscoboinik, Jorge Anibal, and Zhou, Guangwen. Mon . "Tuning the surface composition of Cu3Au binary alloy". United States. doi:10.1039/C9CP05729C.
@article{osti_1593956,
title = {Tuning the surface composition of Cu3Au binary alloy},
author = {Li, Chaoran and Liu, Qianqian and Boscoboinik, Jorge Anibal and Zhou, Guangwen},
abstractNote = {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.},
doi = {10.1039/C9CP05729C},
journal = {Physical Chemistry Chemical Physics. PCCP (Print)},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {1}
}

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