Measurement of surface segregation via He+ ion scattering in CuxAgyAu1-x-y composition spread thin films

IF 2.1 4区化学 Q3 CHEMISTRY, PHYSICAL

Surface Science Pub Date : 2024-12-14 DOI:10.1016/j.susc.2024.122682

Zhitao Guo , Robert A. Burnley , Andrew J. Gellman

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Abstract

Surface segregation under UHV conditions was mapped out across Cu_xAg_yAu_1-_x_-_y (x = 0→1,y = 0→1‐x) composition space and over a temperature range of 500 – 800 K. E-beam deposition of Composition Spread Alloy Films (CSAFs), high-throughput SEM-EDX, XPS and LEIS experiments were performed to study the relationship between the alloy surface composition and bulk alloy composition. Strong depletion of Cu was observed across all alloy compositions, with <1 % surface Cu detected in alloys containing >20 % bulk Ag or >60 % bulk Au. The majority of the composition space is represented by AgAu surface alloys, showing weak Ag enrichment in alloys with low bulk Cu compositions (<25 % Ag enrichment) and significant Ag enrichment in alloys with higher Cu content (∼75 % Ag enrichment). Surface enrichment of Au in Cu was only observed in alloys with <5 % bulk Ag. These observations are quantitatively consistent with prior studies of the relevant binary alloys and qualitatively consistent with surface segregation driven by differences in surface energies. Alloys with surface Cu greater than 1 % were found to have temperature dependent segregation, varying by as much as 15 % surface Cu over the temperature range 500 – 800 K, while all other alloys showed negligible differences.

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来源期刊

Surface Science 化学-物理：凝聚态物理

CiteScore

3.30

自引率

5.30%

发文量

137

审稿时长

25 days

期刊介绍： Surface Science is devoted to elucidating the fundamental aspects of chemistry and physics occurring at a wide range of surfaces and interfaces and to disseminating this knowledge fast. The journal welcomes a broad spectrum of topics, including but not limited to: • model systems (e.g. in Ultra High Vacuum) under well-controlled reactive conditions • nanoscale science and engineering, including manipulation of matter at the atomic/molecular scale and assembly phenomena • reactivity of surfaces as related to various applied areas including heterogeneous catalysis, chemistry at electrified interfaces, and semiconductors functionalization • phenomena at interfaces relevant to energy storage and conversion, and fuels production and utilization • surface reactivity for environmental protection and pollution remediation • interactions at surfaces of soft matter, including polymers and biomaterials. Both experimental and theoretical work, including modeling, is within the scope of the journal. Work published in Surface Science reaches a wide readership, from chemistry and physics to biology and materials science and engineering, providing an excellent forum for cross-fertilization of ideas and broad dissemination of scientific discoveries.