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Oxidation Driven Thin‐Film Solid‐State Metal Dealloying Forming Bicontinuous Nanostructures

Journal Article · · Advanced Materials Interfaces
 [1];  [1];  [1];  [2];  [2];  [2];  [3];  [4];  [4];  [5];  [6]
  1. Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook NY 11794 USA
  2. Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA
  3. Department of Joint Photon Science Institute Stony Brook University Stony Brook NY 11794 USA
  4. National Synchrotron Light Source II Brookhaven National Laboratory Upton NY 11973 USA
  5. Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook NY 11794 USA, Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA
  6. Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook NY 11794 USA, National Synchrotron Light Source II Brookhaven National Laboratory Upton NY 11973 USA
Abstract

Solid‐state metal dealloying (SSMD) is a promising method for fabricating nanoscale metallic composites and nanoporous metals across a range of materials. Thin‐film SSMD is particularly attractive due to its ability to create fine features via solid‐state interfacial reactions within a thin‐film geometry, which can be integrated into devices for various applications. This work examines a new dealloying couple, namely the Nb–Al alloy with the dealloying agent Sc, as previously predicted in the machine‐learning (ML) models. Prior ML predictions aimed to guide the design of nanoarchitectured materials through dealloying, relying on intuition‐driven discovery within a large parameter space. However, this work reveals that at the nanoscale, the involvement of oxygen in thin film processing may instead drive the dealloying process, resulting in the formation of bicontinuous nanostructures similar to those formed by metal‐agent dealloying. The phase evolution, as well as chemical and morphological changes, are closely analyzed using a combination of X‐ray absorption spectroscopy, diffraction, and scanning transmission electron microscopy to understand the mechanisms behind nanostructure formation. The findings suggest a potential pathway for utilizing oxygen to drive the formation of bicontinuous metal–metal oxide nanocomposites, paving the way for further development of functional nanoporous materials in diverse fields.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
SC0012704
OSTI ID:
2001145
Alternate ID(s):
OSTI ID: 2001146
OSTI ID: 2203270
Report Number(s):
BNL--224926-2023-JAAM; 2300454
Journal Information:
Advanced Materials Interfaces, Journal Name: Advanced Materials Interfaces Journal Issue: 35 Vol. 10; ISSN 2196-7350
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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