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Alfred Larsson. Portrait.

Alfred Larsson

Postdoctoral fellow

Alfred Larsson. Portrait.

Au-Pd Barcode Nanowires with Tailored Lattice Parameters and Segment Lengths for Catalytic Applications

Author

  • Giuseppe Abbondanza
  • Andrea Grespi
  • Alfred Larsson
  • Crispin Hetherington
  • Matthew Snelgrove
  • Francesco Carlá
  • Nikolay Vinogradov
  • Roberto Felici
  • Edvin Lundgren

Summary, in English

In this study, we present a systematic investigation of the controlled fabrication of Au-Pd barcode nanowires within nanoporous anodic aluminum oxide (NP-AAO) templates. By using a combination of in situ X-ray diffraction (XRD), focused ion beam scanning electron microscopy (FIB-SEM), and transmission electron microscopy (TEM), we elucidate the influence of template preparation methods on the resulting nanowire properties. The template treatment, involving either pore widening or barrier layer thinning, significantly impacts nanowire growth. Through the analysis of the XRD data, we observe sequential deposition of Au and Pd segments with lattice parameter variations and strain effects. Particularly, the lattice parameters of Au and Pd segments display intricate temporal dependencies, influenced by interfacial effects and strain caused by growth under confinement. FIB-SEM imaging reveals uniform and reproducible nanowire lengths in the template treated with pore widening. Furthermore, TEM analysis confirms the presence of distinct Au and Pd segments, while scanning TEM-energy-dispersive X-ray spectroscopy revealed minor evidence of interdiffusion between the first and the second electrodeposited segments. Our findings emphasize the potential of the electrodeposition process within nanoporous templates for producing barcode nanowires with precise segmental properties. The combination of in situ XRD and electron microscopy offers valuable insights into the growth dynamics and structural characteristics of the fabricated Au-Pd barcode nanowires. This controlled fabrication strategy opens doors to tailoring nanowire properties for diverse applications, particularly in catalysis.

Department/s

  • Synchrotron Radiation Research
  • LU Profile Area: Light and Materials
  • NanoLund: Centre for Nanoscience
  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • Centre for Analysis and Synthesis
  • MAX IV, STM
  • LTH Profile Area: Photon Science and Technology

Publishing year

2024-02

Language

English

Pages

3861-3872

Publication/Series

ACS Applied Nano Materials

Volume

7

Issue

4

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Condensed Matter Physics (including Material Physics, Nano Physics)

Keywords

  • barcode
  • electrodeposition
  • gold
  • multisegmented
  • nanomaterials
  • palladium
  • synchrotron
  • X-ray diffraction

Status

Published

ISBN/ISSN/Other

  • ISSN: 2574-0970