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Au–Pd barcode nanowires with tailored lattice parameters and segment lengths for catalytic applications

DOI: 10.1021/acsanm.3c05487 DOI Help

Authors: Giuseppe Abbondanza (Chalmers University of Technology) , Andrea Grespi (Lund University) , Alfred Larsson (Lund University) , Crispin Hetherington (Lund University) , Matthew Snelgrove (Diamond Light Source) , Francesco Carla (Diamond Light Source) , Nikolay Vinogradov (MAX IV Laboratory) , Roberto Felici (CNR-SPIN, Via Del Fosso del Cavaliere) , Edvin Lundgren (Lund University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Applied Nano Materials , VOL 11

State: Published (Approved)
Published: February 2024
Diamond Proposal Number(s): 30356

Open Access Open Access

Abstract: 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.

Diamond Keywords: gold; palladium; nanomaterials; multisegmented; barcode; synchrotron; X-ray diffraction; electrodeposition

Subject Areas: Materials, Chemistry, Physics

Instruments: I07-Surface & interface diffraction

Added On: 12/02/2024 08:50

Discipline Tags:

Surfaces Physics Physical Chemistry Catalysis Chemistry Materials Science interfaces and thin films Nanoscience/Nanotechnology

Technical Tags: