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Instruments / Technical Area	Publication Details	Published	Actions
I07-Surface & interface diffraction	Au–Pd barcode nanowires with tailored lattice parameters and segment lengths for catalytic applications Giuseppe Abbondanza , Andrea Grespi , Alfred Larsson , Crispin Hetherington , Matthew Snelgrove , Francesco Carla , Nikolay Vinogradov , Roberto Felici , Edvin Lundgren Acs Applied Nano Materials 11 DOI: 10.1021/acsanm.3c05487 Diamond Proposal Number(s): [30356] Open Access Show Abstract ▼ 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.	Feb 2024
I07-Surface & interface diffraction	Structure and strain of CdS nanofilms on Au(111) during electrochemical atomic layer deposition growth Matthew Snelgrove , A. Morris , D. O'Neill , F. Carla Applied Surface Science 20 DOI: 10.1016/j.apsusc.2023.159112 Diamond Proposal Number(s): [32333, 32300] Open Access Show Abstract ▼ Abstract: X-ray scattering is used to characterise the initial stages of the growth of CdS on Au(1 1 1) surfaces via electrochemical atomic layer deposition (E-ALD). This work characterises E-ALD films using a unique in-situ setup, allowing for X-ray reflectivity and diffraction data to be obtained to characterise the growth process of the CdS film. Structural information, as well as information concerning growth rates, roughness and strain as a function of the stage in the growth process, are obtained to provide a unique perspective of the early stages of deposition for this methodology. The results show the self-limiting, linear growth rate of CdS films that are wurtzite in structure, are highly epitaxial with the underlying Au substrate, and exhibit little to no chemical impurities during the deposition procedure.	Dec 2023

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