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Instruments / Technical Area	Publication Details	Published	Actions
I07-Surface & interface diffraction	Templated electrodeposition as a scalable and surfactant-free approach to the synthesis of Au nanoparticles with tunable aspect ratios Giuseppe Abbondanza , Alfred Larsson , Weronica Linpe , Crispin Hetherington , Francesco Carla , Edvin Lundgren , Gary S. Harlow Nanoscale Advances 2 DOI: 10.1039/D2NA00188H Diamond Proposal Number(s): [21922] Open Access Show Abstract ▼ Abstract: A high-throughput method for the fabrication of ordered arrays of Au nanoparticles is presented. It is based on pulsed electrodeposition into porous anodic alumina templates. In contrast to many synthesis routes, it is cyanide-free, prior separation of the alumina template from the aluminium substrate is not required, and the use of contaminating surfactants/capping agents often found in colloidal synthesis is avoided. The aspect ratio of the nanoparticles can also be tuned by selecting an appropriate electrodeposition time. We show how to fabricate arrays of nanoparticles, both with branched bases and with hemispherical bases. Furthermore, we compare the different morphologies produced with electron microscopies and grazing-incidence synchrotron X-ray diffraction. We find the nanoparticles are polycrystalline in nature and are compressively strained perpendicular to the direction of growth, and expansively strained along the direction of growth. We discuss how this can produce dislocations and twinning defects that could be beneficial for catalysis.	May 2022
I07-Surface & interface diffraction	Electrochemical fabrication and characterization of palladium nanowires in nanoporous alumina templates Alfred Larsson , Giuseppe Abbondanza , Weronica Linpe , Francesco Carla , Philip Mousley , Crispin Hetherington , Edvin Lundgren , Gary Harlow Journal Of The Electrochemical Society DOI: 10.1149/1945-7111/abb37e Diamond Proposal Number(s): [21922] Open Access Show Abstract ▼ Abstract: A method for the electrochemical synthesis of palladium nanowires, using porous alumina templates with diameters of 25 nm and 40 nm, is presented. Through an electrochemical barrier layer thinning step, pulsed electrodeposition can take place directly into the anodized aluminum; without need for extra removal, pore opening, and metal contact coating steps. A digital oscilloscope is used to record and integrate the current, allowing the efficiency of the electrodeposition to be calculated. We discuss how using a large 'off period' allows for the replenishment of the depleted diffusion layer. The nanowires are characterized by using a focused ion beam (FIB) to create cross-sections which can be accessed with a scanning electron microscope (SEM). With grazing-incidence X-ray diffraction (GI-XRD) we find that the nanowires have a slight compressive strain in the direction that they are confined by the pores (0.58 % and 0.51 % for the 25 nm and 40 nm pores respectively). Knowing the strain state of the nanowires inside the template is of importance for the use of templated nanowires in devices. Further characterization is made using high-resolution transmission electron microscopy (HR-TEM) and energy dispersive X-ray spectroscopy (EDS), after removal from the alumina templates.	Aug 2020

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