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Templated electrodeposition as a scalable and surfactant-free approach to the synthesis of Au nanoparticles with tunable aspect ratios

DOI: 10.1039/D2NA00188H DOI Help

Authors: Giuseppe Abbondanza (Lund University) , Alfred Larsson (Lund University) , Weronica Linpe (Lund University) , Crispin Hetherington (Lund University) , Francesco Carla (Diamond Light Source) , Edvin Lundgren (Lund University) , Gary S. Harlow (Malmö University; MAX IV Laboratory, Lund University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nanoscale Advances , VOL 2

State: Published (Approved)
Published: May 2022
Diamond Proposal Number(s): 21922

Open Access Open Access

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.

Subject Areas: Chemistry, Physics, Materials

Instruments: I07-Surface & interface diffraction

Added On: 25/05/2022 09:56


Discipline Tags:

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

Technical Tags:

Diffraction Grazing Incidence X-ray Diffraction (GIXD)