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Role of Substrate in Au Nanoparticle Decoration by Electroless Deposition

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Dipartimento di Fisica e Astronomia “Ettore Majorana”, Università di Catania, and IMM-CNR, via S. Sofia 64, 95123 Catania, Italy
2
Department of Physical Electronics, School of Electrical Engineering and Department of Materials Science and Engineering, Faculty of Engineering, Tel Aviv University, Tel-Aviv 69978, Israel
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(11), 2180; https://doi.org/10.3390/nano10112180
Received: 24 September 2020 / Revised: 29 October 2020 / Accepted: 29 October 2020 / Published: 1 November 2020
(This article belongs to the Section Synthesis, Interfaces and Nanostructures)
Decoration of nanostructures is a promising way of improving performances of nanomaterials. In particular, decoration with Au nanoparticles is considerably efficient in sensing and catalysis applications. Here, the mechanism of decoration with Au nanoparticles by means of low-cost electroless deposition (ELD) is investigated on different substrates, demonstrating largely different outcomes. ELD solution with Au potassium cyanide and sodium hypophosphite, at constant temperature (80 °C) and pH (7.5), is used to decorate by immersion metal (Ni) or semiconductor (Si, NiO) substrates, as well as NiO nanowalls. All substrates were pre-treated with a hydrazine hydrate bath. Scanning electron microscopy and Rutherford backscattering spectrometry were used to quantitatively analyze the amount, shape and size of deposited Au. Au nanoparticle decoration by ELD is greatly affected by the substrates, leading to a fast film deposition onto metallic substrate, or to a slow cluster (50–200 nm sized) formation on semiconducting substrate. Size and density of resulting Au clusters strongly depend on substrate material and morphology. Au ELD is shown to proceed through a galvanic displacement on Ni substrate, and it can be modeled with a local cell mechanism widely affected by the substrate conductivity at surface. These data are presented and discussed, allowing for cheap and reproducible Au nanoparticle decoration on several substrates. View Full-Text
Keywords: gold electroless deposition; nickel oxide nanostructures; decoration; nucleation model; growth; substrate effect gold electroless deposition; nickel oxide nanostructures; decoration; nucleation model; growth; substrate effect
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MDPI and ACS Style

Bruno, L.; Urso, M.; Shacham-Diamand, Y.; Priolo, F.; Mirabella, S. Role of Substrate in Au Nanoparticle Decoration by Electroless Deposition. Nanomaterials 2020, 10, 2180. https://doi.org/10.3390/nano10112180

AMA Style

Bruno L, Urso M, Shacham-Diamand Y, Priolo F, Mirabella S. Role of Substrate in Au Nanoparticle Decoration by Electroless Deposition. Nanomaterials. 2020; 10(11):2180. https://doi.org/10.3390/nano10112180

Chicago/Turabian Style

Bruno, Luca, Mario Urso, Yosi Shacham-Diamand, Francesco Priolo, and Salvo Mirabella. 2020. "Role of Substrate in Au Nanoparticle Decoration by Electroless Deposition" Nanomaterials 10, no. 11: 2180. https://doi.org/10.3390/nano10112180

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