Atomic Layer Deposited Conformal Ceramic Coatings for Anti-Corrosion of Ag Nanoparticles
The goal of this work is to explore atomic layer deposition (ALD) as a thin film coating technique to inhibit corrosion of metal nanoparticles, given the technique's ability to form a conformal coating on high aspect ratio substrates. Various coating materials, including Al2O3, ZrO2, HfO2, and TiO2 of different thicknesses were coated on Ag nanoparticles (NPs) in a fluidized bed ALD reactor. To avoid sintering of Ag NPs during the ALD process, the reaction temperature was set to 100 °C, lower than typical ALD reaction temperatures for these metal oxides. The ultrathin coatings (up to ~10 nm thick) were conformally deposited on the surface of Ag NPs. During the corrosion tests in a neutral 3.5 wt% NaCl solution, the corrosion current density was lowered by more than one order of magnitude; in an acid 0.5 M H2SO4 solution, the stabilities of different thin coatings were compared. Ultraviolet–visible spectra of coated Ag NPs showed retention of surface plasmonic resonance.
Y. Gao et al., "Atomic Layer Deposited Conformal Ceramic Coatings for Anti-Corrosion of Ag Nanoparticles," Applied Surface Science, vol. 532, Elsevier, Dec 2020.
The definitive version is available at https://doi.org/10.1016/j.apsusc.2020.147374
Chemical and Biochemical Engineering
Keywords and Phrases
Ag nanoparticles; Atomic layer deposition; Corrosion; Thin films
International Standard Serial Number (ISSN)
Article - Journal
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01 Dec 2020