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In Situ Observation of Nanoparticle Exsolution from Perovskite Oxides: From Atomic Scale Mechanistic Insight to Nanostructure Tailoring

Lookup NU author(s): Dr Dragos Neagu, Dr Chenyang Tang, Dr Kelly Kousi, Professor Ian Metcalfe



This is the authors' accepted manuscript of an article that has been published in its final definitive form by American Chemical Society, 2019.

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Copyright © 2019 American Chemical Society.Understanding and controlling the formation of nanoparticles at the surface of functional oxide supports is critical for tuning activity and stability for catalytic and energy conversion applications. Here, we use a latest generation environmental transmission electron microscope to follow the exsolution of individual nanoparticles at the surface of perovskite oxides, with ultrahigh spatial and temporal resolution. Qualitative and quantitative analysis of the data reveals the atomic scale processes that underpin the formation of the socketed, strain-inducing interface that confers exsolved particles their exceptional stability and reactivity. This insight also enabled us to discover that the shape of exsolved particles can be controlled by changing the atmosphere in which exsolution is carried out, and additionally, this could also produce intriguing heterostructures consisting of metal-metal oxide coupled nanoparticles. Our results not only provide insight into the in situ formation of nanoparticles but also demonstrate the tailoring of nanostructures and nanointerfaces. ©

Publication metadata

Author(s): Neagu D, Kyriakou V, Roiban I-L, Aouine M, Tang C, Caravaca A, Kousi K, Schreur-Piet I, Metcalfe IS, Vernoux P, Van De Sanden MCM, Tsampas MN

Publication type: Article

Publication status: Published

Journal: ACS Nano

Year: 2019

Volume: 13

Issue: 11

Pages: 12996-13005

Online publication date: 21/10/2019

Acceptance date: 21/10/2019

Date deposited: 16/12/2019

ISSN (print): 1936-0851

ISSN (electronic): 1936-086X

Publisher: American Chemical Society


DOI: 10.1021/acsnano.9b05652


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