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Coarsening-resistant Ag nanoparticles stabilized on amorphous TiOx nanoparticles

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Abstract

Bare Ag nanoparticles (∼10 nm) and Ag nanoparticles (1–20 nm) on the surfaces of larger TiOx nanoparticles were prepared by laser ablation of microparticle aerosols (LAMA). The behaviors of the nanoparticles during high temperature annealing were then studied with ex situ and in situ transmission electron microscopy. For the ex situ heating experiments, Ag and Ag-on-TiOx NPs were collected onto gold TEM grids and subjected to annealing treatments at 500 °C in argon, vacuum, and air. At this temperature, bare Ag NPs on carbon TEM supports coarsened rapidly in both air and argon atmospheres. In contrast, Ag-on-TiOx NPs that were heated to 500 °C in flowing argon or in a vacuum did not coarsen significantly and were remarkably stable. Ag-on-TiOx NPs that were heated to 500 °C in air, however, behaved quite differently. The TiOx crystallized upon heating and a significant loss of Ag were observed from the surfaces of the TiOx, likely due to sublimation. These results demonstrate that the surface defect structure and chemistry of the oxide support strongly influence the thermal stability of Ag NPs produced by LAMA.

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Acknowledgements

We are also grateful for the assistance we received from Dr. Karalee Jarvis with the in situ TEM heating experiments.

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Authors and Affiliations

  1. Materials Science and Engineering Program, The University of Texas at Austin, Austin, TX, 78712, USA

    Michael Gammage, Michael F. Becker, John W. Keto & Desiderio Kovar

  2. Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA

    Hugo Celio

  3. Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX, 78712, USA

    Michael F. Becker

  4. Department of Physics, The University of Texas at Austin, Austin, TX, 78712, USA

    John W. Keto

  5. Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX, 78712, USA

    Desiderio Kovar

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  1. Michael Gammage
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  2. Hugo Celio
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  3. Michael F. Becker
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  4. John W. Keto
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  5. Desiderio Kovar
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Correspondence to Michael Gammage.

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Funding

This study was funded by the National Science Foundation under Grant Nos. CMMI 1435949 and CBET 0708779.

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The authors declare that they have no conflict of interest.

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Gammage, M., Celio, H., Becker, M.F. et al. Coarsening-resistant Ag nanoparticles stabilized on amorphous TiOx nanoparticles. J Nanopart Res 19, 276 (2017). https://doi.org/10.1007/s11051-017-3981-9

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  • DOI: https://doi.org/10.1007/s11051-017-3981-9

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