Print Email Facebook Twitter Thermal atomic layer deposition of gold nanoparticles Title Thermal atomic layer deposition of gold nanoparticles: Controlled growth and size selection for photocatalysis Author Minaye Hashemi, F.S. (TU Delft ChemE/Product and Process Engineering) Grillo, F. (TU Delft ChemE/Product and Process Engineering; ETH Zürich) Ravikumar, Vikram R. (Student TU Delft) Benz, D. (TU Delft ChemE/Product and Process Engineering) Shekhar, Ankit (Student TU Delft) Griffiths, Matthew B.E. (Carleton University) Barry, Seán T. (Carleton University) van Ommen, J.R. (TU Delft ChemE/Product and Process Engineering) Date 2020 Abstract Gold nanoparticles have been extensively studied for their applications in catalysis. For Au nanoparticles to be catalytically active, controlling the particle size is crucial. Here we present a low temperature (105 °C) thermal atomic layer deposition approach for depositing gold nanoparticles on TiO2 with controlled size and loading using trimethylphosphino-trimethylgold(iii) and two co-reactants (ozone and water) in a fluidized bed reactor. We show that the exposure time of the precursors is a variable that can be used to decouple the Au particle size from the loading. Longer exposures of ozone narrow the particle size distribution, while longer exposures of water broaden it. By studying the photocatalytic activity of Au/TiO2 nanocomposites, we show how the ability to control particle size and loading independently can be used not only to enhance performance but also to investigate structure-property relationships. This study provides insights into the mechanism underlying the formation and evolution of Au nanoparticles prepared for the first time via vapor phase atomic layer deposition. Employing a vapor deposition technique for the synthesis of Au/TiO2 nanocomposites eliminates the shortcomings of conventional liquid-based processes opening up the possibility of highly controlled synthesis of materials at large scale. To reference this document use: http://resolver.tudelft.nl/uuid:95b331e8-7c4c-4fd7-9c79-56ae015171a6 DOI https://doi.org/10.1039/d0nr01092h ISSN 2040-3364 Source Nanoscale, 12 (16), 9005-9013 Part of collection Institutional Repository Document type journal article Rights © 2020 F.S. Minaye Hashemi, F. Grillo, Vikram R. Ravikumar, D. Benz, Ankit Shekhar, Matthew B.E. Griffiths, Seán T. Barry, J.R. van Ommen Files PDF d0nr01092h.pdf 2.91 MB Close viewer /islandora/object/uuid:95b331e8-7c4c-4fd7-9c79-56ae015171a6/datastream/OBJ/view