Nanofluidic Trapping of Faceted Colloidal Nanocrystals for Parallel Single-Particle Catalysis
| Autor: | Sune Levin, Sarah Lerch, Astrid Boje, Joachim Fritzsche, Sriram KK, Henrik Ström, Kasper Moth-Poulsen, Henrik Sundén, Anders Hellman, Fredrik Westerlund, Christoph Langhammer |
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| Přispěvatelé: | Knut and Alice Wallenberg Foundation, Swedish Foundation for Strategic Research, Swedish Research Council, Ministerio de Ciencia, Innovación y Universidades (España), Levin, Sune, Lerch, Sarah, Boje, Astrid, Ström, Henrik, Moth-Poulsen, Kasper, Sundén, Henrik, Hellman, Anders, Westerlund, Fredrik, Langhammer, Christoph |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | ACS nano. 16(9) |
| ISSN: | 1936-086X |
| Popis: | Catalyst activity can depend distinctly on nanoparticle size and shape. Therefore, understanding the structure sensitivity of catalytic reactions is of fundamental and technical importance. Experiments with single-particle resolution, where ensemble-averaging is eliminated, are required to study it. Here, we implement the selective trapping of individual spherical, cubic, and octahedral colloidal Au nanocrystals in 100 parallel nanofluidic channels to determine their activity for fluorescein reduction by sodium borohydride using fluorescence microscopy. As the main result, we identify distinct structure sensitivity of the rate-limiting borohydride oxidation step originating from different edge site abundance on the three particle types, as confirmed by first-principles calculations. This advertises nanofluidic reactors for the study of structure-function correlations in catalysis and identifies nanoparticle shape as a key factor in borohydride-mediated catalytic reactions. This work was supported by the Knut and Alice Wallenberg Foundation project 2015.0055, the Swedish Foundation for Strategic Research project RMA15-0052, and the Swedish Research Council project 2018-00329. With funding from the Spanish government through the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000917-S). |
| Databáze: | OpenAIRE |
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