Photomechanical Laser Fragmentation of IrO2 Microparticles for the Synthesis of Active and Redox‐Sensitive Colloidal Nanoclusters

Author:

Spellauge Maximilian12ORCID,Tack Meike1,Streubel René1,Miertz Matthias1,Exner Kai Steffen345,Reichenberger Sven1,Barcikowski Stephan1ORCID,Huber Heinz Paul2,Ziefuss Anna Rosa1

Affiliation:

1. Technical Chemistry I and Center for Nanointegration Duisburg‐Essen (CENIDE) University of Duisburg‐Essen Universitätsstraße 7 45141 Essen Germany

2. Department of Applied Sciences and Mechatronics Munich University of Applied Sciences HM Lothstraße 34 80335 Munich Germany

3. Theoretical Inorganic Chemistry Faculty of Chemistry University of Duisburg‐Essen Universitätsstraße 5 45141 Essen Germany

4. Cluster of Excellence RESOLV 44801 Bochum Germany

5. Center for Nanointegration (CENIDE) Duisburg‐Essen 47057 Duisburg Germany

Abstract

AbstractPulsed laser fragmentation of microparticles (MPs) in liquid is a synthesis method for producing high‐purity nanoparticles (NPs) from virtually any material. Compared with laser ablation in liquids (LAL), the use of MPs enables a fully continuous, single‐step synthesis of colloidal NPs. Although having been employed in several studies, neither the fragmentation mechanism nor the efficiency or scalability have been described. Starting from time‐resolved investigations of the single‐pulse fragmentation of single IrO2 MPs in water, the contribution of stress‐mediated processes to the fragmentation mechanism is highlighted. Single‐pulse, multiparticle fragmentation is then performed in a continuously operated liquid jet. Here, 2 nm‐sized nanoclusters (NCs) accompanied by larger fragments with sizes ranging between several ten nm and several µm are generated. For the nanosized product, an unprecedented efficiency of up to 18 µg J−1 is reached, which exceeds comparable values reported for high‐power LAL by one order of magnitude. The generated NCs exhibit high catalytic activity and stability in oxygen evolution reactions while simultaneously expressing a redox‐sensitive fluorescence, thus rendering them promising candidates in electrocatalytic sensing. The provided insights will pave the way for laser fragmentation of MPs to become a versatile, scalable yet simple technique for nanomaterial design and development.

Funder

Deutsche Forschungsgemeinschaft

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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