Nanoparticles in a box: a concept to isolate, store and re-use colloidal surfactant-free precious metal nanoparticles

Sarah Neumann; Sarah Grotheer; Julia Tielke; Imke Schrader; Jonathan Quinson; Alessandro Zana; Mehtap Oezaslan; Matthias Arenz; Sebastian Kunz

doi:10.1039/c7ta00628d

Nanoparticles in a box: a concept to isolate, store and re-use colloidal surfactant-free precious metal nanoparticles

Sarah Neumann, Sarah Grotheer, Julia Tielke, Imke Schrader, Jonathan Quinson, Alessandro Zana, Mehtap Oezaslan, Matthias Arenz, Sebastian Kunz

Department of Chemistry

26 Citations (Scopus)

Abstract

A concept is introduced that allows for the isolation, storage and re-use of surfactant-free precious metal nanoparticles (NPs) of catalytic relevance (Pt and Ru). “Surfactant-free NPs” well-defined in size (1–2 nm) are prepared in alkaline ethylene glycol. After synthesis these NPs are stabilized by surface bound CO, formed during synthesis by solvent oxidation, and OH−, added to the reaction mixture. We present a protocol that allows switching reversibly the stabilization between a “CO-protected” and “OH−-protected state”. Most importantly, “OH−-protected” Pt and Ru NPs exhibit remarkable resistance against sintering. These NPs can be isolated as solids, stored and “put into boxes” to be shipped. Thereafter they can be redispersed without changes in particle size or loss in catalytic activity. These results are expected to be of scientific and industrial relevance, as a methodology is introduced to handle “surfactant-free” catalytic nanoparticles like a normal solid chemical

Original language	English
Journal	Journal of Materials Chemistry A
Volume	5
Issue number	13
Pages (from-to)	6140-6145
Number of pages	6
ISSN	2050-7488
DOIs	https://doi.org/10.1039/c7ta00628d
Publication status	Published - 2017

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10.1039/c7ta00628d

Cite this

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title = "Nanoparticles in a box: a concept to isolate, store and re-use colloidal surfactant-free precious metal nanoparticles",

abstract = "A concept is introduced that allows for the isolation, storage and re-use of surfactant-free precious metal nanoparticles (NPs) of catalytic relevance (Pt and Ru). “Surfactant-free NPs” well-defined in size (1–2 nm) are prepared in alkaline ethylene glycol. After synthesis these NPs are stabilized by surface bound CO, formed during synthesis by solvent oxidation, and OH−, added to the reaction mixture. We present a protocol that allows switching reversibly the stabilization between a “CO-protected” and “OH−-protected state”. Most importantly, “OH−-protected” Pt and Ru NPs exhibit remarkable resistance against sintering. These NPs can be isolated as solids, stored and “put into boxes” to be shipped. Thereafter they can be redispersed without changes in particle size or loss in catalytic activity. These results are expected to be of scientific and industrial relevance, as a methodology is introduced to handle “surfactant-free” catalytic nanoparticles like a normal solid chemical",

author = "Sarah Neumann and Sarah Grotheer and Julia Tielke and Imke Schrader and Jonathan Quinson and Alessandro Zana and Mehtap Oezaslan and Matthias Arenz and Sebastian Kunz",

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T2 - a concept to isolate, store and re-use colloidal surfactant-free precious metal nanoparticles

AU - Neumann, Sarah

AU - Grotheer, Sarah

AU - Tielke, Julia

AU - Schrader, Imke

AU - Quinson, Jonathan

AU - Zana, Alessandro

AU - Oezaslan, Mehtap

AU - Arenz, Matthias

AU - Kunz, Sebastian

PY - 2017

Y1 - 2017

N2 - A concept is introduced that allows for the isolation, storage and re-use of surfactant-free precious metal nanoparticles (NPs) of catalytic relevance (Pt and Ru). “Surfactant-free NPs” well-defined in size (1–2 nm) are prepared in alkaline ethylene glycol. After synthesis these NPs are stabilized by surface bound CO, formed during synthesis by solvent oxidation, and OH−, added to the reaction mixture. We present a protocol that allows switching reversibly the stabilization between a “CO-protected” and “OH−-protected state”. Most importantly, “OH−-protected” Pt and Ru NPs exhibit remarkable resistance against sintering. These NPs can be isolated as solids, stored and “put into boxes” to be shipped. Thereafter they can be redispersed without changes in particle size or loss in catalytic activity. These results are expected to be of scientific and industrial relevance, as a methodology is introduced to handle “surfactant-free” catalytic nanoparticles like a normal solid chemical

AB - A concept is introduced that allows for the isolation, storage and re-use of surfactant-free precious metal nanoparticles (NPs) of catalytic relevance (Pt and Ru). “Surfactant-free NPs” well-defined in size (1–2 nm) are prepared in alkaline ethylene glycol. After synthesis these NPs are stabilized by surface bound CO, formed during synthesis by solvent oxidation, and OH−, added to the reaction mixture. We present a protocol that allows switching reversibly the stabilization between a “CO-protected” and “OH−-protected state”. Most importantly, “OH−-protected” Pt and Ru NPs exhibit remarkable resistance against sintering. These NPs can be isolated as solids, stored and “put into boxes” to be shipped. Thereafter they can be redispersed without changes in particle size or loss in catalytic activity. These results are expected to be of scientific and industrial relevance, as a methodology is introduced to handle “surfactant-free” catalytic nanoparticles like a normal solid chemical

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