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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	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 Journal Of Materials Chemistry A DOI: 10.1039/C7TA00628D Diamond Proposal Number(s): [12746] Show Abstract ▼ 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 re-dispersed 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.	Mar 2017

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B18-Core EXAFS

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

Journal Of Materials Chemistry A

DOI: 10.1039/C7TA00628D

Diamond Proposal Number(s): [12746]

Show Abstract ▼

Mar 2017