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

DOI: 10.1039/C7TA00628D DOI Help

Authors: Sarah Neumann (Institute of Applied and Physical Chemistry (IAPC), University of Bremen) , Sarah Grotheer (Institute of Applied and Physical Chemistry (IAPC), University of Bremen) , Julia Tielke (Institute of Applied and Physical Chemistry (IAPC), University of Bremen) , Imke Schrader (Institute of Applied and Physical Chemistry (IAPC), University of Bremen) , Jonathan Quinson (University of Copenhagen) , Alessandro Zana (University of Copenhagen) , Mehtap Oezaslan (Carl von Ossietzky University of Oldenburg) , Matthias Arenz (University of Berne; University of Copenhagen) , Sebastian Kunz (Institute of Applied and Physical Chemistry (IAPC), University of Bremen)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Materials Chemistry A

State: Published (Approved)
Published: March 2017
Diamond Proposal Number(s): 12746

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.

Subject Areas: Materials, Chemistry


Instruments: B18-Core EXAFS

Added On: 09/03/2017 12:00

Discipline Tags:

Physical Chemistry Catalysis Chemistry Materials Science Nanoscience/Nanotechnology

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) Extended X-ray Absorption Fine Structure (EXAFS)