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

Neumann, S.; Grotheer, S.; Tielke, J.; Schrader, I.; Quinson, J.; Zana, Alessandro; Oezaslan, M.; Arenz, Matthias; Kunz, S. (2017). Nanoparticles in a box: a concept to isolate, store and re-use colloidal surfactant-free precious metal nanoparticles. Journal of materials chemistry. A, 5(13), pp. 6140-6145. Royal Society of Chemistry 10.1039/c7ta00628d

Text C7TA00628D.pdf - Published Version Restricted to registered users only Available under License Publisher holds Copyright. Download (626kB) | Request a copy

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.

Interest & Impact

Downloads

0 since deposited on 17 Apr 2018
0 in the past 12 months

Citations

5 Citations in Web of Science ®
6 Citations in Scopus

Search

in Google Scholar™

Services

Actions (login required)

Edit item

Actions (login required)

Edit item