Noble metal nanoparticles and their preparation process

V. Franco Puntes, E.E. González

Institut Català de Nanotecnologia (ICN), Institució Catalana de Recerca i Estudis Avançats (ICREA)

In this invention we have developed nanoparticles comprising two or three levels of noble metals, with multiple walls and with a hollow interior. The process for the production of these nanoparticles with these noble metal layers comes from refined methods based on traditional corrosion techniques (the Kirkendall effect and galvanic, pitting, etching and de alloying corrosion processes), and are performed at room temperature, making it possible to scale up the procedure for large production. The overall idea and methods allow for a better control of the interior morphology of the nanoparticles, which include open boxes, bimetallic and trimetallic double-walled open boxes with pores, multiwalled/multichamber boxes, double-walled, porous and multichamber nanotubes, nanoframes, noble metal fullerenes, and others, made of silver, gold, platinum and/or palladium.

Reference papers:  González, E., Arbiol, J., Puntes, V. F. (2011). Carving at the Nanoscale: Sequential Galvanic Exchange and Kirkendall Growth at Room Temperature. Science, 334, 1377-1380.

Patent info: Patent No. WO 2012/123435 (Priority date: March 14, 2011) [Status: Public]

Gallery of TEM images of hollow nanoparticles produced by refined corrosion processes.

Detail of a cubic nanocage made of gold and silver.

High yield production of nanocages.


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