Revealing the Formation of Copper Nanoparticles from a Homogeneous Solid Precursor by Electron Microscopy.

Journal of the American Chemical Society
Roy van den BergStig Helveg

Abstract

The understanding of processes leading to the formation of nanometer-sized particles is important for tailoring of their size, shape and location. The growth mechanisms and kinetics of nanoparticles from solid precursors are, however, often poorly described. Here we employ transmission electron microscopy (TEM) to examine the formation of copper nanoparticles on a silica support during the reduction by H2 of homogeneous copper phyllosilicate platelets, as a prototype precursor for a coprecipitated catalyst. Specifically, time-lapsed TEM image series acquired of the material during the reduction process provide a direct visualization of the growth dynamics of an ensemble of individual nanoparticles and enable a quantitative evaluation of the nucleation and growth of the nanoparticles. This quantitative information is compared with kinetic models and found to be best described by a nucleation-and-growth scenario involving autocatalytic reduction of the copper phyllosilicate followed by diffusion-limited or reaction-limited growth of the copper nanoparticles. The plate-like structure of the precursor restricted the diffusion of copper and the autocatalytic reduction limited the probability for secondary nucleation. The combination...Continue Reading

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Citations

Dec 13, 2017·Proceedings of the National Academy of Sciences of the United States of America·Tung-Han YangYounan Xia
Feb 6, 2020·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Mark J MeijerinkJovana Zečević
Jul 17, 2018·ACS Nano·Jessi E S van der HoevenPetra E de Jongh

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