Zhongfan , Z., L. Li and J.C. Yang, “Adhesion of Pt Nanoparticles Supported on γ-Al2O3 Single Crystal”, The Journal of Physical Chemistry, Vol. 117(41), pp. 21407-21412, 2013. DOI: 10.1021/jp407798b
A model catalyst system of Pt nanoparticles (2–5 nm) dispersed on γ-Al2O3 (111) was prepared to study the support effects on nanoparticles shape and structure by cross-sectional high-resolution electron microscopy. A dewetting equilibrium shape of Pt nanoparticles was observed with a low-index plane orientation relation: Pt(111)∥γ-Al2O3(111) and Pt(100)∥γ-Al2O3(111). Lattice-matching epitaxy of Pt(110)∥γ-Al2O3(110) was found across their interface to maintain a minimum interface strain during particle growth. To quantitatively interpret the interfacial energy and adhesion energy of the nanoparticles, the Wulff–Kaischew theorem was applied by taking into account the γ-Al2O3 support modifications to the equilibrium shape of nanoparticles. The present approach quantitatively solved the adhesion energy of the particle/support and could help to interpret nanoparticles equilibrium shape and stability.
To read more from this publication, please click here.