Olmos-Asar Jimena A, Vesselli Erik, Baldereschi Alfonso, Peressi Maria
Department of Physics, University of Trieste, Strada Costiera 11, 34151 Trieste, Italy.
Phys Chem Chem Phys. 2015 Nov 14;17(42):28154-61. doi: 10.1039/c5cp00304k. Epub 2015 Mar 20.
The adsorption and the nucleation of different transition metals (Fe, Co, Ni, Cu, Pd, Ag, and Au) on alumina/Ni3Al(111) have been studied to shed light on the first stages of the synthesis of supported nanoparticles, focusing in particular on the possibility of producing ordered arrays. Affinity for oxygen, atomic radii, electronic properties and kinetics have been taken into account to rationalize the different behavior. In agreement with empirical findings, Pd is confirmed to be the best choice for a highly ordered nucleation following the "dot" superstructure of the alumina, due to a remarkable preference for the corresponding adsorption sites (holes) with respect to others, and for a rather strong binding. Atom by atom nucleation of this material has been studied, for seeds up to 6 atoms that offer a stiff anchoring of nanoparticles to the support.
研究了不同过渡金属（铁、钴、镍、铜、钯、银和金）在氧化铝/Ni3Al(111)上的吸附和成核过程，以阐明负载型纳米颗粒合成的初始阶段，尤其关注制备有序阵列的可能性。考虑了对氧的亲和力、原子半径、电子性质和动力学，以解释不同的行为。与实验结果一致，由于相对于其他吸附位点（空穴），钯对相应吸附位点（空穴）有明显的偏好且结合力较强，因此被证实是遵循氧化铝“点”超结构进行高度有序成核的最佳选择。已研究了这种材料的逐个原子成核过程，对于多达6个原子的晶种，其能使纳米颗粒牢固地锚定在载体上。
