The MacDiarmid Institute for Advanced Materials and Nanotechnology, and Department of Chemistry, University of Canterbury, Christchurch 8140, New Zealand.
Phys Chem Chem Phys. 2013 Sep 21;15(35):14806-13. doi: 10.1039/c3cp52497c.
Synchrotron XPS was used to investigate a series of chemically synthesised, atomically precise gold clusters Au(n)(PPh3)y (n = 8, 9 and 101, y depending on the cluster size) immobilized on anatase (titania) nanoparticles. Effects of post-deposition treatments were investigated by comparison of untreated samples with analogues that have been heat treated at 200 °C in O2, or in O2 followed by H2 atmosphere. XPS data shows that the phosphine ligands are oxidised upon heat treatment in O2. From the position of the Au 4f(7/2) peak it can be concluded that the clusters partially agglomerate immediately upon deposition. Heating in oxygen, and subsequently in hydrogen, leads to further agglomeration of the gold clusters. It is found that the pre-treatment plays a crucial role in the removal of ligands and agglomeration of the clusters.
同步辐射 XPS 被用于研究一系列通过化学合成得到的、原子级精确的金纳米簇 Au(n)(PPh3)y（n = 8、9 和 101，y 取决于纳米簇的尺寸），这些纳米簇被固定在锐钛矿（二氧化钛）纳米颗粒上。通过比较未经处理的样品和在 200°C 的 O2 中或在 O2 后再在 H2 气氛中进行热处理的类似物，研究了后沉积处理的影响。XPS 数据表明，在 O2 中进行热处理时，膦配体被氧化。从 Au 4f(7/2) 峰的位置可以得出结论，纳米簇在沉积后立即部分团聚。在氧气中加热，然后在氢气中加热，导致金纳米簇进一步团聚。研究发现，预处理在配体的去除和纳米簇的团聚中起着至关重要的作用。
