Andersson Gunther G, Golovko Vladimir B, Alvino Jason F, Bennett Trystan, Wrede Oliver, Mejia Sol M, Al Qahtani Hassan S, Adnan Rohul, Gunby Nathaniel, Anderson David P, Metha Gregory F
Flinders Centre for NanoScale Science and Technology, Flinders University, Adelaide SA 5001, Australia.
Department of Chemistry, University of Adelaide, Adelaide SA 5005, Australia.
J Chem Phys. 2014 Jul 7;141(1):014702. doi: 10.1063/1.4884642.
Chemically made, atomically precise phosphine-stabilized clusters Au9(PPh3)8(NO3)3 were deposited on titania and silica from solutions at various concentrations and the samples heated under vacuum to remove the ligands. Metastable induced electron spectroscopy was used to determine the density of states at the surface, and X-ray photoelectron spectroscopy for analysing the composition of the surface. It was found for the Au9 cluster deposited on titania that the ligands react with the titania substrate. Based on analysis using the singular value decomposition algorithm, the series of MIE spectra can be described as a linear combination of 3 base spectra that are assigned to the spectra of the substrate, the phosphine ligands on the substrate, and the Au clusters anchored to titania after removal of the ligands. On silica, the Au clusters show significant agglomeration after heat treatment and no interaction of the ligands with the substrate can be identified.
通过化学合成得到原子精确的膦稳定簇合物Au9(PPh3)8(NO3)3，将其从不同浓度的溶液中沉积在二氧化钛和二氧化硅上，并在真空中加热样品以去除配体。利用亚稳诱导电子能谱确定表面的态密度，用X射线光电子能谱分析表面组成。研究发现，沉积在二氧化钛上的Au9簇合物的配体会与二氧化钛底物发生反应。基于奇异值分解算法的分析，一系列亚稳诱导电子能谱可描述为3种基本谱的线性组合，这3种基本谱分别对应于底物的谱、底物上的膦配体的谱以及去除配体后锚定在二氧化钛上的金簇的谱。在二氧化硅上，金簇在热处理后出现明显团聚，且未发现配体与底物之间的相互作用。
