Aggregation Behavior of Ligand-Protected Au₉ Clusters on Sputtered Atomic Layer Deposition TiO₂

Abstract

Au 9 (PPh 3 ) 8 )](NO 3 ) 3 (Au 9 ) clusters were deposited onto sputtered ALD titania surfaces. Atomic force microscopy (AFM) was used to determine the height and distributions of the Au 9 clusters over the titania surface fabricated using atomic layer deposition (ALD). Synchrotron X-ray photoelectron spectroscopy (XPS) was used to derive information about the degree of agglomeration of the Au 9 clusters due to the annealing process. Both AFM and XPS show that the Au 9 clusters deposited on ALD titania are partially agglomerated after annealing. Deposition of the [Au 9 (PPh 3 ) 8 )](NO 3 ) 3 clusters on sputtered ALD titania is compared with deposition of the same cluster on titania nanosheets of previous work.

The interaction of size-selected Ru3 clusters with RF-deposited TiO2: probing Ru–CO binding sites with CO-temperature programmed desorption

“…TiO 2 is a photocatalytically active substrate 30 and is a common choice as a substrate for the deposition of clusters. 19,20,[31][32][33][34][35][36][37][38][39][40][41][42][43] Here we used RF-deposited TiO 2 as a substrate. It is a nanoparticulate form of TiO 2 made by radio frequency (RF) sputtering a TiO 2 wafer onto a substrate (sputter deposition) under UHV, in the present case Si (100).…”

Metal Clusters on Semiconductor Surfaces and Application in Catalysis with a Focus on Au and Ru

“…However, the deposition energy required for pinning varies depending on the cluster species, cluster size, and support material. A more controllable approach to trapping clusters at local defect sites is to first create defects in a controlled way by sputtering or heating the support, and then follow this with a soft‐landing deposition to exploit the preferential binding of clusters to defect zones . This preferential binding is further discussed in Section .…”

Suppression of phosphine-protected Au9 cluster agglomeration on SrTiO3 particles using a chromium hydroxide layer

“…Through the XPS final state effect, the size of the phosphine-protected Au 9 clusters can be determined using the Au 4f 7/2 peak position and the FWHM. 23,[53][54][55][56][57] The peak position of phosphine-protected without a CrO x layer. However, more than 80% of the Au 4f intensity for both samples are at the HBP, indicating that most of the Au 9 clusters remain non-agglomerated.…”