Au/TiO₂ catalysts were developed by growing thin titania films via atomic layer deposition (ALD) on a high-surface-area silica support (SBA-15) to test the effect of both the film thickness and the order of deposition. The physical characteristics of both titania and gold phases were similar in all catalysts except for the thickness of the former, which was varied by using one to four ALD cycles. However, it was found that if the titania film is deposited after the gold nanoparticles, it partially covers the metal surface and reduces the catalytic activity (compared with the case where the gold is deposited last). In those samples, X-ray photoelectron spectroscopy (XPS) data showed a large fraction of partially positively charged Au atoms, and titration of surface sites with CO and infrared absorption spectroscopy detection identified a large fraction of low-coordination Ti sites, with a surface coverage that increased with titania film thickness.

Au/TiO ₂催化剂是通过在高表面积二氧化硅载体 (SBA-15) 上通过原子层沉积 (ALD) 生长二氧化钛薄膜来开发的，以测试薄膜厚度和沉积顺序的影响。所有催化剂中二氧化钛和金相的物理特性均相似，但前者的厚度因使用一到四次 ALD 循环而变化。然而，发现如果在金纳米粒子之后沉积二氧化钛膜，则其部分覆盖金属表面并降低催化活性（与最后沉积金的情况相比）。在这些样品中，X 射线光电子能谱 (XPS) 数据显示大部分带正电的 Au 原子，用 CO 滴定表面位点和红外吸收光谱检测识别出大部分低配位 Ti 位点，表面具有覆盖率随着二氧化钛薄膜厚度的增加而增加。