Magnard Nicolas P L, Abbondanza Giuseppe, Junkers Laura S, Glatthaar Lorena, Grespi Andrea, Spriewald Luciano Alexander, Igoa Saldaña Fernando, Dippel Ann-Christin, Vinogradov Nikolay, Over Herbert, Jensen Kirsten M Ø, Lundgren Edvin
Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark.
Department of Physics, Chalmers University of Technology, Chalmersplatsen 4, Gothenburg 41296, Sweden.
ACS Appl Mater Interfaces. 2025 Aug 20;17(33):46887-46898. doi: 10.1021/acsami.5c05251. Epub 2025 Aug 11.
Thanks to its ability to form a lattice of self-ordered nanosized pores, nanoporous anodic aluminum oxide (NP-AAO) is a promising material with diverse applications, for example, as membrane for the controlled deposition of catalysts. NP-AAO is obtained by the anodization of an aluminum substrate under specific pH and voltage conditions. However, the growth mechanism of the oxide is still under debate. We shed light on this process by investigating structural changes at the atomic scale using pair distribution function (PDF) analysis. We thus performed X-ray total scattering experiments under grazing incidence conditions during the anodization of aluminum substrates exhibiting different crystallographic facets. By doing so, we were able to track the evolution of the local structure of aluminum oxide species forming at the oxide-electrolyte interface over time.
由于其能够形成自有序纳米尺寸孔的晶格，纳米多孔阳极氧化铝（NP-AAO）是一种具有多种应用前景的材料，例如，用作催化剂可控沉积的膜。NP-AAO是通过在特定的pH值和电压条件下对铝基板进行阳极氧化而获得的。然而，氧化物的生长机制仍在争论中。我们通过使用对分布函数（PDF）分析研究原子尺度的结构变化，来阐明这一过程。因此，我们在对具有不同晶体学面的铝基板进行阳极氧化期间，在掠入射条件下进行了X射线全散射实验。通过这样做，我们能够追踪在氧化物-电解质界面处形成的氧化铝物种的局部结构随时间的演变。
