Evaluating Nondestructive Quantification of Composition Gradients in Metal-Organic Frameworks by MeV Ion Microbeam Analysis.

ABSTRACT: We evaluate a method to quantify composition depth gradients in intact metal-organic framework (MOF) single crystals and thereby derive diffusion coefficients of postsynthetically incorporated active sites by nondestructive ion-beam microanalysis. Zr-based UiO-67-bpy (bpy = 2,2'-bipyridine-5,5'-dicarboxylic acid) MOFs were synthesized on Si substrates and then metalated postsynthetically with NiCl₂ for 2-48 h, resulting in different Ni depth distributions. Simultaneous micro-Rutherford backscattering spectrometry (μ-RBS) and micro-particle induced X-ray emission (μ-PIXE) analysis were used for the spatially resolved chemical analysis of the MOF single crystals. Qualitative assessment of the μ-RBS spectra indicated the presence of elemental depth gradients and hinted at the gover

SUBMITTER: Nagy G 

PROVIDER: S-EPMC11428091 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature