Solid-State NMR Studies of the Photochromic Effects of Thin Films of Oxygen-Containing Yttrium Hydride

• DOI: 10.1021/jp507248c
• Publication Date: 2014-09-26T15:43:41Z
• Authors: C. Vinod Chandran; Herman Schreuders; Bernard Dam; Johannes W. G. Ja...; Jacob Bart; Arno P. M. Kentgens; P. Jan M. van Bentum
• Keywords: Magic angle spinning

Oxygen-containing yttrium hydride thin films show a unique reversible change in optical properties as result of illumination. In this article, different solid-state NMR methods are used to follow the changes during such photochromic process. The novel stripline probe technology provides high sensitivity for experiments on film samples with thickness approximately 1 μm. A key observation is that these spectral evidence highly mobile hydrogen species, which disappears upon illumination white light. relaxation back transparent phase observed after few days, accompanied by reappearance proton signal. These results compared pure films. Magic-angle spinning 1H and 89Y performed obtain detailed information polycrystalline flexible particular, MAS indicate local environment Y nucleus structural model not yet clear, but present observations may give some hints toward model.