W/Mo-Oxide Nanomaterials: Structure−Property Relationships and Ammonia-Sensing Studies Ying Zhou Kaibo Zheng Jan-Dierk Grunwaldt Thomas Fox Leilei Gu Xiaoliang Mo Guorong Chen Greta R. Patzke 10.1021/jp106439n.s001 https://acs.figshare.com/articles/journal_contribution/W_Mo_Oxide_Nanomaterials_Structure_Property_Relationships_and_Ammonia_Sensing_Studies/2694940 W/Mo-oxides of the hexagonal tungsten bronze (HTB) type have been investigated by X-ray absorption spectroscopy to obtain detailed insight into the substitution process of W by Mo that leads to mixed HTB frameworks. Both the morphology of the nanostructured W/Mo-HTBs as well as the oxidation state of Mo are significantly influenced through the incorporation of different alkali cations into the hexagonal channels of this open structure. A variety of complementary analytical methods, including TG, in situ and ex situ XRD, SEM, and solid-state NMR analyses, were applied to determine the thermal stability of the obtained W/Mo-HTB materials with respect to their alkali cation and NH<sub>4</sub><sup>+</sup> contents. A strong correlation between composition and stability was found with the Rb-W/Mo-HTBs exhibiting the highest structural and morphological resistance among the series (up to 580 °C). The NH<sub>3</sub>-sensing properties of selected W/Mo-oxides in test atmospheres furthermore point to promising features of the Rb-stabilized hexagonal framework materials. 2011-02-03 00:00:00 alkali cation series insight substitution process resistance StudiesW morphology alkali cations test atmospheres NMR analyses NH Relationship absorption HTB frameworks content stability TG SEM type method XRD Mo framework materials incorporation Nanomaterial oxidation state tungsten bronze variety nanostructured spectroscopy correlation