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