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Uniform tungsten trimers stand and deliver

g to develop, White said. The collaborators employed specialized equipment available from the William R. Wiley Environmental Molecular Sciences Laboratory, a DOE user facility located at PNNL, to prepare and characterize the platform as well as the clusters. Using a unique approach that changed the tungsten oxide directly from a solid to a gas, the collaborators stabilized the molecular rings ?or "trimers" ?of tungsten on the titanium platform.

A scanning tunneling microscope imaged not only the trimers but also their consistent alignment with the single crystal structure of the platform. "A scanning tunneling microscope must be so stable that we have to vibrationally isolate the instrument. It cannot move even a small amount because we are using a stream of electrons to measure the distance from the microscope's tip to a small space between atoms," White explained. The collaborators also characterized the cluster mass, determined the ratio of tungsten to oxygen atoms in the cluster, and used X-ray photoelectron spectroscopy to identify the tungsten oxidation state.

"This is a small piece of the basic science that could lead to control of chemical transformations for our energy future," White said, noting that this is the first time researchers have created and imaged monodisperse oxide clusters on another oxide.


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Source:DOE/Pacific Northwest National Laboratory


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