The Electron Energy-Loss Spectroscopy (EELS) and X-ray Absorption Spectroscopy (XAS) database has been completely rewritten, with an improved design, user interface and a 3 number of new tools. The database is accessible at https://eelsdb.eu/ and can now be used without registration. The submission process has been streamlined to encourage spectrum submissions and the new design gives greater emphasis on contributors' original work by highlighting their papers. With numerous new filters and a powerful search function, it is now simple to explore the database of several hundred of EELS and XAS spectra. Interactive plots allow spectra to be overlaid, facilitating online comparison. An application-programming interface has been created, allowing external tools and software to easily access the information held within the database. In addition to the database itself, users can post and manage job adverts and read the latest news and events regarding the EELS and XAS communities. In accordance with the ongoing drive towards open access data increasingly demanded by funding bodies, the database will facilitate open access data sharing of EELS and XAS spectra.
Above
a critical diameter, single- or few-walled carbon nanotubes
spontaneously collapse as flattened carbon nanotubes. Raman spectra
of isolated flattened and cylindrical carbon nanotubes have been recorded.
The collapse provokes an intense and narrow D band, despite the absence
of any lattice disorder. The curvature change near the edge cavities
activates a D band, despite framework continuity. Theoretical calculations
based on Placzek approximation fully corroborate this experimental
finding. Usually used as a tool to quantify defect density in graphenic
structures, the D band cannot be used as such in the presence of a
graphene fold. This conclusion should serve as a basis to revisit
materials comprising structural distortion where poor carbon organization was concluded on a Raman
basis. Our finding also emphasizes the different visions of a defect
between chemists and physicists, a possible source of confusion for
researchers working in nanotechnologies.
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