Analogous to the unique spectral fingerprint of any atom or molecule, researchers have measured the spectrum of optical excitations in monolayer tungsten diselenide (WSe2), which is a member of a new family of ultrathin semiconductors that are just one atomic layer thick.
A unique way to bond together single-layer semiconductors opens a door to new nanotechnologies.
Paul Dunk, a chemist in the MagLab's Ion Cyclotron Resonance Facility, has published a paper on so-called "nanocages" formed by combining graphite, a two-dimensional form of carbon, with different metals. The research, Transformation of doped graphite into cluster-encapsulated fullerene cages, appeared this week in Nature Communications.
For the research, Dunk and his collaborators created metallofullerenes, molecules that consist of a ball-like carbon structure that encompasses several atoms inside of it — hence the term "nanocage."
Dunk and his colleagues tested theories of how these compounds form by looking for hypothesized intermediate molecules between the original reactants and end products. They demonstrated that, unlike what many scientists believed, the cages do not shrink from or break off of larger globs of carbon, but rather nucleate around the metal, carbon atom by carbon atom.
The findings could help in the future development of nanocage-related technologies ranging from new light-based electronics to molecular electronics.
Dunk's research was done in collaboration with scientists at the Universitat Rovira i Virgili in Spain and the University of Texas at El Paso.
Read more about this research in the MagLab's fields magazine.
Image of nanocages by Paul Dunk/Caroline McNiel.
Bi-2223 shows promise for 30-tesla all-superconducting instrument for nuclear magnetic resonance.
With just a drop of water, a cobalt-based material changes both color and magnetic properties.
Using high-field electromagnets, scientists explore a promising alternative to the increasingly expensive rare earth element widely used in motors.
New technique transforms common materials into powerful magnets.
From nanorockets to nanocages, good science can come in tiny packages — all with the aim of solving really big problems.
A lot of the research conducted in powerful magnets ends up having a powerful effect on our day-to-day lives.
In the field of inorganic chemistry, magneto-structural correlations have been used to rationally design molecules with desirable properties, and to relate these properties to the electronic and geometric structures. In turn, such studies provide powerful tools for understanding important catalytic processes, as well as elucidating the structures of active sites in metalloproteins. This study reveals an unusually strong sensitivity of the magnetic properties of a CoS4 molecule to minute changes in its structure.