MRSEC researchers have developed the materials necessary to embed GHz speed electronic photodetectors into micron diameter channels in optical fibers.

An international team studying the motion of  both bacteria and similar-sized artificial  catalytic nanomotors has found that they transfer momentum to their surroundings in a  similar way, despite their very different  propulsion mechanisms.

Ferroelectric ferromagnets are a holy grail of materials research, since they would enable electrically  switchable magnetism with diverse potential applications in information technology, sensing and new  “electro-magneto-mechanical” devices.

MRSEC scientists and collaborators have shown [1] that the localized buckling of a compressed thin sheet, important for molecular interfaces, [2] has the same mathematical origin as the localization of kinetic energy in a line of swinging pendulums.  It is a form of soliton. 

Luping Yu, Dmitri Talapin and collaborators from the University of Chicago MRSEC are working to develop highly efficient bulk heterojunction organic solar cells.  They have recently created composite polymer solar cells from a combination of the semiconducting polymer, PTB7, PC71BM, and doped multiwall carbon nanotubes (MCNT--these MCNT are doped with N (nitrogen), 

Highly-symmetrized MnAu nanoalloys may possess high magnetic moments for potential application. The magnetic properties of MnAu nanoclusters exhibit strong dependence on the cluster sizes and morphologies.

The detection of noxious gases or bio-agents is important for various environmental and security needs. High sensitivity, sufficient selectivity and molecular recognition are key characteristics for such sensing. Nebraska MRSEC researchers have developed a scheme for molecular sensing using magnetic tracer particles and a microcantilever torsional magnetometer. An example of using this system with a detection process is illustrated in the Figure below.

To change the magnetization of a ferromagnet usually requires a magnetic field.  So, for example, if we put a compass needle into the high field of an MRI machine, we can no longer trust it to swivel to the North.  Similarly, the magnetic stripes on credit cards and key cards can be destroyed in high magnetic fields.  Electric fields don’t have the same effect on magnetic materials, which is just as well for everyday applications.

Photovoltaics is a method of converting solar radiation into electricity.  Some semiconducting materials exhibit a property known as the photoelectric effect that causes them to absorb light and release electrons. In addition to the semiconductors, ferroelectric materials have been employed to create ferroelectric-photovoltaic devices. In these devices, a ferroelectric thin film is used as a light absorbing layer and the electric field created by ferroelectric polarization is the driving force for the photocurrent.