Category Chemistry/Nanotechnology

The researchers from the Faculty of Physics of the Moscow State University have grown organic crystals that allow creating flexible electronic devices. Credit: Dmitry Yu. Paraschuk et al.

Scientists from Faculty of Physics Moscow State University have grown organic semiconductor crystals which can reduce the cost of the process of creating light, flexible and transparent light-emitting electronic devices of the new generation. It has high light-emitting efficiency that promise a bright future for wet-processed organic optoelectronics. They also made a double breakthrough using much simpler and cheaper technologies that previously were considered impractical.

The organic optoelectronics is a rapidly growing area including organic light-emitting transistors (OLET) and organic lasers pumped b...

The new nanoscale manufacturing process draws zinc to the surface of a liquid, where it forms sheets just a few atoms thick. Credit: Xudong Wang

After 6 yrs of painstaking effort, Uni of Wisconsin-Madison materials scientists believe the tiny sheets of the semiconductor zinc oxide they’re growing could have huge implications for the future of a host of electronic and biomedical devices. Xudong Wang et al have developed a technique for creating nearly 2D sheets of compounds that do not naturally form such thin materials. Nanomaterials have unique electronic and chemical properties compared to identically composed materials at larger, conventional scales. Until now, they were limited to working with naturally occurring 2-D nanosheets eg graphene...

GA structure and sample/structure evolution from initial compounds to final NbN superconductors. (A) GA before and after processing, with the unit cell indicated by the black cube. (B) (Top) Chemical structures of compounds and (bottom) schematic of synthesis and processing steps with photographs of the final materials. Block terpolymers (ISO) are combined with the Nb2O5 sol-gel precursors in a common solvent. Hybrid block copolymer/Nb2O5 GA structures are generated by solvent evaporation–induced self-assembly. After calcination in air, the mesoporous Nb2O5 GAs are transformed to NbN GAs in a two-step nitriding process. Scale bars in all photographs represent 1 cm. NH3, ammonia.

Building on nearly 2 decades’ worth of research, Prof...

Scientists baked a leaf to demonstrate a battery. Credit: Image courtesy of Maryland NanoCenter

Scientists have a new recipe for batteries: Bake a leaf, add sodium. They used a carbonized oak leaf, pumped full of sodium, as a demonstration battery’s anode. Other studies have shown that melon skin, banana peels and peat moss can be used in this way, but a leaf needs less preparation. The scientists are trying to make a battery using sodium where most rechargeable batteries sold today use lithium. Sodium would hold more charge, but can’t handle as many charge-and-discharge cycles as Li can.

One of the roadblocks has been finding an anode material that is compatible with sodium, which is slightly larger than lithium...