|News in Brief [59-77]
By systematically investigating a large number of single-and double-gated bilayer graphene (BLG) devices, US researcher observed a bimodal distribution of minimum conductivities at the charge neutrality point.
Researchers at School of Electrical and Computer Engineering, Purdue University (US), propose in PNAS a Flexure-FET (flexure sensitive Field Effect Transistor) ultrasensitive biosensor that utilizes the nonlinear electromechanical coupling to overcome the fundamental sensitivity limits of classical electrical or mechanical nanoscale biosensors.
Researcher at Nanjing University (China), and Stanford University (US) report in PNAS a scalable and versatile synthesis of multifunctional polyaniline (PAni) hydrogel with excellent electronic conductivity and electrochemical properties.
Dmitry Turchinovich (DTU Fotonik, Denmark, and Max Planck Institute for Polymer Research, Germany), Jørn M. Hvam (DTU), and Matthias C. Hoffmann (SLAC Linear Accelerator Laboratory, USA) have recently reported on the direct observation of a nonlinear-optical effect, occurring in the regime of single-cycle pulse of light at terahertz (THz) frequencies. They used a doped semiconductor as an efficient nonlinear medium, where the THz-range optical nonlinearity arises from the response of free-electron plasma to THz electric fields. One of the discoveries in this work was the coexistence of both positive and negative refractive index nonlinearity within the broad spectrum of a single-cycle THz pulse.
Researchers at the Institute of Photonic Sciences (ICFO) in Barcelona, Spain, thought about the possibility of combining graphene with quantum dots to see if they couldn't overcome graphene's shortcomings. Instead of absorbing just 3% of the light that hits it, the graphene/quantum dot hybrid material is capable of absorbing 25% of the light falling on it.
A new tracer, 300 times more sensitive than those currently available, has been developed by researchers at the CEA, CNRS and the École Normale Supérieure de Lyon to detect and locate zinc using imaging methods.
The Organic Electronics Research Group at Linköping University (LiU) in Sweden, led by Professor Magnus Berggren, attracted great attention a year ago when Lars Herlogsson showed in his doctoral thesis that it was possible to construct fully functional field-effect transistors out of plastic. Kergoat, a post-doc in the same research group, now shows that transistors made of plastic can be controlled with great precision.
A RIKEN-led research team in Japan has now demonstrated the origin of magnetism in organic molecules.
Researchers at the University of California, San Diego Jacobs School of Engineering, USA, have developed a technique that enables metallic nanocrystals to self-assemble into larger, complex materials for next-generation antennas and lenses. The metal nanocrystals are cube-shaped and, like bricks or Tetris blocks, spontaneously organize themselves into larger-scale structures with precise orientations relative to one another.
University of Utah (US) physicists developed an inexpensive, highly accurate magnetic field sensor for scientific and possibly consumer uses based on a "spintronic" organic thin-film semiconductor that basically is "plastic paint."
In Physical Review Letters, Kwanpyo Kim and colleagues at the University of California, Berkeley, have cataloged the experimental Raman spectra of a series of graphene double layers where the top layer is rotated with respect to the bottom layer in one degree increments, up to a 30 degree mismatch.
Scientists and engineers at the University of Wisconsin-Milwaukee (UWM) have discovered an entirely new carbon-based material that is synthesized from graphene. The discovery, which the researchers are calling "Graphene Monoxide (GMO)," pushes carbon materials closer to ushering in next-generation electronics.
Researchers have found a condition that creates hydrogen faster without a loss in efficiency.
Researchers at MIT and Brigham and Women's Hospital have designed a cell-sorting microchip that takes advantage of this natural cell-rolling mechanism. The device takes in mixtures of cells, which flow through tiny channels coated with sticky molecules. Cells with specific receptors bind weakly to these molecules, rolling away from the rest of the flow, and out into a separate receptacle.
Researcher at Samsung Advanced Institute of Technology (Korea), and Columbia University (US) report on a three-terminal active device, a graphene variable-barrier "barristor" (GB), where the key is an atomically sharp interface between graphene and hydrogenated silicon.
Researchers at Johns Hopkins University (US) published their research on bioinspired nanofibers support chondrogenesis for articular cartilage repair in an article in PNAS.
Researchers at the NanoScience Center of the University of Jyväskylä, Finland, and at Harvard University, US, have discovered a novel way to make nanomaterials.
A new online, searchable database for materials used in nanotechnology is now available.
Dr. Lasse Makkonen, Principal Scientist at VTT Technical Research Centre of Finland, presented an explanation for the origin of sliding friction between solid objects. According to his theory, the amount of friction depends on the surface energy of the materials in question.
Researchers in Ireland have developed a new technology using materials called Bulk Metallic Glasses (BMG) to produce high-precision molds for making tiny plastic components.
The Institute for Print and Media Technology at Chemnitz University of Technology, Germany, presents printed loudspeakers on paper substrate.
Researchers from the Institute of Physical Chemistry of the Polish Academy of Sciences in Warsaw, and the Interdisciplinary Research Institute in Lille developed a low cost method for manufacturing multilayered graphene sheets. The new method does not require any specialized equipment and can be implemented in any laboratory.
Researcher at University of Michigan (US) and Instituto de Ciencia y Tecnologia de Polimeros (Spain) present in Advanced Materials versatile all-nanocomposite capped microcontainers.
Researchers at Ruhr-University Bochum (Germany), Stanford University (US), and SLAC National Accelerator Laboratory (US) demonstrate the novel concept of a "desalination battery", which operates by performing cycles in reverse on their previously reported mixing entropy battery. The desalination battery is comprised by a Na2-xMn5O10 nanorod positive electrode and Ag/AgCl negative electrode.
Researchers at Rice's Richard E. Smalley Institute for Nanoscale Science and Technology (US) have come up with a set of facts and figures about carbon nanotubes that appear to collapse during the growth process; they found that these unique configurations have properties of both nanotubes and graphene nanoribbons. The researchers at Rice University found that nanotubes of a large diameter can spontaneously collapse into closed-edge graphene nanoribbons when atoms on the inside wall get close enough to attract each other.
Yoshiyuki Miyamoto, Dynamic Process Simulation Group, the Nanosystem Research Institute of the National Institute of Advanced Industrial Science and Technology (AIST), has performed the first-principles simulations to show that an ultra-short laser pulse can induce electron excitation which activates synchronized rotational motion of two acetylene molecules encapsulated in a semiconducting carbon nanotube using the Earth Simulator of Japan Agency for Marine-Earth Science and Technology.
A new class of unconventional superconductors: Researchers at the Rutherford Appleton Laboratory and at the universities of Kent, Bristol and Huddersfield, in UK, have discovered a new class of very exotic unconventional superconductors, namely LaNiGa2.
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