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Physicists promise a copper revolution in nanophotonics: Researchers have for the first time experimentally demonstrated that copper nanophotonic components can operate successfully in photonic devices
Researchers from the Moscow Institute of Physics and Technology (MIPT) have for the first time experimentally demonstrated that copper nanophotonic components can operate successfully in photonic devi...
IBS team suppresses oxidative stress and neuronal death associated with Alzheimer's disease: The Center for Nanoparticle Research designs mitochondria-specific ceria nanoparticles (CeO2 NP) capable of suppressing neuronal cell death in test subjects
The brain is an enormous network of communication, containing over 100 billion nerve cells, or neurons, with branches that connect at more than 100 trillion points. They are constantly sending signals...
Graphene, a modified form of carbon, offers versatile potential for use in coating machine components and in the field of electronic switches. An international team of researchers led by physicists at...
A new way to use the chemical reactions of certain enzymes to trigger self-powered mechanical movement has been developed by a team of researchers at Penn State University and the University of Pittsb...
Just as the single-crystal silicon wafer forever changed the nature of communication 60 years ago, a group of Cornell researchers is hoping its work with quantum dot solids - crystals made out of crys...
New molecular property may mean more efficient solar and opto-electronic devices: Unexpected property in organic semiconductor molecule could lead to more efficient and cost-effective materials for cell phone and laptop displays
Chemists and polymer scientists collaborating at the University of Massachusetts Amherst report in Nature Communications this week that they have for the first time identified an unexpected property i...
Iranian researchers used natural and cheap raw materials to produce special nanocomposites applicable in energy, electronics and computer fields.
Hiden are exhibiting their latest laboratory gas analysers at Pittcon 2016, 6th - 10th March, Atlanta GA, USA, where Hiden will feature their latest HPR-20 systems for direct real time analysis, quant...
Researchers have developed a new way to improve the optical and electronic properties of the semiconducting material via 3D nanostructuring.
Strem Chemicals and SONA Nanotech Sign Distribution Agreement for the Worlds First Gold Nanorods Synthesized without CTAB
Strem Chemicals, Inc., a manufacturer of specialty chemicals for research and development, and SONA Nanotech Ltd. (SONA), a manufacturer of gold nanoparticles, today announced the signing of a distrib...
Scientists at the University of Michigan have found evidence that some carbon nanomaterials can enter into immune cell membranes, seemingly going undetected by the cell's built-in mechanisms for engu...
FLEXcon Shares Insights on Developments and Safety Guidelines in Nanotechnology - Business Wire (press release)
FLEXcon Shares Insights on Developments and Safety Guidelines in NanotechnologyBusiness Wire (press release)The event brought together members of NENA, an association committed to sharing information, energy, and ideas for fostering nanotechnology innovation, commercialization and economic prosperity to benefit both the people and environment of New ...and more »
Two MIT researchers have developed a thin-film material whose phase and electrical properties can be switched between metallic and semiconducting simply by applying a small voltage. The material then stays in its new configuration until switched back by another voltage. The discovery could pave the way for a new kind of “nonvolatile” computer memory chip that retains information when the power is switched off, and for energy conversion and catalytic applications. The findings, reported in the journal Nano Letters in a paper by MIT materials science graduate student Qiyang Lu and associate professor Bilge Yildiz, involve a thin-film material called a strontium cobaltite, or SrCoOx. Usually, Yildiz says, the structural phase of a material is controlled by its composition, temperature, and pressure. “Here for the first time,” she says, “we demonstrate that electrical bias can induce a phase transition in the material. And in fact we achieved this by changing the oxygen content in SrCoOx.” “It has two different structures that depend on how many oxygen atoms per unit cell it contains, and these two structures have quite different properties,” Lu explains. One of these configurations of the molecular structure is called perovskite, and the other is called brownmillerite. When more oxygen is present, it forms the tightly-enclosed, cage-like crystal structure of perovskite, whereas a lower concentration of oxygen produces the more open structure of brownmillerite. The two forms have very different chemical, electrical, magnetic, and physical properties, and Lu and Yildiz found that the material can be flipped between the two forms with the application of a very tiny amount of voltage — just 30 millivolts (0.03 volts). And, once changed, the new configuration remains stable until it is flipped back by a second application of voltage. Strontium cobaltites are just one example of a class of materials known as transition metal oxides, which is considered promising for a variety of applications including electrodes in fuel cells, membranes that allow oxygen to pass through for gas separation, and electronic devices such as memristors — a form of nonvolatile, ultrafast, and energy-efficient memory device. The ability to trigger such a phase change through the use of just a tiny voltage could open up many uses for these materials, the researchers say. Previous work with strontium cobaltites relied on changes in the oxygen concentration in the surrounding gas atmosphere to control which of the two forms the material would take, but that is inherently a much slower and more difficult process to control, Lu says. “So our idea was, don’t change the atmosphere, just apply a voltage.” “Voltage modifies the effective oxygen pressure that the material faces,” Yildiz adds. To make that possible, the researchers deposited a very thin film of the material (the brownmillerite phase) onto a substrate, for which they used yttrium-stabilized zirconia. In that setup, applying a voltage drives oxygen atoms into the material. Applying the opposite voltage has the reverse effect. To observe and demonstrate that the material did indeed go through this phase transition when the voltage was applied, the team used a technique called in-situ X-ray diffraction at MIT’s Center for Materials Science and Engineering. The basic principle of switching this material between the two phases by altering the gas pressure and temperature in the environment was developed within the last year by scientists at Oak Ridge National Laboratory. “While interesting, this is not a practical means for controlling device properties in use,” says Yildiz. With their current work, the MIT researchers have enabled the control of the phase and electrical properties of this class of materials in a practical way, by applying an electrical charge. In addition to memory devices, the material could ultimately find applications in fuel cells and electrodes for lithium ion batteries, Lu says. “Our work has fundamental contributions by introducing electrical bias as a way to control the phase of an active material, and by laying the basic scientific groundwork for such novel energy and information processing devices,” Yildiz adds. In ongoing research, the team is working to better understand the electronic properties of the material in its different structures, and to extend this approach to other oxides of interest for memory and energy applications, in collaboration with MIT professor Harry Tuller. José Santiso, the nanomaterials growth division leader at the Catalan Institute of Nanoscience and Nanotechnology in Barcelona, Spain, who was not involved in this research, calls it “a very significant contribution” to the study of this interesting class of materials, and says “it paves the way for the application of these materials both in solid state electrochemical devices for the efficient conversion of energy or oxygen storage, as well as in possible applications in a new kind of memory devices.” The work was supported by the National Science Foundation.
Two simple room-temperature and solution-based chemical processes are used to realize a new class of silver nano-network-based devices.
Nature Nanotechnology, an online manual, has published a report outlining the concept of combining nanoparticles with molecular and photodynamic therapies in order to deliver anticancer treatment, and...
Carbon sheet could be used as an ultrasmooth coating in machine components, so drastically reducing energy losses.
Physicists have discovered a new way to control and guide electrons in graphene by removing a single carbon atom from its perfect honeycombed lattice.
A WSe2(1–x)S2x field-effect transistor has promising tunable electrical properties that are undamaged after three months' exposure to air.