A new method for controllably constructing precise inter-nanotube junctions and structures in carbon nanotube (CNT) arrays, Northeastern Univ. researchers say, is facile and easily scalable. It will allow them to tailor the physical properties of nanotube networks for use in applications ranging from electronic devices to CNT-reinforced composite materials found in everything from cars to sports equipment.
The very idea of fibers made of carbon nanotubes is neat, but Rice Univ. scientists are making them neat—literally. The single-walled carbon nanotubes in new fibers created at Rice line up like a fistful of uncooked spaghetti through a process designed by chemist Angel Martí and his colleagues.
As integrated circuits become increasingly miniaturized and the sizes of magnetic components approach nanoscale dimensions, magnetic properties can disappear. Scientists in Japan, with the help of a form of electron microscopy called split-illumination electron holography, have gained important insights into the development of stable, strong nanomagnets by discovering magnetism-amplifying atomic disorder in iron-aluminum alloys.
The ideal energy or information storage system is one that can charge and discharge quickly, has a high capacity and can last forever. Nanomaterials are promising to achieve these criteria, but scientists are just beginning to understand their challenging mechanisms. Now, a team from Stanford Univ. has provided new insight into the storage mechanism of nanomaterials that could facilitate development of improved batteries and memory devices.
When moving through a conductive material in an electric field, electrons tend to follow the path of least resistance—which runs in the direction of that field. But now physicists have found an unexpectedly different behavior under very specialized conditions—one that might lead to new types of transistors and electronic circuits that could prove highly energy efficient.
For detecting cancer, manual breast exams seem low-tech compared to other methods such as MRI. But scientists are now developing an “electronic skin” that “feels” and images small lumps that fingers can miss. Knowing the size and shape of a lump could allow for earlier identification of breast cancer, which could save lives.
Artificial membranes mimicking those found in living organisms have many potential applications ranging from detecting bacterial contaminants in food to toxic pollution in the environment to dangerous diseases in people. Now a group of scientists in Chile has developed a way to create these delicate, ultra-thin constructs through a "dry" process, by evaporating two commercial, off-the-shelf chemicals onto silicon surfaces.
Scientists have married two unconventional forms of carbon to make a molecule that conducts electricity in only one direction. This tiny electronic component, known as a rectifier, could play a key role in shrinking chip components down to the size of molecules to enable faster, more powerful devices.
When it comes to diesel engine catalysts, which are responsible for cleansing exhaust fumes, platinum has unfortunately proved to be the only viable option. This has resulted in material costs alone accounting for half of the price of a diesel catalyst. Researchers in Denmark say they have developed a new way to manufacture catalysts that may result in a 25% reduction in the use of platinum.
Typically a highly conductive material, graphene becomes a semiconductor when prepared as an ultra-narrow ribbon. Recent research has now developed a new method to selectively dope graphene molecules with nitrogen atoms. By seamlessly stringing together doped and undoped graphene pieces, ”heterojunctions” are formed in the nanoribbons, allowing electric current to flow in only one direction when voltage is applied.
New research at the Univ. of Maryland could lead to a generation of light detectors that can see below the surface of bodies, walls and other objects. Using the special properties of graphene, a prototype detector is able to see an extraordinarily broad band of wavelengths. Included in this range are terahertz waves, which are invisible to the human eye.
Defects damage the ideal properties of many 2-D materials, like carbon-based graphene. Phosphorus just shrugs. That makes it a promising candidate for nanoelectronic applications that require stable properties, according to new research by Rice Univ. theoretical physicist Boris Yakobson and his colleagues.
Nearly 20 years ago researcher Alex Zettl of the Lawrence Berkeley National Laboratory synthesized in his laboratory a new material never before seen by nature: boron nitride nanotubes, the strongest, lightest, most thermally conducting and most chemically resistant fiber known to exist. Now a startup has licensed this technology with the aim of manufacturing boron nitride nanotubes for commercial use.
Materials made from nanoparticles hold promise for myriad applications. The challenge in creating these wonder materials is organizing the nanoparticles into orderly arrangements. Nanoparticles of magnetite, the most abundant magnetic material on earth, are found in living organisms from bacteria to birds. Nanocrystals of magnetite self-assemble into fine compass needles in the organism that help it to navigate.
A new atomically thin 2-D ultrasensitive semiconductor material developed by researchers California promises to push the boundaries of biosensing technology toward single-molecule detection. Based on molybdenum disulfide or molybdenite, the biosensor material which is used commonly as a dry lubricant, surpasses graphene’s already high sensitivity, offers better scalability and lends itself to high-volume manufacturing.
Lighter, more flexible and cheaper than conventional solar-cell materials, carbon nanotubes (CNTs) have long shown promise for photovoltaics. But research stalled when CNTs proved to be inefficient, converting far less sunlight into power than other methods. Now a research team has created a new type of CNT solar cell that is twice as efficient as its predecessors.
When metallic lithium forms and deposits during the charging process in a lithium-ion battery, it can lead to a reduced battery lifespan and even short circuits. Using neutron beams, scientists have now peered into the inner workings of a functioning battery without destroying it. In the process, they have resolved this so-called lithium plating mystery.
Scientists have tapped oil and water to create scaffolds of self-assembling, synthetic proteins called peptoid nanosheets that mimic complex biological mechanisms and processes. The accomplishmentis expected to fuel an alternative design of the 2-D peptoid nanosheets that can be used in a broad range of applications. Among them could be improved chemical sensors and separators, and safer, more effective drug delivery vehicles.
A team of researchers in the U.S. and China have developed a new sensor that can detect and count nanoparticles, at sizes as small as 10 nm, one at a time. The researchers say the sensor, which is a Raman microlaser sensor in a silicon dioxide chip that does not need rare-earth ions to achieve high resolution, could potentially detect much smaller particles, viruses and small molecules.
Scientists at Oak Ridge National Laboratory have discovered they can control chemical reactions in a new way by creating different shapes of cerium oxide, a rare-earth-based catalyst. Their finding holds potential for refining fuels, decreasing vehicle emissions, producing commodity chemicals and advancing fuel cells and chemical sensors.
Many common materials exhibit different and potentially useful characteristics when fabricated at extremely small scales. But lack of knowledge of how to retain nanoscale properties in materials at larger scales and lack of assembly capabilities for items have prevented us from taking advantage of these nanoscale characteristics. DARPA has created the Atoms to Product (A2P) program to help overcome these challenges.
Recent experiments have confirmed that a technique developed several years ago at NIST can enable optical microscopes to measure the 3-D shape of objects at nanometer-scale resolution—far below the normal resolution limit for optical microscopy (about 250 nm for green light). The results could make the technique a useful quality control tool in the manufacture of nanoscale devices such as next-generation microchips.
Scientists in The Netherlands have demonstrated that they can detect extremely small changes in position and forces on very small drums of graphene. Graphene drums have great potential to be used as sensors in devices such as mobile phones. Using their unique mechanical properties, these drums could also act as memory chips in a quantum computer.
A new argument has just been added to the growing case for graphene being bumped off its pedestal as the next big thing in the high-tech world by the 2-D semiconductors known as MX2 materials. An international collaboration of researchers led by Lawrence Berkeley National Laboratory has reported the first experimental observation of ultrafast charge transfer in photo-excited MX2 materials.
By combining plasmonics and optical microresonators, researchers at the Univ. of Illinois at Urbana-Champaign have created a new optical amplifier (or laser) design, paving the way for power-on-a-chip applications. The speed of currently available semiconductor electronics is limited to about 10 GHz due to heat generation and interconnects delay time issues.