News from the NNI Community - Research Advances Funded by Agencies Participating in the NNI

A UCLA-led study reports on the first-ever determination of the 3D atomic structure of an amorphous solid—in this case, a material called metallic glass. Metallic glasses tend to be both stronger and more shapeable than standard crystalline metals, and they are used today in products ranging from electrical transformers to high-end golf clubs and the housings for Apple laptops, and other electronic devices. The researchers examined a sample of metallic glass about 8 nanometers in diameter, made of eight different metals.

Researchers from Penn State, Carnegie Mellon University, Northwestern University, New York University, and the National Institute of Standards and Technology have demonstrated that a technique that mimics the ancient Japanese art of kirigami may offer an easier way to fabricate complex 3D nanostructures for use in electronics, manufacturing, and health care. 3D nanostructures are difficult to make because current nanofabrication processes are used to fabricate microelectronics, which rely on flat films. When cuts are introduced to a film and forces are applied in a certain direction, a structure pops up, similar to when a kirigami artist applies force to a cut paper. The geometry of the planar pattern of cuts determines the shape of the 3D architecture.

Researchers from Penn State, Carnegie Mellon University, Northwestern University, New York University, and the National Institute of Standards and Technology have demonstrated that a technique that mimics the ancient Japanese art of kirigami may offer an easier way to fabricate complex 3D nanostructures for use in electronics, manufacturing, and health care. 3D nanostructures are difficult to make because current nanofabrication processes are used to fabricate microelectronics, which rely on flat films. When cuts are introduced to a film and forces are applied in a certain direction, a structure pops up, similar to when a kirigami artist applies force to a cut paper. The geometry of the planar pattern of cuts determines the shape of the 3D architecture. 

A team of researchers from the U.S. Department of Energy’s Lawrence Berkeley National Laboratory and the University of California, Berkeley, has developed an atomically thin sensor that can detect ultralow concentrations of nitrogen dioxide of at least 50 parts per billion. The sensor, which is constructed from a monolayer alloy of rhenium niobium disulfide, works at room temperature and consumes less power than conventional sensors. Also, unlike other 2D devices, the new sensor electrically responds selectively to nitrogen dioxide molecules, with minimal response to other toxic gases, such as ammonia and formaldehyde. 

Scientists at Rice University have optimized a process to convert waste from rubber tires into graphene, which can be used to strengthen concrete. The process was introduced in 2020 by the same scientists and has been used to convert food waste and plastic into graphene by exposing them to a jolt of electricity, which removes everything but carbon atoms from the sample. Those atoms then reassemble into graphene. This time, the scientists applied the process to tire-derived carbon black and found that about 70% of the material converted to graphene.

A team of U.S. and European researchers has developed an elegant method for producing individual, continuous chains of palladium ions. The process is based on self-organized assembly of a special palladium complex and single-stranded DNA molecules (which are becoming an important tool for nanoscience and nanotechnology). The incorporation of metals in DNA structures can give them properties such as conductivity, catalytic activity, magnetism, and photoactivity. But organizing metal ions in DNA molecules is not easy. So, the researchers used a specially constructed palladium complex that can form base pairs with natural adenine bases in a strand of DNA.

Researchers at the U.S. Department of Energy's Los Alamos National Laboratory have developed a new class of quantum dots that deliver a stable stream of single, spectrally tunable infrared photons under ambient conditions and at room temperature, unlike other single-photon emitters. This discovery opens a range of practical applications, including quantum communication, quantum metrology, medical imaging and diagnostics, and clandestine labeling.

Researchers from North Carolina State University and the Leibniz Institute for New Materials in Germany have demonstrated that stretching shape-memory polymers embedded with clusters of gold nanoparticles alters their plasmon coupling, giving rise to desirable optical properties. One potential application for the material is a sensor that relies on optical properties to track an object or environment's thermal history. An important application of thermal-history sensors is assuring the quality or safety of shipping or storing materials that are sensitive to significant changes in heat.

An international team of researchers has developed a way to harvest energy from radio waves to power wearable devices. The system consists of two stretchable metal antennas integrated onto a conductive graphene material with a metal coating. This system is connected to a stretchable rectifying circuit, creating a rectified antenna, or "rectenna," capable of converting energy from electromagnetic waves into electricity. This electricity can then be used to power wireless devices or to charge energy storage devices, such as batteries and supercapacitors.

Bright semiconductor nanocrystals known as quantum dots give QLED TV screens their vibrant colors. But attempts to increase the intensity of that light generate heat instead, reducing the quantum dots' light-producing efficiency. A new study by scientists at the U.S. Department of Energy's SLAC National Accelerator Laboratory explains why, and the results have broad implications for developing future quantum and photonics technologies, in which light replaces electrons in computers and fluids in refrigerators.