Mechanical Engineering: Research Guide

Electrical interconnects may very well be the unsung heroes of modern microchips. These tiny wires—typically made of copper due to its high conductivity—string together the billions of transistors that drive our computers and electronic devices. But as the technology advances and additional transistors are piled on, the components must shrink to the nanoscale. And that's when copper begins to fail.

University of Arizona researchers have demonstrated a promising new application for graphene nanoribbons, a nanoscale semiconductor material with the potential to withstand extreme environments. The team's findings could help clear a key hurdle to bringing fusion energy to the electric grid.

Some researchers are leaning into biology for inspiration in computing. In particular, neuromorphic computing offers a brain-inspired approach to hardware that replaces traditional binary processing with systems that function more like neurons and synapses. Now, a new study, published in Nature Communications, describes an innovative design for a fluidic memristor that uses its own self-heating mechanism to induce a history-dependent memory effect.

Many of the advanced electronic components surrounding us in everyday life rely on polar materials to function. Polar materials have an uneven distribution of electric charge. This gives them a positive and a negative side even in the absence of an external electric field. The most important among these are ferroelectric materials, in which the direction of polarization can be reversed by applying an electric field.

Nanocrystals are so useful that they formed the basis of the 2023 Nobel Prize in Chemistry. But despite their usefulness, scientists have so far been able to make these microscopic crystals from only a limited palette of materials. A group of chemists at the University of Chicago and Argonne National Laboratory has announced a way to make nanocrystals from a useful class of materials known as metal nitrides—a previously impossible task.

Researchers have shown it is possible to expand the field of twistronics—literally. They have demonstrated a technique that allows them to fabricate oxide twistronic materials at much larger scales while also controlling the twist angles between materials that dictate their structural and electronic properties.

Researchers at the College of Design and Engineering at the National University of Singapore have identified a key design principle for building reliable electronics from materials only one atomic layer thick, giving engineers a clearer way to control unwanted electrical leakage in future ultra-small devices.

Driving an electric current through a molecule can create a magnetic field. Yet in practice, such fields are often too weak to be detected experimentally. Through theoretical modeling, researchers at the Institute of Science and Technology Austria (ISTA) show how quantum effects can turn single molecules into effective magnets—including one shaped like a microscopic soccer ball, just in time for the FIFA World Cup final. The findings are published in Nature Communications.

Scientists have unveiled a new fabrication technique for the ultra-clean manufacturing of 2D heterostructures—materials just a few atoms thick—that could be used in quantum technology and electronics. Experts from Southampton and Singapore say the method could be used to develop next-generation devices that accelerate research in quantum computing.

A research team led by Seil Kim of the Korea Institute of Materials Science (KIMS) Energy & Environmental Materials Research Division has developed an Ag–PTFE composite plating technology that produces silver coatings with greater hardness and wear resistance than conventional silver plating by stably dispersing PTFE nanoparticles in a cyanide-free acidic silver plating bath.

As computer chips become more powerful and compact, the materials that protect them must perform better than ever. In advanced chip packaging, liquid epoxy is widely used because it can flow into tiny spaces before curing into a solid protective layer. To be effective, the material must be easy to process in its liquid state while becoming strong, stable and reliable after curing.

Researchers at Nagoya University in Japan have developed a method to form dome-shaped bumps on nanofilms in water using a computer-guided electron beam. The bumps form within 10 seconds and can be flattened, reshaped or repositioned as needed.

Materials with magnetic nanostructures have a wide range of potential applications. One area is so-called spintronics, with devices that encode information in magnetic domains. These magnetic bits can be written, read and erased in a more energy-efficient way than bits in current semiconductor devices. Spin textures and magnetic domains in such materials can be investigated using nanoscale magnetic imaging techniques. For example, photoemission electron microscopy (PEEM), coupled with a magnetically sensitive detection mechanism.

Nanocrystals are already used in millions of devices, including televisions, laptops and displays, and are considered key materials for the next generation of quantum, sensing and solar technologies. However, they have not yet fully realized their potential. One major reason is their inherent heterogeneity: A single solution contains billions of nanocrystals whose properties can differ substantially. Although these particles can be characterized, important quality parameters are typically accessible only as average values across the entire sample.

Fast identification of bacteria is important in health care, food safety, environmental monitoring and infection control. One of the most common first steps is gram classification, which separates bacteria into gram-positive and gram-negative groups. This information can help guide early treatment decisions and safety responses. However, conventional Gram staining requires several chemical steps, trained personnel and manual interpretation.

A joint research group from Tohoku University, Tokyo University of Science, Tokyo Metropolitan University and the Japan Fine Ceramics Center has developed a thermal catalyst that exhibits high carbon monoxide (CO) oxidation activity under low-temperature conditions.

A new Tufts University imaging facility is doing something that most microscopy centers in the world cannot: allowing scientists to examine a butterfly wing, a living tissue or a microchip and reveal its physical structure, molecular chemistry and elemental composition across every scale, from the macroscale down to the nanoscale—all in one imaging session.

Researchers at Nagoya University in Japan have developed gallium-doped zinc oxide (GZO) nanosheets that may enhance camera resolution in compact devices, including smartphones and medical endoscopes.

Researchers at the University of Tokyo and the Innovation Center of NanoMedicine (iCONM) have developed an artificial intelligence (AI) approach that identifies the morphology of nanoparticles in liquid using data from standard nanoparticle tracking analysis (NTA), a widely used technique for particle sizing. The method achieved classification accuracies exceeding 80% for non-spherical nanoparticles without requiring modification of existing instruments.

Light can carry enormous amounts of information at extreme speeds, making photonic technologies promising for the development of faster communications, more powerful computing systems and more sensitive sensors. But for light to be useful for these purposes, engineers need to be able to control where it goes and redirect it quickly. A new device built by Caltech researchers uses a beam of light to steer another to a different angle in just 74 femtoseconds (74 quadrillionths of a second). That's about the time it takes light to travel the width of a human hair.

Next-generation batteries that use new electrolyte materials could achieve far higher energy density than today's lithium-ion batteries, without many of the safety concerns. But advanced batteries, such as those that use solid or almost-solid electrolytes, have been plagued by the formation of tiny spikes of lithium metal called dendrites that cause the batteries to lose efficiency and fail.

Researchers in the Texas A&M University J. Mike Walker '66 Department of Mechanical Engineering have developed a new method for producing graphene oxide, a high-value carbon nanomaterial used in batteries, electronics and advanced manufacturing.

New research has revealed that water behaves differently when confined to spaces just one molecule thick. For the first time, scientists have directly measured the vibrational signatures of truly two-dimensional water. In a study published in Nature Communications, researchers used ultrathin channels only a few angstroms high to trap water in isolated layers and probe how its hydrogen-bonding network changes under extreme confinement.

Achieving the blackest of blacks has been one of humanity's enduring challenges. It is a frontier that unites modern nanotechnologists with nature's ancient color palette.

Phase transformations—in which a material changes from one crystal structure to another, thereby acquiring dramatically different properties—are ubiquitous in nature. Understanding the microscopic mechanisms of these transformations is essential for controlling material properties and designing functional devices.

A newly developed framework for understanding the photoproperties of both natural organic matter and eumelanin, a natural pigment responsible for dark colors in organisms, may inspire advanced sustainable technologies, scientists say.

Two-dimensional (2D) perovskites are increasingly recognized as promising candidate materials for the next generation of optoelectronic devices. These materials combine key characteristics of both 2D semiconductors and three-dimensional (3D) perovskites.

Due to their high porosity, metal-organic frameworks (MOFs) are regarded as promising materials for innovative applications, which is why the Nobel Prize in Chemistry was awarded in 2025 for their discovery. They are used, for example, to store gases, to capture CO2 and for the targeted delivery of medicines.

Carbon materials, such as carbon fibers and activated carbons, are essential across a wide variety of fields, encompassing everything from aerospace engineering to fuel cells and thermal insulation. For decades, Raman, infrared and X-ray photoelectron spectroscopy (XPS) have been the primary tools used to analyze carbon materials. However, because of their diverse structural conditions and inconsistencies in their interpretation, researchers have found it challenging to assign specific spectral peaks to exact, localized chemical structures.

The growing use of renewable energy sources, such as solar and wind power, requires energy storage systems that can charge quickly, deliver power efficiently and remain stable over long-term use. Batteries can store large amounts of energy, but they often take longer to charge.