A team of UCLA, Caltech and Ford Motor Company researchers has improved fuel-cell technologies to exceed the U.S. Department of Energy targets in efficiency, stability and power. No other reported fuel cells have reached all these milestones simultaneously.
Researchers at University of California, Los Angeles, have recently devised an approach that could enable the development of programmable devices made of 2-D semiconductors. This approach, presented in the paper published in Nature Electronics, leverages a superionic phase transition in silver iodide to tailor the carrier type within devices made of WSe2 via a process called switchable ionic doping.
A new electrode material could make it possible to construct lithium-ion batteries with a high charging rate and storage capacity. If scaled up, the anode material developed by researchers at the University of Science and Technology of China (USTC) and colleagues in the US might be used to manufacture batteries with an energy density of more than 350 watt-hours per kilogram – enough for a typical electric vehicle (EV) to travel 600 miles on a single charge.
Transparent electrical conductors are useful, e.g., in solar cells, sensors, displays, or smart windows. Indium tin oxide (ITO) thin films are commonly used for such applications, but the material is brittle and can crack under mechanical stress. Thin films made from silver nanowires are a possible alternative as a flexible, transparent conductor. However, their conductivity is reduced by polyvinylpyrrolidone (PVP) ligands that are used during nanowire synthesis and remain on the surface.
Chosen from a pool of 343 nominated promising scientific researchers aged 42 years and younger from America’s top academic and research institutions, Duan is one of ten Physical Sciences & Engineering finalists. The finalists were selected based on their extraordinary accomplishments and their promise for the future.
Titled “Van der Waals Integration Before and Beyond Two-dimensional Materials”, the article was published in the March 20, 2019 issue of the journal.
As a UCLA professor of chemistry and biochemistry, Prof. Duan is also an Associate Editor for the journalNano Research. In 2018, Duan was named one of the most influential scientific researchers by Clarivate Analytics.
A new mechanically strong, double-pane ceramic aerogel made from hexagonal boron nitride that is resistant to high temperatures could be used in aerospace and industrial applications. The material, which boasts both a negative Poisson’s ratio and a negative thermal expansion coefficient, is very different to typical ceramic aerogels that are brittle and structurally degrade under thermal shocks.
Six faculty members from UCLA have been selected as 2018 fellows of the American Association for the Advancement of Science. They are to be honored by the association for their scientifically or socially distinguished efforts to advance science or its applications.
Researchers at the University of California, Los Angeles (UCLA), the University of Texas at Austin, and Hunan University (China) have recently devised a new method of preparing highly uniform, solution-processable, phase-pure semiconducting nanosheets. Their approach, outlined in a paper published in Nature, involves the electrochemical intercalation of quaternary ammonium molecules into 2-D crystals, followed by a mild sonication and exfoliation process.
The team reported on a new on-chip "tool" that helps to "see" & identify the key process that hinders the performance of catalyst used in fuel cells. The tool will help scientists find respective solutions more efficiently.
The work was led by Xiangfeng Duan, a UCLA professor of chemistry and biochemistry, and Yu Huang, a UCLA professor of materials science and engineering.
The lead author of the study is Mengning Ding (pictured right), a former UCLA CNSI postdoctoral fellow advised by Huang and Duan, now a professor of chemistry at Nanjing University, China. Other study authors are UCLA graduate students and postdoctoral researchers in Duan and Huang’s research groups and researchers from King Saud University, Saudi Arabia.
Chosen from a pool of 286 nominated promising scientific researchers aged 42 years and younger from America’s top academic and research institutions, Duan is one of 11 Physical Sciences & Engineering finalists and Garg is one of ten Chemistry finalists. The finalists were selected based on their extraordinary accomplishments and their promise for the future.
UCLA scientists and engineers have developed a new process for assembling semiconductor devices. The advance could lead to much more energy-efficient transistors for electronics and computer chips, diodes for solar cells and light-emitting diodes, and other semiconductor-based devices.
Thirty UCLA faculty members are among the most influential researchers in their fields for 2017, as determined by Claritive Analytics. The organization compiled its 2017 Highly Cited Researchers list of more than 3,000 scientists from around the world whose studies were among the top 1 percent most referenced in studies from their field. (Read more about the rankings methodology.)
A research team led by UCLA scientists and engineers has developed a method to make new kinds of artificial “superlattices” — materials comprised of alternating layers of ultra-thin “two-dimensional” sheets, which are only one or a few atoms thick. Unlike current state-of-the art superlattices, in which alternating layers have similar atomic structures, and thus similar electronic properties, these alternating layers can have radically different structures, properties and functions, something not previously available.
Researchers in the US and Saudi Arabia are the first to have observed negative transconductance (NTC) inside multilayer molybdenum-disulphide (MoS2) transistors with optimized graphene/metal hybrid contacts. The NTC behaviour comes about thanks to competition between inter-layer charge transport and charge transport through a vertical potential barrier in the MoS2. This unique effect could be exploited for making frequency doublers and phase-shift keying circuits with only one multilayer transistor – something that would greatly simplify circuit design compared to conventional technology, says the team.