Duan Research Group

Hetero-integrated Nanostructures and Nanodevices

News

  • 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. 

    From www.chemistry.ucla.edu

  • 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.

    From newsroom.ucla.edu

  • 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.)

    From http://newsroom.ucla.edu/

  • 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.

    From http://newsroom.ucla.edu

  • 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.

    From nanotechweb.org

  • An international team led by researchers at UCLA and Caltech has demonstrated how altering the form of platinum nanoscale wires from a smooth surface to a jagged one could dramatically reduce the amount of precious metal used as catalysts in fuel cells and lower the cost.

    From newsroom.ucla.edu

  • Researchers at UCLA’s California NanoSystems Institute have developed a dramatically advanced tool for analyzing how chemicals called nanocatalysts convert chemical reactions into electricity. Current spectroscopy methods require large laboratory machines to measure chemical reactions, but the new technique uses a nanoelectronic chip to do the same thing while the reactions are taking place — which previously was very difficult — with better accuracy, and while gathering a completely new set of data.

    From newsroom.ucla.edu

  • Electrodes containing porous graphene and a niobia composite could help improve electrochemical energy storage in batteries. This is the new finding from researchers at the University of California at Los Angeles who say that the nanopores in the carbon material facilitate charge transport in a battery. By fine tuning the size of these pores, they can not only optimize this charge transport but also increase the amount of active material in the device, which is an important step forward towards practical applications.

    From nanotechweb.org

  • Researchers at the University of California, Los Angeles, have succeeded in minimizing both the contact resistance and channel length in transistors made from the 2D semiconductor molybdenum disulphide, so making a device that has a high ON current of 0.83 mA/µm at 300K. This new work shows for the first time that 2D semiconducting transistors can compete with silicon-based ones in terms of performance – as defined by the International Technology Roadmap for Semiconductors (ITRS).

    From nanotechweb.org

  • Researchers in China and the US have unveiled the first nanoscale amplifier for light at the technologically important telecommunications wavelength of 1.55 µm (or the near-infrared). The new device, which is 20 times more powerful than previous such amplifiers that measured microns across, is small enough to fit on an integrated circuit. This means that it could help make for the next generation of faster, more efficient, nanophotonics components. [via nanotechweb and APS]

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UCLA, Department of Chemistry and Biochemistry
607 Charles E. Young Drive East, Box 951569
Los Angeles, CA 90095-1569
E-mail: xduan@chem.ucla.edu