IEEE Nanotechnology Council
Advancing Nanotech for Humanity
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NANO BLOG

June 20, 2015 – Nano Modeling and Simulation – IEEE NTC Technical Committee

The Modeling and Simulation technical committee focuses on topics associated with the formulation, development and use of theoretical models for the understanding and design of nanotechnological systems for engineering applications in a wide spectrum of human society. For this purpose, it addresses technical issues related to the development of numerical codes requiring basic software as well as large-scale computational resources such as density functional theory, tight binding methods, self-consistent Poisson-Schrödinger solver, Monte Carlo simulation, non-equilibrium green function techniques, molecular dynamics to name a few. Among the current and latest topics of investigation are modeling of nanoscale electronic and photonic devices and systems, advanced devices made of new low-dimensionality materials such as graphene and transition metal dichalcogenides, spintronic devices and bio-nanoelectronic devices for molecular manipulation and sensing.

nano pore

Schematic of a Graphene field effect membrane Transistor containing a nanopore for DNA sequencing (after

Anuj Girdhar, Chaitanya Sathe, Klaus Schulten and Jean-Pierre Leburton,  PNAS, 110 (42) pp.1648-1653 (2013))

(Submitted by Jean-Pierre Leburton, posted by Yonhua Tzeng)

 


June 10, 2015 – NIST’s ‘Nano-Raspberries’ Could Bear Fruit in Fuel Cells

Researchers at the National Institute of Standards and Technology (NIST) have developed a fast, simple process for making platinum “nano-raspberries”—microscopic clusters of nanoscale particles of the precious metal. The berry-like shape is significant because it has a high surface area, which is helpful in the design of catalysts. Even better news for industrial chemists: the researchers figured out when and why the berry clusters clump into larger bunches of “nano-grapes.”

NIST Platinum Resterberry

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May 9, 2015 – NIST-led Research Group Creates First Whispering Gallery for Graphene Electrons

Yue Zhao et al., an international team of scientists at the U.S. Commerce Department’s National Institute of Standards and Technology (NIST), demonstrated nanoscale whispering gallery electron resonance in graphene by using the probe voltage of a scanning tunneling microscope to create a circular pn junction in nanoscale area like a circular wall of mirrors to the electrons and similar to what happens to acoustic wave in the famous whispering gallery of St. Paul’s Cathedral.

“An electron that hits the step head-on can tunnel straight through it,” said NIST researcher Nikolai Zhitenev. “But if electrons hit it at an angle, their waves can be reflected and travel along the sides of the curved walls of the barrier until they began to interfere with one another, creating a nanoscale electronic whispering gallery mode.”

The potential of graphene-based quantum electronic resonators and lenses is believed to be huge.

Read the original press release and article: Center for Nanoscale Science and Technology/ NIST ; *Y. Zhao, J. Wyrick, F. Natterer, J. Rodriguez-Nieva, C. Lewandowski, K. Watanabe, T. Taniguchi, L. Levitov, N. Zhitenev, and J. Stroscio. Creating and probing electron whispering-gallery modes in graphene. Science. 8 May 2015: Vol. 348, no. 6235, pp. 672-675. DOI: 10.1126/science.aaa7469.

15CNST007_graphene_whispering_gallery_LR

credit: Jon Wyrick, CNST/NIST

(Recommended by Ed Perkins, posted by Yonhua Tzeng)

 

May 8, 2015 – Pathway to the Piezoelectronic Transduction Logic Device

P. M. Solomon et al. proposed a piezoelectronic transistor (PET) not subject to the voltage limits of field-effect transistors. The PET transduces voltage to stress, activating a facile insulator−metal transition, thereby achieving multi-gigahertz switching speeds, as predicted by modeling, at low power. The team demonstrated a stress-based transduction principle. Read the original article: Nano Lett. 2015, 15, 2391−2395.

piezoelectronics

(Posted by Yonhua Tzeng. Adapted with permission from Nano Lett. 2015, 15, 2391−2395, DOI: 10.1021/nl5046796 Copyright © 2015 American Chemical Society.)

May 8, 2015 – Flexible CMOS-like Logic Circuits Made of N-type Polymer Sorted Single-Wall Carbon Nanotube

Huiliang Wang et al. demonstrated flexible CMOS-like logic circuits made of ambipolar single-wall carbon nanotube transistors fabricated without needing for doping processes using high-mobility electron-accepting (n-type) polymer sorted semiconducting SWCNT. Read the original article: Huiliang Wang et al., Adv. Funct. Mater. 2015, 25, 1837–1844. DOI: 10.1002/adfm.201404126  (Posted by Yonhua Tzeng)

n-type polymer doped SWCNT for CMOS-like logic circuit