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We demonstrate that the electronic devices built on patterned graphene nanoribbons (GNRs) can be made with atomic-perfect-interface junctions and controlled doping via manipulation of edge terminations. Using first-principles transport calculations, we show that the GNR field effect transistors can achieve high performance levels similar to those made from(More)
Jian Wu, Ji Zang, Brian Larade, Hong Guo, X. G. Gong, and Feng Liu,* Center for Advanced Study, Tsinghua University, Beijing 100084, People’s Republic of China Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, USA Department of Physics, McGill University, Montreal, Canada PQ H3A 2T8 Department of Physics, Fudan(More)
We demonstrate, by theoretical analysis and molecular dynamics simulation, a mechanism for fabricating nanotubes by self-bending of nanofilms under intrinsic surface-stress imbalance due to surface reconstruction. A freestanding Si nanofilm may spontaneously bend itself into a nanotube without external stress load, and a bilayer SiGe nanofilm may bend into(More)
We demonstrate that when a single-walled carbon nanotube is under pressure it undergoes a series of shape transitions, first transforming from a circle to an oval and then from an oval to a peanut. Most remarkably, the ratio of the area of the tube cross sections at the second transition over that at the first transition appears as a constant, independent(More)
We investigate the bending of nanometer thick Si cantilevers induced by chemisorption of H atoms and acetylene molecules, using atomistic simulations and continuum theories. We show that the bending curvature of Si nanocantilevers does not follow the classical Stoney formula, but agrees well with a modified Stoney formula that we have derived. Our studies(More)
<lb>The vibrational property and Raman spectra of hydrogen-free and hydrogen -terminated carbon nanoribbons<lb>(CNRs) have been systematically studied by the density functional theory in the local density approximation.<lb>We have calculated two types of CNRs, i.e., the armchair CNR (ACNR) and the zigzag one (ZCNR). It is<lb>found that for all CNRs there(More)
We investigate the structural and mechanical properties of single-walled carbon nanotubes (SWNTs) under hydrostatic pressure, using constant-pressuremolecular dynamics (MD) simulations. We observed that all the SWNTs, independent of their size and chirality, behave like a classical elastic ring exhibiting a buckling transition transforming their(More)
Bending of thin sheets or ribbons is a ubiquitous phenomenon that impacts our daily lives, from the household thermostat to sensors in airbags. At nanometer-scale thicknesses, the mechanics responsible for bending and other distortions in sheets can be employed to create a nanofabrication approach leading to novel nanostructures. The process and resulting(More)
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