科研成果 by Year: 2011

2011
Wei X, Golberg D, Chen Q, Bando Y, Peng LM. Phonon-Assisted Electron Emission from Individual Carbon Nanotubes. Nano Letters. 2011;11:734-739. SCI被引用次数:30.
Wei X, Wang M-S, Bando Y, Golberg D. Thermal stability of carbon nanotubes probed by anchored tungsten nanoparticles. Science and Technology of Advanced Materials. 2011;12. SCI被引用次数:31.
Wei XL, Wang MS, Bando Y, Golberg D. Electron-Beam-Induced Substitutional Carbon Doping of Boron Nitride Nanosheets, Nanoribbons, and Nanotubes. Acs Nano [Internet]. 2011;5:2916-2922. 访问链接Abstract SCI被引用次数:229.
Substitutional carbon doping of the honeycomb-like boron nitride (BN) lattices in two-dimensional (nanosheets) and one-dimensional,(nanoribbons and nanotubes) nanostructures was achieved via in situ electron beam irradiation in an energy-filtering 300 kV high-resolution transmission electron microscope using a C atoms feedstock intentionally introduced into the microscope. The C substitutions for B and N atoms in the honeycomb lattices were demonstrated through electron energy loss spectroscopy, spatially resolved energy-filtered elemental mapping, and in situ electrical measurements. The preferential doping was found to occur at the sites more vulnerable to electron beam irradiation. This transformed BN nanostructures from electrical Insulators to conductors. It was shown that B and N atoms in a BN nanotube could be nearly completely replaced with C atoms via electron-beam-induced doping. The doping mechanism was proposed to rely on the knockout ejections-of B and N atoms and subsequent healing of vacancies with supplying C atoms.
Wei WXLXL, Golberg D, Chen Q, Bando Y, Peng LM. Phonon-Assisted Electron Emission from Individual Carbon Nanotubes. Nano Letters [Internet]. 2011;11:734-739. 访问链接Abstract SCI被引用次数:30.
A question of how electrons can escape from one surfaces has seldom been studied and is still not properly answered. Herein, lateral electron emission from a one-atom-thick surface is thoroughly studied for the first time. We study election emission from side surface of individual electrically biased carbon nanotubes (CNTs) both experimentally and theoretically and discover a new electron emission mechanism named phonon-assisted electron emission. A kinetic model based on coupled Boltzmann equations of electrons and optical phonons is proposed, and well describes experimentally measured lateral electron emission from CNTs. It is shown that the electrons moving along biased CNT can overflow from the one-atom-thick surface due to the absorption of hot forward-scattering optical phonons. A low working voltage, high emission density, and side emission character make phonon-assisted electron emission pin:nadir promising in electron source applications.
Tang D-M, Ren C-L, Wei X, Wang M-S, Liu C, Bando Y, Golberg D. Mechanical Properties of Bamboo-like Boron Nitride Nanotubes by In Situ TEM and MD Simulations: Strengthening Effect of Interlocked Joint Interfaces. Acs Nano. 2011;5:7362-7368. SCI被引用次数:52.
Wei XL, Golberg D, Chen Q, Bando Y, Peng L-M. Electric-field-direction dependent spatial distribution of electron emission along electrically biased carbon nanotubes. Physical Review B. 2011;84. SCI被引用次数:26.
Liu Y, Zhang Z, Wei X, Li Q, Peng L-M. Simultaneous Electrical and Thermoelectric Parameter Retrieval via Two Terminal Current-Voltage Measurements on Individual ZnO Nanowires. Advanced Functional Materials. 2011;21:3900-3906. SCI被引用次数:16.
Kawamoto N, Wang M-S, Wei X, Tang D-M, Murakami Y, Shindo D, Mitome M, Golberg D. Local temperature measurements on nanoscale materials using a movable nanothermocouple assembled in a transmission electron microscope. Nanotechnology. 2011;22. SCI被引用次数:11.