Learn More
The low-frequency electronic noise properties of individual single-wall metallic carbon nan-otubes are investigated. The noise exhibits a 1/f frequency dependence and a V 2 voltage dependence. The noise power at 8 K appears to be three orders of magnitude smaller than at 300 K. As a demonstration of how these noise properties affect nanotube devices, a(More)
The reported thermal conductivity (kappa) of suspended graphene, 3000 to 5000 watts per meter per kelvin, exceeds that of diamond and graphite. Thus, graphene can be useful in solving heat dissipation problems such as those in nanoelectronics. However, contact with a substrate could affect the thermal transport properties of graphene. Here, we show(More)
We have batch-fabricated a microdevice consisting of two adjacent symmetric silicon nitride membranes suspended by long silicon nitride beams for measuring thermophysical properties of one-dimensional nanostructures (nanotubes, nanowires, and nanobelts) bridging the two membranes. A platinum resistance heater/thermometer is fabricated on each membrane. One(More)
In rat models to induce both focal cerebral ischemia and chronic cerebral hypoperfusion, it is highly desirable to verify the success of vessel occlusion and reopening with non-invasive method. The contrast-agent free 3D time-of-flight magnetic resonance angiography (TOF-MRA), diffusion-weighted imaging (DWI) and T2-weighted imaging by 3.0-T MR clinical(More)
The thermal conductivity of suspended few-layer hexagonal boron nitride (h-BN) was measured using a microbridge device with built-in resistance thermometers. Based on the measured thermal resistance values of 11-12 atomic layer h-BN samples with suspended lengths ranging between 3 and 7.5 μm, the room-temperature thermal conductivity of a 11-layer sample(More)
On the basis of scanning thermal microscopy (SThM) measurements in contact and lift modes, the low-frequency acoustic phonon temperature in electrically biased, 6.7-9.7 μm long graphene channels is found to be in equilibrium with the anharmonic scattering temperature determined from the Raman 2D peak position. With ∼100 nm scale spatial resolution, the SThM(More)
Iodine-doped graphene has been successfully fabricated through a simple, economical, and scalable approach. The new metal-free catalyst can exhibit a high catalytic activity, long-term stability, and an excellent methanol tolerance for the oxygen reduction reaction.
We present mK-temperature non-linear current-voltage characteristics of an individual single-wall carbon nanotube as a function of magnetic field. The measurements show Coulomb blockade and resonant tunneling through single molecular levels. Correlations between the addition spectrum and the excitation spectrum are observed. The magnetic field dependence of(More)
We have successfully developed an ethylene glycol mediated solution phase method for synthesizing highly crystalline Bi(2)Te(3) nanotubes using Te nanowires as the in situ templates; our work demonstrates the generic feature of a solution phase mediated Kirkendall effect for the synthesis of not only hollow nanoparticles but also highly crystalline tubular(More)