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CNT emitters were fabricated on a metal mesh by filtrating the aqueous suspensions containing both highly crystalline thin MWCNTs and thick, entangled MWCNTs in sequence. Additionally, we filtrated the Co-Ni metal-organic solution and formed Co-Ni oxide layers on the CNT networks to improve their adhesion and to protect the CNT emitters from being damaged during operation.
It is crucial to develop a CNT-based x-ray source operating at low gate voltage with high emission current density. We have performed electron optics simulations for a few potentially effective structures. For higher emission current at lower gate voltage, it is desirable to use an emitter shape with higher field enhancement factor. We have devised a structure with line emitters with a rectangular...
The experimental results of polymeric nanocomposite emission characteristic dynamics and vacuum level deviation interrelation are presented. It is shown that there are distinctive values of the emission current defining further course of emission. The nanocomposite emission dynamic behavior is explained by the contribution of thermal emission and influence of adsorption-desorption processes.
The perpendicularly cut end of the carbonized mechanical pencil lead shows superior field emission (FE) features, that is, the lower threshold electric field, the extremely lower effective work function, and the quite higher maximum current density, even though the corner edge is rounded. In this paper, we have discussed the mechanism of the superior FE features on the basis of the comparison with...
We have theoretically investigated the cooling effect of field emission from metals and n-type semiconductors. The potential energy was found as a function of the tip curvature and the emission distance. The use of the obtained potential leads to the calculation of the energy exchange as a function of two geometrical quantities. The cooling power needed for micro-electronic device is obtained for...
We developed a carbon nanotube field emission x-ray system for computed tomography imaging. The obtained x-ray images were reconstructed to tomography image using back projection and filtered back projection algorithm. The resulting reconstructed x-ray image clearly shows micrometer scale.
It is impossible to inspect contact/via hole on wafer through optic inspection system because of resolution. Now, Single-electron beam inspection system is used for it. But sample test below 10% is done because this method is quite slow on inspection. Micro-column is available in multi column array, high speed inspection, expansibility and productivity improvement. This paper presents the controller...
A high-voltage GaN Schottky barrier diode (SBD) on a Si substrate was fabricated by surface-O2 treatment. The surface of the active area was annealed in O2 ambient at 800 oC after Ohmic-contact formation. The isolation-leakage current, which flowing from a mesa to another one, was considerably suppressed from 2.4×10−3 to 2.7×10−10 A/mm at 100 V by O2 treatment. The device leakage current was also...
We report a novel approach to the rational fabrication of high quality strain controlled wurtzite ZnO nanowire arrays on conductive silicon and ITO substrates by a facile hydrothermal method. The quality of the ZnO nanowire arrays is dramatically improved by hanging the substrate above from the bottom of the Teflon lined autoclave. For comparison, the field emission device performance of the ZnO nanowire...
Layered graphene were synthesized on carbon nanotubes surface by MWCVD method with the pretreatment of carbon nanotube. The field emission propertied of graphene-carbon nanotube complex material emitter. This kind of emitter may have potential applications in field emission display device for improving emission uniform.
The dependence of the rate and final height of the electron beam deposited platinum on the control parameters were studied by varying electron probe current density (PCD), accelerating voltage and deposition time.
Field emission properties of α-Fe2O3 nanotips were studied after they were exposed to X-ray irradiation from synchrotron radiation. The field emission threshold field of α-Fe2O3 nanotips decreased after X-ray irradiation. X-ray photoelectron spectroscopy results revealed that nitrogen content in α-Fe2O3 nanotips increased with irradiation time. The change in field emission properties of α-Fe2O3 nanotips...
ZnO Nano-chrysanthemum arrays are both synthesized on silicon nano-needles and in silicon micro-holes with hydrothermal method. A ZnO Nano-chrysanthemum is a bunch of ZnO nanorods reaches out from one root. The influence of the reaction time has been carefully discussed and the Van der Waals force is regarded as the driving force from one needle to one Nano-chrysanthemum. This configuration helps...
We measured the field emission (FE) properties and life time stability of single walled carbon nanotubes (SWNTs) after coating with wide-band-gap material (WBGM) and successive negative electron affinity (NEA) material, i.e., magnesium oxide and successive gallium arsenide. Their turn-on field and emission current densities were measured and compared with pristine SWNT film. The FE was increased successively...
The microengineered miniature silicon-glass micropump has been shown for the first time ever. The device consists of lateral CNT-based cold cathode surrounded by an oval anode. Field-emitted electrons ionize residual gas particles, which are collected by a collecting electrode covered with active thin-film Ti getter co-operating with NEG getter (SAES, Italy). Preliminary results showed good pumping...
In this paper, the tunable thicknesses of quantum dot emitting layer were studied and QD-LEDs based on the optimum thickness of quantum dot layer were fabricated. From the experiment results, the maximum PL intensity is achieved at the spin-coating speed of 1000 r.p.m. The QD-LEDs based on the optimum thickness of quantum dot layer exhibit a low turn-on voltage of 3.1V.
We have successfully fabricated the reliable vacuum-sealed X-ray tube with carbon nanotube (CNT) emitters through a specially designed brazing process. The robust CNT emitters were also adopted for high-temperature endurance during the brazing process. The stable field emission current from the sealed X-ray tube indicated a good maintenance of vacuum level needed for the CNT field emitters. The stability...
A film composed of CdS quantum dot deposited on vertical aligned carbon nanotube (v-CNT) is fabricated by the electrodeposition method. The quantum dot sensitized solar cell (QDSSC) based on v-CNT/CdS has the photoresponse due to the photogenerated electrons can transfer from CdS QDs to v-CNT. A photocurrent density of ∼0.6 mA/cm2 and an open voltage of 0.57 V has been achieved for this novel photovoltaic...
A two-dimensional array of a 10-μm-diameter Ti/Au disk with a pitch of 50 μm was prepared on a glass substrate by electron-beam lithography. Titanium-oxide nanostructures were fabricated by oxidation and annealing of the array. Field-emission current was observed at an applied electric field over approximately 10 V/μm.
This report describes about the fundamental experimental results for x-ray imaging device which consists of a Schottky Cadmium Telluride (CdTe) diode and a scanning focused electron beam. It successfully demonstrated that the two kinds ways for reading out signal by electron beam. It was investigated in details about the output current dependencies of intensity and photon energy. 200μm stainless mesh...
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