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Li-doped ZnO nanoparticles were fabricated in aqueous solution of zinc nitrate and hexamethylenetetramine (HMTA) to which lithium chloride was added. SEM, XRD and TEM results revealed that the as-synthesized nanoparticles were crystalline wurzite ZnO with hexagonal flake morphology. ICP analysis confirmed the existence of Li element in these ZnO nanoparticles. For the measurement on their dielectric...
In this paper large area tungsten trioxide (WO3) nanosheets and nanoribbons are synthesized by directly heating tungsten plates covered with potassium iodide (KI). The field emission properties of the as-grown samples are systematically measured. A 10 μA/cm current density is obtained from both samples under a 5.5 V/μm average field, while the average fields that extracted a current density of 1.0...
A multiwalled carbon nanotube (MWCNT) was assembled onto a tungsten tip in a transmission electron microscope (TEM). Then it was transferred into a field-emission microscope (FEM) for the measurement of field emission properties. Stable field emission current and pattern were established after an aging process, which ridded the MWCNT of adsorption and blunted its end. A reduced brightness of 107-10...
Conical carbon fibers (CCFs) with carbon nanotubes (CNTs) as their cores were grown on graphite substrates with an improved chemical vapor deposition (CVD) method. The CNT core filaments demonstrated good mechanical strength probed by a scanning electron microscope. Furthermore, field emission currents around 100 muA were also attained from individual CNTs. The method has provided a convenient and...
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