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Compact field emission (FE) scanning electron microscope (SEM) equipped with a multiwall carbon nanotube (MWCNT) emitter has been experimentally manufactured. An electrostatic extraction and focusing lens designated to the CNT field emitter was designed. Electron emission from a MWCNT was stable under a vacuum of 10−7 Pa even without a stabilization resistance. The maximum acceleration voltage was...
We demonstrated a novel point-typed carbon nanotube field emitters using a triangular-shaped carbon nanotube films. We also investigated the field emission properties of the field emitters according to the tip angles. The wider field emitters exhibited higher emission current, and the field emitters with a tip angle of 120° showed extremely high emission current density over 104 A/cm2 (> 10 mA)...
Field emission microscopy (FEM) and in-situ transmission microscopy (TEM) studies on electron emission from a piece of exfoliated multilayered graphene revealed that the structure of graphene edges changed from open before field emission (FE) measurement to closed after FE under high emission current over a few tens μA (107–108 A/cm2 in current density). Dynamic behaviour of metal (Al and Au) deposited...
This paper presents In situ quick repairing of defects inside a telescoping multi-walled carbon nanotubes (MWCNTs) using contact resistance. The defects were inserted and repaired by In situ nanomanipulation technique inside a transmission electron microscope (TEM). The defects were quickly (less than ∼0.1 s) repaired by applying a current after contact with electrode. The repairing of defects was...
Carbon nanotubes (CNTs) possess various unique properties such as a needle-like shape with nanometer-size diameter, high mechanical strength, chemical stability and high electrical conductivity, which are advantages as field electron emitters. Dynamic behavior of CNT emitters revealed by field emission microscopy (FEM) and in-situ transmission electron microscopy (TEM) are first presented, and then...
Six pentagons located at a tip of MWNT and behavior of a single gas molecule on the pentagons can be observed by field emission microscopy (FEM) using multiwall carbon nanotube (MWNT) with clean surface. Pulse laser irradiation is effective method to obtain the clean surface, and desorption of molecule on a pentagon can be artificially and responsively controlled by this method. Adsorption of a gas...
The electron optical system of a micro-focused X-ray source with carbon nanotube field emitter is modified to improve the resolution of X-ray transmission image and penetrating power
This article presents a preliminary results on the development of a compact FE-SEM equipped with a multiwall carbon nanotube field emission cathode, a Butler electrostatic lens as a condenser lens and an objective lens made of a permanent magnet. The instrument was tested on a Cu 200 mesh with 25 mum line width
The growth characteristics, such as temperature and pressure dependence, of carbon nanotubes (CNTs) by alcohol catalytic CVD (ACCVD) were studied. The thickness of the CNT layer is examined using scanning electron microscopy It was confirmed that the growth temperature could be lowered to as low as 400degC. This result indicates that the ACCVD technique is suitable for the low temperature CNT-FEA...
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