Synthesis of Carbon–Nitrogen Nanostructures by Hot Isostatic Pressure Apparatus and Their Field Emission Properties

2007 ◽  
Vol 7 (2) ◽  
pp. 570-574
Author(s):  
Yang Doo Lee ◽  
V. D. Blank ◽  
D. V. Batov ◽  
S. G. Buga ◽  
Yun-Hi Lee ◽  
...  
Keyword(s):  
Field Emission ◽  
Field Enhancement ◽  
Glass Frit ◽  
Gas Mixture ◽  
Nitrogen Gas ◽  
Field Emission Properties ◽  
Turn On ◽  
Field Emitters ◽  
Enhancement Factors ◽  
Resistive Heater

Carbon–nitrogen (CN) nanofibers were synthesized in argon–nitrogen gas mixture at 75 MPa by high isostatic pressure (HIP) apparatus using a graphite resistive heater. The CN nanofibers were grown in random with the diameter of about 200 nm and the length over 5 μm. The structures obtained can be divided bamboo-like, spring-like, and bead necklace-like CN nanofibers. The nitrogen content of up to 8.4% was found in CN nanofibers by EELS analysis. Field emission results showed that the density of field emitters and the field enhancement factors changed by surface treatments and that CN nanofibers contained glass frit. The screen-printed CN nanofiber had a turn-on field of 2 V/μm.

Novel Method of Growing Ultrananocrystalline Diamond Tips and Their Field Emission Property Study

2008 ◽  
Vol 8 (8) ◽  
pp. 4198-4201 ◽  
Author(s):  
P. T. Joseph ◽  
Li-Ju Chen ◽  
Nyan-Hwa Tai ◽  
Umesh Palnitkar ◽  
Hsiu-Fung Cheng ◽  
...  
Keyword(s):  
Field Emission ◽  
Field Enhancement ◽  
Emission Sources ◽  
Insulating Materials ◽  
Field Emission Properties ◽  
Turn On ◽  
Field Emitters ◽  
Ultrananocrystalline Diamond ◽  
Novel Method

Different forms of diamond have been shown to have qualities as field emission sources. As a consequence, much effort has been focused on both the synthesis of diamond nanostructures to increase the field enhancement factor and understanding the emission mechanism in these nominally insulating materials. In our recent study, we have grown ultrananocrystalline diamond (UNCD) coated nanocrystalline diamond (NCD) tips on NCD films for field emitters. The films were characterized using field emission scanning electron microscopy and Raman spectroscopy to identify the quality of the films. The fabricated different sizes of pyramid tips and their field emission properties are reported. It has been observed that with increase in tip size, the turn on voltage also increases.

Field Emission Site Densities of Nanostructured Carbon

2001 ◽  
Vol 675 ◽  
Author(s):  
J B Cui ◽  
J Robertson ◽  
W I Milne
Keyword(s):  
Field Emission ◽  
Applied Field ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Carbon Films ◽  
Vacuum Arc ◽  
Nanostructured Carbon ◽  
Field Emission Properties ◽  
Site Density ◽  
Enhancement Factors

ABSTRACTThe field emission properties of nanostructured carbon films deposited by cathodic vacuum arc in a He atmosphere have been studied by measuring the emission currents and the emission site density. The films have an onset field of ∼3 V/μm. The emission site density is viewed on a phosphor anode and it increases rapidly with applied field. It is assumed that the emission occurs from surface regions with a range of field enhancement factors but with a constant work function. The field enhancement factor is found to have an exponential distribution.

Fabrication and Field Emission Properties of Poly-CuTAPc Nanowires and Nanotubes

2009 ◽  
Vol 62 (9) ◽  
pp. 1007 ◽  
Author(s):  
Feng Gu ◽  
Chorng Haur Sow ◽  
Guo Qin Xu ◽  
Siau Gek Ang
Keyword(s):  
Field Emission ◽  
Enhancement Factor ◽  
Monomer Concentration ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Maximum Current Density ◽  
Turn On ◽  
Field Emitters ◽  
Maximum Current ◽  
Organic Nanomaterials

Poly-copper tetraaminophthalocyanine (CuTAPc) nanowires and nanotubes were successfully fabricated on porous anodic aluminium oxide (AAO) templates by electropolymerization and characterized. The product of electropolymerization, whether as nanowires or nanotubes, is a function of the monomer concentration and template pore size. The morphology and field emission properties of these nanostructures were studied for investigation of potential application as field emitters. They show interesting turn-on field, maximum current density and enhancement factor, comparable to many other organic nanomaterials.

Effect of Catalyst Thickness and Plasma Pretreatment on the Growth of Carbon Nanotubes and Their Field Emission Properties

2007 ◽  
Vol 7 (11) ◽  
pp. 3731-3735 ◽  
Author(s):  
Hyung Soo Uh ◽  
Sang Sik Park ◽  
Byung Whan Kim
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Field Enhancement ◽  
Close Relation ◽  
Emission Current Density ◽  
Ni Catalyst ◽  
Emission Characteristics ◽  
Field Emission Properties ◽  
Turn On ◽  
Plasma Pretreatment

We demonstrated that the diameter and the density of carbon nanotubes (CNTs) which had a close relation to electric-field-screening effect could be easily changed by the control of catalytic Ni thickness combined with NH3 plasma pretreatment. Since the diameter and the density of CNTs had a tremendous impact on the field-emission characteristics, optimized thickness of catalyst and application of plasma pretreatment greatly improved the emission efficiency of CNTs. In the field emission test using diode-type configuration, well-dispersed thinner CNTs exhibited lower turn-on voltage and higher field enhancement factor than the densely-packed CNTs. A CNT film grown using a plasma-pretreated 25 Å-thick Ni catalyst showed excellent field emission characteristics with a very low turn-on field of 1.1 V/μm @ 10 μA/cm2 and a high emission current density of 1.9 mA/cm2 @ 4.0 V/μm, respectively.

Field Emission from Nanocrystalline Diamond/Carbon Nanowall Composite Films Deposited on Scratched Substrates

2012 ◽  
Vol 1395 ◽  
Author(s):  
C.Y. Cheng ◽  
M. Nakashima ◽  
K. Teii
Keyword(s):  
Field Emission ◽  
Enhancement Factor ◽  
Composite Films ◽  
Diamond Films ◽  
Field Enhancement ◽  
Nanocrystalline Diamond ◽  
Field Emission Properties ◽  
Turn On ◽  
Carbon Nanowalls ◽  
Wall Spacing

ABSTRACTWe report the deposition and field emission properties of nanostructured composites consisting of carbon nanowalls (CNWs) and nanocrystalline diamond films by introducing two kinds of substrate scratching pretreatment, i.e., undulation and ultrasonic vibration. With increasing duration of scratching pretreatment, the morphology of the deposits changes from simple CNWs to a film/CNW composite and lastly to CNWs on a film, and then the space between the walls is increased. The emission turn-on field is reduced from 2.1 V/μm for simple CNWs to around 1.2 V/μm for the composite films, accompanied by an increase in field enhancement factor. The results indicate that electric field screening between the walls is successfully suppressed by widening of the wall spacing.

Effect of Catalyst Thickness and Plasma Pretreatment on the Growth of Carbon Nanotubes and Their Field Emission Properties

2007 ◽  
Vol 7 (11) ◽  
pp. 3731-3735
Author(s):  
Hyung Soo Uh ◽  
Sang Sik Park ◽  
Byung Whan Kim
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Field Enhancement ◽  
Close Relation ◽  
Emission Current Density ◽  
Ni Catalyst ◽  
Emission Characteristics ◽  
Field Emission Properties ◽  
Turn On ◽  
Plasma Pretreatment

We demonstrated that the diameter and the density of carbon nanotubes (CNTs) which had a close relation to electric-field-screening effect could be easily changed by the control of catalytic Ni thickness combined with NH3 plasma pretreatment. Since the diameter and the density of CNTs had a tremendous impact on the field-emission characteristics, optimized thickness of catalyst and application of plasma pretreatment greatly improved the emission efficiency of CNTs. In the field emission test using diode-type configuration, well-dispersed thinner CNTs exhibited lower turn-on voltage and higher field enhancement factor than the densely-packed CNTs. A CNT film grown using a plasma-pretreated 25 Å-thick Ni catalyst showed excellent field emission characteristics with a very low turn-on field of 1.1 V/μm @ 10 μA/cm2 and a high emission current density of 1.9 mA/cm2 @ 4.0 V/μm, respectively.

scholarly journals Field Emission Characterization of MoS2 Nanoflowers

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 717 ◽  
Author(s):  
Filippo Giubileo ◽  
Alessandro Grillo ◽  
Maurizio Passacantando ◽  
Francesca Urban ◽  
Laura Iemmo ◽  
...  
Keyword(s):  
Field Emission ◽  
Field Enhancement ◽  
Separation Distance ◽  
Curvature Radius ◽  
Small Areas ◽  
Field Emission Properties ◽  
Field Emitters ◽  
Field Emission Current ◽  
Potential Applicability ◽  
Tungsten Tip

Nanostructured materials have wide potential applicability as field emitters due to their high aspect ratio. We hydrothermally synthesized MoS2 nanoflowers on copper foil and characterized their field emission properties, by applying a tip-anode configuration in which a tungsten tip with curvature radius down to 30–100 nm has been used as the anode to measure local properties from small areas down to 1–100 µm2. We demonstrate that MoS2 nanoflowers can be competitive with other well-established field emitters. Indeed, we show that a stable field emission current can be measured with a turn-on field as low as 12 V/μm and a field enhancement factor up to 880 at 0.6 μm cathode–anode separation distance.

Enhanced Field Emission Properties of Carbon Nanotube Based Field Emitters by Dynamic Oxidation

2013 ◽  
Vol 9 (5) ◽  
pp. 619-623 ◽  
Author(s):  
Shama Parveen ◽  
Samina Husain ◽  
Avshish Kumar ◽  
Javid Ali ◽  
Mubashshir Husain ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Field Emission ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Field Emitters ◽  
Dynamic Oxidation

Field-Emission Triode of Tetrapod-Like ZnO Film Using Metal Mesh

2011 ◽  
Vol 233-235 ◽  
pp. 2600-2603 ◽  
Author(s):  
Li An Ma ◽  
Chao Xing Wu ◽  
Jin Yang Lin ◽  
Li Qin Hu ◽  
Tai Liang Guo
Keyword(s):  
Chemical Vapor Deposition ◽  
Field Emission ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Raw Material ◽  
Anode Current ◽  
Zno Film ◽  
Metal Mesh ◽  
Turn On ◽  
Field Emitters

Using Zn powder as the raw material, Tetrapod-like ZnO nanoneedles with controllable morphology and size were successfully prepared by chemical vapor deposition. A screen printed normal-gated triode with Tetrapod-like ZnO nanoneedles field emitters is demonstrated. Field emission measurements show that the Tetrapod-like ZnO nanoneedles FED triode devices posses a good field emission property. The turn-on voltage is 270V. An anode current of 2.75 mA and a gate current of 0.43 mA are extracted at a gate voltage of 600 V with a brightness of 2300 cd/m2.

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