scholarly journals Field Emission from Self-Assembled Arrays of Lanthanum Monosulfide Nanoprotrusions

2008 ◽  
Vol 2008 ◽  
pp. 1-4 ◽  
Author(s):  
V. Semet ◽  
Vu Thien Binh ◽  
M. Cahay ◽  
K. Garre ◽  
S. Fairchild ◽  
...  
Keyword(s):  
Thin Films ◽  
Field Emission ◽  
Field Enhancement ◽  
Emission Data ◽  
Field Emission Properties ◽  
Alumina Films ◽  
Atomic Force ◽  
Field Emission Current ◽  
Field Emission Microscopy ◽  
Lanthanum Monosulfide

The field emission properties of LaS nanoprotrusions called nanodomes, formed by pulsed laser deposition on porous anodic alumina films, have been analyzed with scanning anode field emission microscopy. The voltage necessary to produce a given field emission current is∼3.5 times less for nanodomes than for thin films. Assuming the same work function for LaS thin films and nanoprotrusions, that is,∼1 eV, a field enhancement factor of∼5.8 is extracted for the nanodome emitters from Fowler-Nordheim plots of the field emission data. This correlates well with the aspect ratio of the tallest nanodomes observed in atomic force micrograph measurements.

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.

scholarly journals Effects of applying stress on the electron field emission properties in amorphous carbon thin films

2005 ◽  
Vol 86 (23) ◽  
pp. 232102 ◽  
Author(s):  
C. H. P. Poa ◽  
S. R. P. Silva ◽  
R. G. Lacerda ◽  
G. A. J. Amaratunga ◽  
W. I. Milne ◽  
...  
Keyword(s):  
Thin Films ◽  
Field Emission ◽  
Amorphous Carbon ◽  
Electron Field Emission ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Electron Field ◽  
Carbon Thin Films ◽  
Electron Field Emission Properties

A Field Emission Study of the Critical Parameters of Amorphous Carbon Films Deposited on a Variety of Carbonaceous Substrates

1997 ◽  
Vol 498 ◽  
Author(s):  
A. P. Burden ◽  
R. Forrest ◽  
S.R.P. Silva ◽  
B. J. Sealy ◽  
G.A.J. Amaratunga
Keyword(s):  
Film Thickness ◽  
Field Emission ◽  
Amorphous Carbon ◽  
Field Enhancement ◽  
Carbon Films ◽  
Critical Parameters ◽  
Fully Depleted ◽  
Amorphous Carbon Films ◽  
Field Emission Properties ◽  
Pre Treatment

ABSTRACTThe field emission properties of a variety of nitrogen-containing hydrogenated amorphous carbon films have been characterised as a function of film thickness and substrate type. Identified trends have been discussed in terms of the optical band-gap and refractive index of the films, and the surface roughness of the substrates. In addition, carbon-based materials have been considered as inexpensive film-compatible substrates, and an in-situ oxygen plasma pre-treatment has been investigated as a means of changing the field enhancement factor of the system. We have achieved field emission with threshold voltages as low as 8 V μm−1, and we present data that supports the view that the electron emission from amorphous carbon is dependent on the nature of the back contact, and possibly the ease at which the film can be fully depleted, i.e. film thickness.

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.

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