scholarly journals Micro Flowers of SrS/Bi2S3 Nanocomposite and Its Field Emission Properties

2019 ◽  
Vol 3 (4) ◽  
pp. 105
Author(s):  
Aarti R. Gunjal ◽  
Ujjwala P. Chothe ◽  
Yogesh A. Sethi ◽  
Rajendra P. Panmand ◽  
Jalinder D. Ambekar ◽  
...  
Keyword(s):  
Field Emission ◽  
Current Density ◽  
Emission Current Density ◽  
Emission Current ◽  
Threshold Field ◽  
Light Illumination ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Morphological Studies ◽  
A Current

The three-dimensional hierarchical SrS/Bi2S3 heterostructures were synthesized by a template-free single-step hydrothermal method. The structural and morphological studies revealed the formation of a single crystalline orthorhombic heterostructure with rod-like morphologies possessing a high aspect ratio. The field emission properties of SrS/Bi2S3 nanorods were investigated. J–E and the Fowler–Nordheim (F–N) plot, as well as long-term field emission (FE) stability, were studied. SrS/Bi2S3 nanoflowers have enhanced the FE properties more than the virgin Bi2S3. The observed values of the re-producible turn-on field for SrS/Bi2S3 defined to draw an emission current density of ca. 1 µA/cm2 were found to be ca. 2.50 V/µm, and of the threshold field to draw a current density of ca. 10 µA/cm2 were found to be ca. 3.00 V/µm (without visible light illumination). A maximum emission current density of ca. 527 μA/cm2 was drawn without light and a current density of ca. 1078 μA/cm2 with light, which is higher than that of pristine Bi2S3.

Growth of Carbon Nanofibers on Electroless Ni-P Alloy Catalyst

2002 ◽  
Vol 740 ◽  
Author(s):  
T.K. Tsai ◽  
W.L. Liu ◽  
S.H. Hsieh ◽  
W.J. Chen
Keyword(s):  
Field Emission ◽  
Current Density ◽  
Small Diameter ◽  
Emission Current Density ◽  
Emission Current ◽  
Threshold Field ◽  
Random Orientation ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Electroless Ni

ABSTRATECarbon nanotubes (CNTs) were grown by electroless Ni-P plated on silicon substrate in a microwave heating chemical vapor deposition (CVD) system with methane gas at 700 °C. The CNTs grown on Ni–P catalyst showed random orientation and small diameter around 15–30 nm. Field emission test results indicated that the Ni–P catalyzed-CNTs exhibited excellent field emission properties. The turn-on field was about 0.56 V/μm with an emission current density 10 μA/cm2 and the threshold field was 4.4 V/μm with an emission current density 10 mA/cm2. These excellent field emission properties may be attributed to the random orientation and small diameter of CNTs.

Electrochemical Synthesis of Conducting Polypyrrole Film on Tin Substrate: Structural, Chemical and Field Emission Investigations

2015 ◽  
Vol 36 ◽  
pp. 44-50 ◽  
Author(s):  
Pankaj M. Koinkar ◽  
Sandip S. Patil ◽  
Toshihiro Moriga ◽  
Mahendra A. More
Keyword(s):  
Field Emission ◽  
Current Density ◽  
Electrochemical Synthesis ◽  
Applied Field ◽  
Emission Current Density ◽  
Emission Current ◽  
Threshold Field ◽  
Potential Candidate ◽  
High Emission ◽  
Very High

Electrochemical synthesis of Polypyrrole (PPy) thin films on Sn substrates has been carried out under cyclic voltammetry (CV) mode. The structural, morphological and chemical properties of the as-synthesized PPy films were investigated using various characterization techniques like SEM, UV-Visible and FTIR. Furthermore, field emission (FE) behaviour of the PPy thin film emitter were carried out at base pressure of ~ 1×10-8 mbar and found to be interesting. The threshold field, required to draw emission current density of 1 μA/cm2, is observed to be 0.90 V/μm and very high emission current density of 12.87 mA/cm2 has been drawn at applied field of ~ 2.8 V/μm. The emission current stability investigated at preset values of 1, 10 and 100 μA/cm2 is observed to be fairly good over duration of more than three hours. The simplicity of the synthesis route coupled with the capability to deliver very high emission current density at relatively lower applied field make the PPy thin field emitter as a potential candidate for practical applications in field emission based devices

Synthesis and Field Emission Properties of Hand-Like Bi2O3 Microcrystals

2010 ◽  
Vol 663-665 ◽  
pp. 50-53
Author(s):  
Jin Yang Lin ◽  
Yong Ai Zhang ◽  
Ling Jie Wang ◽  
L. Yang ◽  
Tai Liang Guo
Keyword(s):  
Field Emission ◽  
Current Density ◽  
Emission Current Density ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Chemical Route ◽  
X Ray ◽  
Field Emission Properties ◽  
Novel Structures ◽  
A Current

A simple solution chemical route for bulk synthesis of hand-like Bi2O3 microcrystals has been demonstrated. The microcrystals are assembled by several short rods that have a diameter in the range of 50-500 nm, and a length in the range of 1-20 μm. X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM) were employed to characterize the structure and morphology of these novel structures. The field emission of the sample started at a turn-on field of 2.1 V/μm at a current density of 0.1 μA/cm2, while the emission current density reached about 0.1mA/cm2 at an applied field of 5.5 V/μm. These results suggest that hand-like Bi2O3 microcrystals can be an excellent FE material candidate.

Field Emission Properties of Large Area Carbon Nanotube Cathodes in DC and Pulse Modes

2008 ◽  
Vol 1081 ◽  
Author(s):  
Qingliang Liao ◽  
Yue Zhang ◽  
Liansheng Xia ◽  
Junjie Qi ◽  
Yunhua Huang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electric Field ◽  
Field Emission ◽  
Direct Current ◽  
Current Density ◽  
Emission Current Density ◽  
Pulse Mode ◽  
Emission Current ◽  
Large Area ◽  
Emission Properties

AbstractA large area carbon nanotube cathode was fabricated by use of a screen printing method. The emission properties of the cathode were investigated in both direct current and pulse mode experiments. In the direct current mode, the cathode has high field enhancement factor and high emission current density. In the double-pulse mode, the emission current density can approach 267 A/cm2 at an applied electric field of 15.4 V/um. Steady intense electron beams were obtained from the cathode. The results proved that the emission mechanism of CNTs at pulse electric field is plasma-induced field emission. The carbon nanotube cathode is suitable for not only field emission display applications but also high-power microwave device applications.

The Field Emission of Globe-Like Diamond Microcrystalline Aggregate Films

2011 ◽  
Vol 279 ◽  
pp. 88-92
Author(s):  
Jin Hai Gao ◽  
Wu Qing Zhang ◽  
Zhen Li
Keyword(s):  
Field Emission ◽  
Electric Fields ◽  
Current Density ◽  
Microwave Plasma ◽  
Chemical Vapor ◽  
Chemical Vapor Deposition Method ◽  
Emission Properties ◽  
Plasma Chemical Vapor Deposition ◽  
Field Emission Properties ◽  
Turn On

The globe-like diamond microcrystalline aggregates films were fabricated by microwave plasma chemical vapor deposition method. The field emission properties and emission stability of the films were tested using a diode structure in vacuum. It was found that the globe-like diamond microcrystalline aggregates films exhibited good electron emission properties and stability. The turn-on field of 0. 55 V /μm and the current density of 11mA/cm2 at the electric fields of 2.73V/μm were obtained. At the successive operator circles, the turn-on field tends to stabilize at 1. 08V /μm and the current density of 6.6 mA/cm2 is obtained.

Investigation of the Field Emission Stability of Sphere-Like Diamond Microcrystalline-Aggregates Films

2014 ◽  
Vol 1035 ◽  
pp. 3-6
Author(s):  
Jin Hai Gao ◽  
Zhen Li ◽  
Wu Qing Zhang
Keyword(s):  
Field Emission ◽  
Indium Tin Oxide ◽  
Microwave Plasma ◽  
Metal Layer ◽  
Chemical Vapor ◽  
Emission Current Density ◽  
Diffraction Spectrum ◽  
Raman Scattering Spectroscopy ◽  
Emission Properties ◽  
Field Emission Properties

The sphere-like diamond microcrystalline-aggregates were fabricated by microwave plasma chemical vapor deposition (MPCVD) method. The ceramic with a Ti metal layer was used as substrates. The fabricated diamond microcrystalline aggregates were evaluated by Raman scattering spectroscopy, x-ray diffraction spectrum (XRD), scanning electron microscopy (SEM). The field emission properties were tested by using a diode structure in a vacuum. A phosphor-coated indium tin oxide (ITO) anode was used for observing and characterizing the field emission. It was found that the sphere-like diamond microcrystalline-aggregates films exhibited good electron emission properties. The turn-on field was only 0.55V/μm, and emission current density as high as 11mA/cm2 was obtained under an applied field of 2.18V/μm for the first operation. After several cycling operations, the field emission tended to stable characteristics of current versus voltage. The stability evolvement and mechanism are investigated relating to microstructure of the sphere-like diamond microcrystalline-aggregates films.

LaB6 nanowires and their field emission properties

2005 ◽  
Vol 901 ◽  
Author(s):  
Han Zhang ◽  
Jie Tang ◽  
Qi Zhang ◽  
Gongpu Zhao ◽  
Guang Yang ◽  
...  
Keyword(s):  
Field Emission ◽  
High Performance ◽  
Rectangular Cross Section ◽  
Chemical Vapor ◽  
Emission Current Density ◽  
Chemical Vapor Deposition Method ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Electron Microscopes ◽  
Electron Emitters

AbstractFor field-induced electron emission, the two factors that enable a high emission current density at low applied voltages are (a) low work function of the emitter and (b) sharpness of the emitter tip. We have developed and applied a chemical vapor deposition method to synthesize single-crystalline LaB6 nanowires for applications as point electron emitters. The crystallographic orientation of the grown nanowires can be controlled by the catalysts used in synthesis and their typical diameter is ranged from below 20 nm to over 100 nm. The nanowires’ tip is either hemispherical or flat top with rectangular cross-section depending on the catalyst being utilized. The field emission properties have also been measured from the single nanowire emitters and the results are discussed for applications as point electron sources used in high performance electron optical instruments such as the transmission and scanning electron microscopes.

Preparation and Field Emission Properties of Ag-CNTs by Electroless Plating

2010 ◽  
Vol 148-149 ◽  
pp. 983-986 ◽  
Author(s):  
Yu Xiang You ◽  
Yun Ye ◽  
Yi Jing Su ◽  
Qiao Zhi Tang ◽  
Tai Liang Guo
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Electroless Plating ◽  
Emission Current Density ◽  
Small Radius ◽  
Radius Of Curvature ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Pristine Cnts ◽  
Electrophoresis Deposition

Carbon nanotubes (CNTs) demonstrate attractive characteristics as cold cathode emitters for high aspect ratio, small radius of curvature, high mechanical strength and chemical stability. In this article, Ag-CNTs were prepared by a series of processes including acid-treating, sensitizing, activating and electroless plating. Then Ag-CNTs cathode were sucessfully fabricated by electrophoresis deposition (EPD) method. The morphologies of Ag-CNTs cathode and pristine CNTs cathode were observed by scanning electron microscopy (SEM). The results showed that the field emission properties of Ag-CNTs cathode were better than pristine CNTs cathode, for presenting lower turn-on field, larger emission current density, more stabilization and longer lifetime. Thus it can be seen that the Ag-CNTs cathode can improve the characteristics of carbon nanotubes field emission display (CNT-FED).

Electron Field Emission from Nano-Diamond Films

2001 ◽  
Vol 704 ◽  
Author(s):  
S.G. Wang ◽  
Q. Zhang ◽  
S.F. Yoon ◽  
J. Ahn ◽  
Q. Wang ◽  
...  
Keyword(s):  
Grain Size ◽  
Electric Field ◽  
Field Emission ◽  
Current Density ◽  
Diamond Films ◽  
Emission Current Density ◽  
Hydrogen Gas ◽  
Emission Current ◽  
Electron Field Emission ◽  
Electron Field

AbstractIn this paper, the field emission properties of nano-diamond films were investigated by measuring the curves of emission current density (J) versus applied electric field (E). The nano-diamond films were prepared on n-type (100) silicon substrate by microwave plasma enhanced chemical vapor deposition (MPECVD) technique using a gas mixture of nitrogen-methane-hydrogen. Field emission results show that, with increasing hydrogen gas flow ratio of [H2]/[N2+CH4+H2] from 0 to 10 %, diamond grain size increases from 5 to 60 nm, threshold electric field for electron field emission increases from 1.2 to 5.75 V/μm, and emission current density decreases from 820 to 560 μA/cm2, demonstrating that small grain size nano-diamond films are promising as a cathode material for low-field electron emitters.

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