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.

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.

Effect of Current Density on Composition and Microstructure of Boronized Layer by Electrodeposition

2011 ◽  
Vol 338 ◽  
pp. 589-593
Author(s):  
Guo Zhang Tang ◽  
Yun Gang Li ◽  
Ning He ◽  
Yu Zhu Zhang ◽  
Hai Li Yang
Keyword(s):  
Glow Discharge ◽  
Current Density ◽  
Molten Salts ◽  
Steel Substrate ◽  
Xrd Analysis ◽  
Silicon Steel ◽  
X Ray Diffraction ◽  
Cross Sectional ◽  
X Ray ◽  
Compositional Depth Profile

Boronized layer was prepared on silicon steel substrate by pulse electrodeposition in KCl-NaCl-NaF-Na2B4O7 molten salts with different current density. The effect of current density on composition and microstructure of boronized layer was studied. The phase, the cross-sectional morphology and the compositional depth profile of the layer were studied by X-ray diffraction analysis (XRD), optical microscopy (OM) and glow discharge spectrometry (GDS). The presence of FeB on the surface of the boronizied steel was confirmed by XRD analysis. Cross sectional observation revealed that the boronized layer consisted of the outer layer FeB and the sublayer Fe2B. In addition, the low current density produced more proportion of Fe2B and bigger saw-tooth grains.

Field Emission Properties of ZnO Nanorods Synthesized by Aqueous Solutions

2010 ◽  
Vol 663-665 ◽  
pp. 33-36
Author(s):  
Bo Gao ◽  
Hai Ming Zhang ◽  
Yan Jun Zhu ◽  
Yu Jie Li ◽  
Guo Feng Hu
Keyword(s):  
Aqueous Solutions ◽  
Field Emission ◽  
Zno Nanorods ◽  
Threshold Field ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Field Emission Properties ◽  
Turn On ◽  
Structure Properties

In this paper, we introduce a simple and effective method to prepare ZnO nanorods using aqueous solutions. The morphology and structure properties of ZnO nanorods were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD) and photoluminescence (PL). The SEM results indicated that the diameter of ZnO nanoroads was about 100 nm. The XRD pattern showed that the ZnO nanorods had high-purity wuruzite structure. The PL spectrum revealed that ZnO nanorods had a strong visible emission at 423 nm. The field emission (FE) properties of ZnO nanorods were also studied. The FE results showed that the turn-on field and threshold field were 24V/μm and 39V/μm, respectively.

scholarly journals Field Emission Characteristics ofSnO2/CNTs Composites Prepared by Microwave-Assisted Wet Impregnation

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Sreejarani K. Pillai ◽  
Sarah C. Motshekga ◽  
Suprakas Sinha Ray ◽  
John Kennedy
Keyword(s):  
Field Emission ◽  
Emission Current Density ◽  
Rutile Phase ◽  
Emission Characteristics ◽  
X Ray Diffraction ◽  
Raman Analysis ◽  
Wet Impregnation ◽  
X Ray ◽  
Microwave Assisted ◽  
Field Emission Performance

The SnO2/CNT composites were prepared by microwave-assisted wet impregnation at 60°C. The process was optimized by varying the microwave power and reaction time. Raman analysis showed the typical features of the rutile phase of as-synthesized SnO2nanoparticles on CNTs, which was consistent with the results from X-ray diffraction. Enhanced field emission performance was observed for SnO2/CNTs composite prepared by a microwave method when compared to pure CNTs and SnO2/CNTs composite prepared by conventional wet impregnation. The dependence of emission current density on the electric field followed a Fowler-Nordheim relationship.

scholarly journals Bimetallic Co-Based (CoM, M = Mo, Fe, Mn) Coatings for High-Efficiency Water Splitting

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 92
Author(s):  
Jadranka Milikić ◽  
Aldona Balčiūnaitė ◽  
Zita Sukackienė ◽  
Dušan Mladenović ◽  
Diogo M. F. Santos ◽  
...  
Keyword(s):  
Current Density ◽  
Potassium Hydroxide ◽  
Electroless Deposition ◽  
High Efficiency ◽  
Low Cost ◽  
Copper Substrate ◽  
X Ray Diffraction ◽  
X Ray ◽  
A Current ◽  
Scanning Electron

Bimetallic cobalt (Co)-based coatings were prepared by a facile, fast, and low-cost electroless deposition on a copper substrate (CoFe, CoMn, CoMo) and characterized by scanning electron microscopy with energy dispersive X-ray spectroscopy and X-ray diffraction analysis. Prepared coatings were thoroughly examined for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline solution (1 M potassium hydroxide, KOH) and their activity compared to that of Co and Ni coatings. All five coatings showed activity for both reactions, where CoMo and Co showed the highest activity for HER and OER, respectively. Namely, the highest HER current density was recorded at CoMo coating with low overpotential (61 mV) to reach a current density of 10 mA·cm−2. The highest OER current density was recorded at Co coating with a low Tafel slope of 60 mV·dec−1. Furthermore, these coatings proved to be stable under HER and OER polarization conditions.

SYNTHESIS AND FIELD EMISSION PROPERTIES OF SnS2 AND In-DOPED SnS2 WITH HIERARCHICAL STRUCTURE

NANO ◽  
2011 ◽  
Vol 06 (05) ◽  
pp. 489-496 ◽  
Author(s):  
H. X. ZHONG ◽  
C. X. WANG
Keyword(s):  
Electron Microscopy ◽  
Field Emission ◽  
Photoelectron Spectroscopy ◽  
Sulfur Source ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
X Ray ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Transmission Electron

A simple hydrothermal route was employed to prepare flower-like SnS2 and In -doped SnS2 by using biomolecular L-cysteine as sulfur source. The synthetic samples were characterized by X-ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy, X-ray photoelectron spectroscopy and Raman spectroscopy in detail. Furthermore, the field emission from both the materials was investigated, it was found that both of them have excellent field emission properties, and the doped In has enhanced the field emission properties.

Fabrication and Field Emission Properties of In2O3 Nanorods

2013 ◽  
Vol 663 ◽  
pp. 417-420
Author(s):  
Bing Wang ◽  
Wu Huan Yu ◽  
Zheng Zhao Qiang
Keyword(s):  
Field Emission ◽  
Thermal Evaporation ◽  
Silicon Substrates ◽  
X Ray Diffraction ◽  
Au Catalyst ◽  
Vapor Liquid Solid ◽  
X Ray ◽  
Field Emission Properties ◽  
Morphology And Structure ◽  
Prepared Nanorods

A new nanostructure, 1D In2O3nanorod, have been grown on single silicon substrates by Au catalyst assisted thermal evaporation of In2O3and active carbon powders. The morphology and structure of the prepared nanorods are determined on the basis of field-emission scanning electron microscopy (FESEM) and x-ray diffraction (XRD). The field-emission properities of In2O3nanorods have been measured and analysed. The growth mechanism of the In2O3nanorods can be explained on the basis of the vapor–liquid–solid (VLS) processes.

Synthesis and Evaluation of Electrochemical Properties of Mesoporous Anatase Titania

2006 ◽  
Vol 301 ◽  
pp. 151-154 ◽  
Author(s):  
Tomomi Okada ◽  
Masaru Miyayama
Keyword(s):  
Current Density ◽  
Anatase Phase ◽  
Lithium Intercalation ◽  
Mesoporous Titania ◽  
X Ray Diffraction ◽  
X Ray ◽  
Anatase Titania ◽  
Titanium Tetrabutoxide ◽  
Hydrolysis Of ◽  
A Current

Lithium intercalation properties were investigated for mesoporous titania, prepared by hydrolysis of titanium tetrabutoxide followed by calcining at various temperatures. X-ray diffraction analysis showed that synthesized titania were anatase phase. The B.E.T. surface area of mesoporous titania decreased with increasing calcining temperature, but that of mesoporous titania calcined at 450°C was over 50 m2/g. Lithium intercalation capacities of mesoporous anatase increased with increasing calcining temperature up to 450°C. Mesoporous anatase titania calcined at 450°C showed a capacity of 118 mAh/g at a current density of 1 A/g. The lithium intercalation properties depended on crystallinity, remaining water content and mesopore size.

Top-Down Formation of GaN Nanocone Arrays for Application in Field Emission

2010 ◽  
Vol 44-47 ◽  
pp. 2514-2518
Author(s):  
Xin Zhong Wang ◽  
Guang Hui Yu ◽  
Shi Guo Li ◽  
Cheng Guo Wu
Keyword(s):  
Field Emission ◽  
Plasma Etching ◽  
Inductively Couple Plasma ◽  
X Ray Diffraction ◽  
Top Down ◽  
X Ray ◽  
Field Emission Properties ◽  
Turn On ◽  
Novel Method ◽  
Inductively Couple Plasma Etching

We present a novel method to fabricate uniform GaN nanocone arrays (GNA) using Nickel-nanoisland masks. The nanoscale conelike arrays with high density can be formed over the entire 2-inch wafer by inductively couple plasma etching. The results of X-ray diffraction exhibit significant decrease on the (102) reflection in GaN sample with the GNA. Field-emission measurements show that the GNA with sharp tips have a turn-on field of ~ 5.5 V/μm. It is believed that the high aspect ratio resulting from the conelike morphology is responsible for the enhancement of the field-emission properties of GNA.

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