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.

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.

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.

scholarly journals Synthesis and Field Emission Properties of Hierarchical ZnO Nanostructures

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Deyan Peng ◽  
Yanjun Huang ◽  
Ke Yu ◽  
Lijun Li ◽  
Ziqiang Zhu
Keyword(s):  
Field Emission ◽  
Thermal Evaporation ◽  
Building Blocks ◽  
Zno Nanostructures ◽  
X Ray Diffraction ◽  
X Ray ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Microelectronic Devices ◽  
Source Materials

Three novel kinds of hierarchical ZnO nanostructures: nanocombs nanoscrewdrivers and nanonails, have been synthesized in large quantities via a simple thermal evaporation process in the same run of growth in different regions of the quartz tube. The morphologies could be well controlled by adjusting the distances between the source materials and the substrates. These ZnO products were investigated by scanning electron microscopy, X-ray diffraction and Raman spectroscopy. The field emission properties of the ZnO nanostructures were investigated. These hierarchical ZnO nanostructures may be attractive building blocks for field emission microelectronic devices and other 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.

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.

scholarly journals A Highly Selective Turn-On Fluorescent Probe for the Detection of Zinc

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3825
Author(s):  
Ling-Yi Shen ◽  
Xiao-Li Chen ◽  
Xian-Jiong Yang ◽  
Hong Xu ◽  
Ya-Li Huang ◽  
...  
Keyword(s):  
High Selectivity ◽  
Fluorescence Probe ◽  
Stoichiometric Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Turn On ◽  
Imine Nitrogen ◽  
System A ◽  
Plot Analysis ◽  
L System

A novel turn-on fluorescence probe L has been designed that exhibits high selectivity and sensitivity with a detection limit of 9.53 × 10−8 mol/L for the quantification of Zn2+. 1H-NMR spectroscopy and single crystal X-ray diffraction analysis revealed the unsymmetrical nature of the structure of the Schiff base probe L. An emission titration experiment in the presence of different molar fractions of Zn2+ was used to perform a Job’s plot analysis. The results showed that the stoichiometric ratio of the complex formed by L and Zn2+ was 1:1. Moreover, the molecular structure of the mononuclear Cu complex reveals one ligand L coordinates with one Cu atom in the asymmetric unit. On adding CuCl2 to the ZnCl2/L system, a Cu-Zn complex was formed and a strong quenching behavior was observed, which inferred that the Cu2+ displaced Zn2+ to coordinate with the imine nitrogen atoms and hydroxyl oxygen atoms of probe L.

Preparation and Research of Anionic and Cationic Secondary Modified Organophilic Montmorillonite

2011 ◽  
Vol 396-398 ◽  
pp. 417-420 ◽  
Author(s):  
Xiao Hua Gu ◽  
Shi Wei Li ◽  
Bing Zheng ◽  
Jia Liang Zhou
Keyword(s):  
Cationic Surfactants ◽  
Anionic Surfactants ◽  
Interlayer Spacing ◽  
X Ray Diffraction ◽  
X Ray ◽  
Modification Effect ◽  
Novel Method ◽  
Organophilic Montmorillonite

A novel method is proposed to modify montmorillonite with anionic surfactants, cationic surfactants and halides stearyl cationic surfactants made by our group (Z-surfactant). The structure of organophilic montmorillonite (OMMT) was characterized by XRD and TG. The results of X-ray diffraction show that cationic surfactants and anionic surfactants are all intercalated into the layer of MMT. When modified with cationic surfactants, the interlayer spacing of MMT increases from 1.24 nm to the maximum of 3.76 nm. When it was secondary modified, the insertion order is to insert the cation first and then the anion. The interlayer spacing of montmorillonite increases to 4.80 nm, the modification effect is well.

scholarly journals Improved Field Emission Properties of Carbon Nanostructures by Laser Surface Engineering

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1931
Author(s):  
Minh Nhat Dang ◽  
Minh Dang Nguyen ◽  
Nguyen Khac Hiep ◽  
Phan Ngoc Hong ◽  
In Hyung Baek ◽  
...  
Keyword(s):  
Field Emission ◽  
Edge Effect ◽  
Carbon Nanostructures ◽  
Surface Engineering ◽  
Nanostructured Carbon ◽  
Carbon Cathode ◽  
Electron Sources ◽  
Field Emission Properties ◽  
Turn On ◽  
New Type

We herein present an alternative geometry of nanostructured carbon cathode capable of obtaining a low turn-on field, and both stable and high current densities. This cathode geometry consisted of a micro-hollow array on planar carbon nanostructures engineered by femtosecond laser. The micro-hollow geometry provides a larger edge area for achieving a lower turn-on field of 0.70 V/µm, a sustainable current of approximately 2 mA (about 112 mA/cm2) at an applied field of less than 2 V/µm. The electric field in the vicinity of the hollow array (rim edge) is enhanced due to the edge effect, that is key to improving field emission performance. The edge effect of the micro-hollow cathode is confirmed by numerical calculation. This new type of nanostructured carbon cathode geometry can be promisingly applied for high intensity and compact electron sources.

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