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Electron Field Emission (electron + field_emission)
Selected AbstractsFabrication of Large-Scale Single-Crystalline PrB6 Nanorods and Their Temperature-Dependent Electron Field EmissionADVANCED FUNCTIONAL MATERIALS, Issue 5 2009Qin Yuan Zhang Abstract A simple catalysis-free approach that utilises a gas,solid reaction for the synthesis of large-scale single-crystalline PrB6 nanorods using Pr and BCl3 as starting materials is demonstrated. The nanorods exhibit a low turn-on electric field (2.80,V µ-b;m,1 at 10,µ-b;A cm,2), a low threshold electric field (6.99,V µ-b;m,1 at 1,mA cm,2), and a high current density (1.2,mA cm,2 at 7.35,V µ-b;m,1) at room temperature (RT). The turn-on and threshold electric field are found to decrease clearly from 2.80 to 0.95 and 6.99 to 3.55,V µ-b;m,1, respectively, while the emission current density increases significantly from 1.2 to 13.8,mA cm,2 (at 7.35,V µ-b;m,1) with an increase in the ambient temperature from RT to 623,K. The field enhancement factor, emission current density, and the dependence of the effective work function with temperature are investigated. The possible mechanism of the temperature-dependent emission from PrB6 nanorods is discussed. [source] Electron Field Emission and Photoluminescence of Anatase Nanotube ArraysJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 12 2008Yang Yang TiO2 nanotube arrays with a high aspect ratio were grown on conductive Ti substrates by anodization in an organic electrolyte. The as-prepared TiO2 nanotubes were vertically grown and adhered well to the substrates. The photoluminescence spectrum and X-ray diffraction showed that the crystal structure of the postannealed TiO2 nanotube arrays was oxygen-defective anatase. This kind of anatase nanotube arrays exhibited efficient electron field emission even at room temperature with a low applied electric field of ,9 V/,m. The emission current exceeded 70 ,A/cm2 at an extraction voltage of 700 V. [source] Electrochemically Tuned Properties for Electrolyte-Free Carbon Nanotube SheetsADVANCED FUNCTIONAL MATERIALS, Issue 14 2009Alexander A. Zakhidov Abstract Injecting high electronic charge densities can profoundly change the optical, electrical, and magnetic properties of materials. Such charge injection in bulk materials has traditionally involved either dopant intercalation or the maintained use of a contacting electrolyte. Tunable electrochemical charge injection and charge retention, in which neither volumetric intercalation of ions nor maintained electrolyte contact is needed, are demonstrated for carbon nanotube sheets in the absence of an applied field. The tunability of electrical conductivity and electron field emission in the subsequent material is presented. Application of this material to supercapacitors may extend their charge-storage times because they can retain charge after the removal of the electrolyte. [source] Electron Field Emission and Photoluminescence of Anatase Nanotube ArraysJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 12 2008Yang Yang TiO2 nanotube arrays with a high aspect ratio were grown on conductive Ti substrates by anodization in an organic electrolyte. The as-prepared TiO2 nanotubes were vertically grown and adhered well to the substrates. The photoluminescence spectrum and X-ray diffraction showed that the crystal structure of the postannealed TiO2 nanotube arrays was oxygen-defective anatase. This kind of anatase nanotube arrays exhibited efficient electron field emission even at room temperature with a low applied electric field of ,9 V/,m. The emission current exceeded 70 ,A/cm2 at an extraction voltage of 700 V. [source] | ||||||||||