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Work function measuring method

一种测量方法、逸出功的技术，应用在测量装置、材料功函数电压、仪器等方向，能够解决阴极电极加热、逸出功准确度无法保证等问题，达到增强准确度、良好导电性的效果

Active Publication Date: 2008-01-16
TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the measurement of work function by thermionic emission method is limited to a large extent, it needs to heat the cathode electrode to a higher temperature, and when measuring the work function of various materials, the accuracy of the measured work function degree cannot be guaranteed

Method used

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Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] Please refer to FIG. 1 , a method for measuring work function provided by an embodiment of the present invention mainly consists of the following steps.

[0024] Step 1: Provide a carbon nanotube field emission electron source as a cathode and an anode disposed at a certain distance from the cathode, and the carbon nanotube field emission electron source uses a carbon nanotube as an electron emission terminal.

[0025] Referring to Fig. 2, the carbon nanotube field emission electron source 12 of the present embodiment comprises a conical conductive substrate 14 and a carbon nanotube 16 arranged on the conductive substrate 14, and one end of the carbon nanotube 16 is adsorbed on the carbon nanotube 16 due to van der Waals force. The top surface of the conductive base 14 is electrically connected to the conductive base 14 , and the other end extends outw...

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Abstract

The invention relates to a measuring method of work function which comprises the following steps: a carbon nanometer tube field eradiation electron source is a cathode, and an anode is provided in the preset distance to the cathode; voltage is exerted in the field eradiation electron source in the vacuum environment, and the field eradiation current-voltage curve is measured; one layer of field eradiation material of measured working function is formed on the surface of the carbon nanometer tube of the carbon nanometer tube field eradiation electron source; under the same condition of the same distance, the current-voltage curve of the carbon nanometer tube field eradiation electron source of the measured field eradiation material is measured; according to the Fowler-Nordheim equation and the current-voltage curve diagram which is measured, the Fowler-Nordheim curve sketch diagram of electron eradiated from the field eradiation electron source can be measured; furthermore, the working function of the measured eradiation material can be measured.

Description

technical field [0001] The invention relates to a method for measuring work function, in particular to a method for measuring work function of field emission materials. Background technique [0002] The surface of metal materials can emit free electrons under certain circumstances, and this phenomenon is called surface emission. The generation of free electrons is due to the electrons in the metal gaining energy, overcoming the internal attraction and escaping from the metal. The energy required for an electron to escape from a metal is called the work function, and its unit is electron volts (eV). The work function of different metal materials is not the same. The surface emission of metal materials can be generally divided into thermal emission and field emission according to the reasons. When the temperature of the metal rises to a certain value, the electrons on the surface can gain enough kinetic energy to overcome the internal attraction and escape from the metal su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N23/00
CPCG01N27/005
Inventor 魏巍姜开利范守善
Owner TSINGHUA UNIV
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