Discrete Carbon Nanotube Array Discharge Ionization Source

A carbon nanotube array and discrete technology, which is applied in the field of ionization sources, can solve the problems of difficult production, reduced ionization source stability, and easy corrosion, and achieves reduced stability, small space occupation, and low corrosion resistance. Effect

Active Publication Date: 2016-05-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the discharge electrode of the corona discharge in the prior art is made of metal, which is not only difficult to produce, but also easily corroded, which reduces the stability of the ionization source, thereby providing a small curvature radius and good stability. Corroded Discrete Carbon Nanotube Array Discharge Ionization Source Using Carbon Nanotubes for Corona Discharge

Method used

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  • Discrete Carbon Nanotube Array Discharge Ionization Source
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Effect test

Embodiment 1

[0026] The structure of the discrete carbon nanotube array discharge ionization source of the present invention is as follows figure 1 As shown, it includes a power supply, the power supply provides a voltage of 1.5-5kV, one end of the power supply is connected to the carbon nanotube array discharge electrode, and the other end is connected to the counter electrode, and the counter electrode can be a grid electrode or a ring electrode. A channel through which the sample passes is formed between the carbon nanotube array discharge electrode and the counter electrode. The carbon nanotube array discharge electrode includes a base layer, and a discrete needle point array is arranged on the base layer. Straight-length single carbon nanotubes.

[0027] Its working principle is as follows: the sample gas enters between the counter electrode and the carbon nanotube array discharge electrode from the discharge channel, and after the power supply reaches 2kV, the carbon nanotubes begin ...

Embodiment 2

[0029] In the discrete carbon nanotube array discharge ionization source of the present invention, the base layer is preferably a silicon wafer, and a discrete needle tip array perpendicular to the silicon wafer is formed after deep reaction etching is adopted on the silicon wafer, so that The outer diameter of the discrete needle tip array is preferably 2 μm, the distance between the needle tip arrays is preferably 6 μm, and then single or multiple carbon nanotubes are vertically grown on the discrete needle tip array, Such as figure 2 Shown is a single carbon nanotube growing vertically; the radius of curvature of the end of the carbon nanotube is preferably 60 nm.

[0030] As other convertible implementations, the base layer can also be selected from other semiconductor materials, and the radius of curvature of the ends of the carbon nanotubes can also be selected between 20-90nm, and the radius of curvature in this range is larger than that of traditional The micron-leve...

Embodiment 3

[0032] image 3 It is a structural diagram of the actual application of the discrete carbon nanotube array discharge ionization source described in the present invention to an ion mobility spectrometer, and its principle is as follows:

[0033] The sample gas enters the discrete carbon nanotube array discharge ionization source from the gas inlet, and ionization occurs to form ions. The sample ions enter the front of the ion gate under the action of the electric field. When the ion gate is opened, different types of ions are According to the difference of ion mobility, the detector will amplify the signal to obtain the sample spectrum.

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Abstract

The invention relates to a discrete carbon nanotube array discharge ionization source, including a power supply; one end of the power supply is connected to a carbon nanotube array discharge electrode, and the other end is connected to a counter electrode, and the carbon nanotube array discharge electrode and the counter electrode A channel for the sample to pass is formed between them. The carbon nanotube array discharge electrode includes a base layer on which a discrete needlepoint array is arranged, and then single or multiple carbon nanotubes are vertically grown on the discrete needlepoint array. Tube. The present invention uses carbon nanotubes as electrodes for corona discharge, which avoids the prior art. The discharge electrodes of corona discharge are made of metal, which is not only difficult to produce and easily corroded, but also reduces the stability of the ionization source, thereby providing a curvature Discrete carbon nanotube array discharge ionization source with small radius, good stability and not easy to be corroded.

Description

technical field [0001] The invention relates to an ionization source, in particular to a discrete carbon nanotube array discharge ionization source, and belongs to the technical field of ionization. Background technique [0002] At present, ion mobility spectrometry has become one of the important methods for the detection of trace chemical substances in the field of analysis. Ion mobility spectrometry technology does not require a vacuum environment and can work directly under normal pressure. It has low power requirements and fast detection speed, so it is easy to make a small and portable instrument, especially suitable for on-site real-time detection and various online real-time analysis. [0003] The ion source is one of the key technologies of analytical instruments such as ion mobility spectrometry. Currently, the most widely used ion sources in ion mobility spectrometry are radioactive sources. The radioactive source mainly adopts 63Ni source which emits β-ray, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J49/16
Inventor 李灵锋汪小知李鹏
Owner ZHEJIANG UNIV
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