Effective method for doping nitrogen into carbon nanotips

A cutting-edge and effective technology of carbon nanometer, applied in the direction of nanocarbon, nanotechnology, nanotechnology, etc., can solve problems such as influence and adverse effects, and achieve the effect of improving luminous efficiency

Inactive Publication Date: 2013-03-20
CHONGQING UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

However, the nickel catalyst does not match with microelectronics and optoelectro...

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  • Effective method for doping nitrogen into carbon nanotips
  • Effective method for doping nitrogen into carbon nanotips
  • Effective method for doping nitrogen into carbon nanotips

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Embodiment 1

[0038] Embodiment 1: A kind of effective doping method of nitrogen in carbon nano tip, deposit a layer of gold film on Si substrate as catalyst layer, with CH 4 、H 2 and N 2 As the reaction gas, an amorphous carbon nanotip was prepared; the thickness of the gold film was about 10 nm, the substrate temperature was 850 °C, CH 4 The flow rate is 20sccm (sccm means that the gas flows through 1cm per minute under standard conditions 3 ), H 2 The flow rate is 70sccm, N 2 The flow rate is 30 sccm, the working pressure of the reaction chamber is 2000 Pa, and the bias current is 160 mA.

[0039] Figure 3 ~ Figure 7 The scanning electron micrograph of the photo shows that the carbon nanotip is formed, and the gold particle is located on the tip of the tip. Transmission scanning electron micrographs show that the formed carbon nanotips are amorphous. X-ray photoelectron spectroscopy revealed nitrogen doping at the amorphous carbon nanotips. According to the fitting of the X-ray ...

Embodiment 2

[0040] Embodiment 2: A kind of effective doping method of nitrogen in carbon nano-tip, deposit a layer of gold film on Si substrate as catalyst layer, with CH 4 、H 2 and N 2 As the reaction gas, an amorphous carbon nanotip was prepared; the thickness of the gold film was about 10 nm (nm is nanometer), the substrate temperature was 850 °C, CH 4 The flow rate is 20sccm, H 2 The flow rate is 70sccm, N 2 The flow rate is 40 sccm, the working pressure of the reaction chamber is 2000 Pa, and the bias current is 160 mA.

[0041] see Figure 8 ~ Figure 12 , The second embodiment prepares relevant photos and X-ray photoelectron spectra of nitrogen-doped amorphous carbon nano-tips. The scanning electron micrograph shows that carbon nanotips are also formed under this growth condition, with gold particles on top of the tips. Transmission scanning electron micrographs show that the formed carbon nanotips are amorphous. X-ray photoelectron spectroscopy revealed nitrogen doping at th...

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Abstract

The invention provides an effective method for doping nitrogen into carbon nanotips, which comprises the following steps: depositing a gold film on an Si substrate as a catalyst layer; and by using CH4, H2 and N2 as reactant gases, effectively doping nitrogen into the carbon nanotips in the process of preparing the carbon nanotips by chemical vapor deposition by reinforcing a hot wire with plasma, wherein the gold film is 5-30nm thick; in the reactant gases, the concentration of the CH4 is 15-20%, the concentration of the H2 is 50-65%, and the concentration of the N2 is 15-40%; the temperature of the substrate is 800-900 DEG C; the working pressure of the reaction chamber is 1500-3000Pa; the bias current is 120-160mA; and the growth time is 20-30 minutes. The carbon nanotips prepared by using the gold catalyst layer are amorphous carbon nanotips with the nitrogen content of higher than 11%, and have the components sp3C-N and sp2C-N. Particularly, the invention detects that the gold catalyst particles are positioned on the top ends of the carbon nanotips, thereby overcoming the difficulty in preparing electrodes at the top ends of the carbon nanotips, and laying foundation for application of light-emitting diodes (LEDs). The carbon nanotips can be used as a candidate material for preparation and photocatalysis of white LEDS and field electron emitters.

Description

technical field [0001] The invention relates to an effective doping method of nitrogen in carbon nano-tips, in particular to the selection of catalysts and the nitrogen-doped amorphous carbon nano-tips prepared with a gold catalyst layer. [0002] Background technique [0003] Carbon nanotips are new carbon nanomaterials discovered in recent years, and their shape is similar to that of a cone. So far, three structures of carbon nanotips have been found, namely tubular carbon nanotips, carbon nanotips stacked by graphene sheets perpendicular to the growth direction, and amorphous carbon nanotips. They have good electrical and mechanical properties such as low field electron emission turn-on electric field and high Young's modulus, and are very suitable for use as materials in fields such as field electron emitters, scanning probe tips, and nanolithography. [0004] Among the carbon nanotips of the above three structures, the amorphous carbon nanotips are made of sp 3 C-C...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82Y30/00C09K11/65B01J27/24H01J1/304C01B32/15
CPCY02B20/181Y02B20/00
Inventor 王必本全学军
Owner CHONGQING UNIV OF TECH
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