Azotized carbon nano cones and method for preparing same

A nano-cone and nano-technology, applied in the direction of nitrogen and non-metallic compounds, etc.

Inactive Publication Date: 2010-06-23
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there have been reports in the literature on the preparation of graphite nanocones, diamond nanocones, and nitrogen-implanted diamond nanoco

Method used

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  • Azotized carbon nano cones and method for preparing same
  • Azotized carbon nano cones and method for preparing same
  • Azotized carbon nano cones and method for preparing same

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preparation example Construction

[0023] A nitrided nanocone comprising β-C 3 N 4 , graphite phase C 3 N 4 and CN x ; Among them, x is a positive integer or decimal. Its preparation method comprises the following steps:

[0024] (1) First, a layer of 10-100 nanometer intermediate layer is deposited on the surface of a smooth substrate material in a vacuum chamber, and the process of depositing the intermediate layer adopts a pulsed laser ablation method;

[0025] The material of the intermediate layer is selected from one of cobalt / nickel, cobalt / iron, cobalt, nickel or iron,

[0026] (2) Next, heating the substrate to 280-300 degrees Celsius to allow it to cool naturally;

[0027] (3) Again, the substrate obtained in step (2) is placed on a graphite base in a vacuum chamber, an atomic beam source is arranged above the graphite base, and methane with a volume ratio of 1 / 20 to 1 / 150 / Nitrogen mixed gas is passed into the atomic beam source, and when the internal pressure of the atomic beam source reaches...

Embodiment 1

[0035] The parameters of the preparation process are as follows:

[0036] Anode-cathode spacing: 0.6 cm, cathode lead hole size: length 0.12 cm, diameter 0.2 cm, vacuum chamber background vacuum: 10-7 Torr, atomic beam source pressure: 30 Torr, vacuum chamber pressure: 3 Torr, discharge current: 150 mA, discharge voltage: 150 V, Co / Ni transition layer thickness: 100 nm, methane / nitrogen volume ratio: 1 / 50, deposition rate: 0.03 μm / min.

[0037] The composition and structure index of the synthesized carbon nitride nanocone:

[0038] The thin film is composed of nanoscale cone tip arrays perpendicular to the substrate;

[0039] The average bottom diameter is 500 nm, and the aspect ratio is 2:1;

[0040] β-C in nanocones 3 N 4 and graphite phase C 3 N 4 The composition ratio is 3:1;

[0041] The content of graphite and amorphous carbon in the cone is less than 5%.

Embodiment 2

[0043] The parameters of the preparation process are as follows:

[0044] Anode-cathode spacing: 0.6 cm, cathode lead hole size: length 0.12 cm, diameter 0.2 cm, vacuum chamber background vacuum: 10 -7 Torr, atomic beam source pressure: 30 Torr, vacuum chamber pressure: 3 Torr, discharge current: 150 mA, discharge voltage: 150 volts, Co / Ni transition layer thickness: 100 nm, methane / nitrogen volume ratio: 1 / 20, Deposition rate: 0.05 microns / min.

[0045] The composition and structure index of the synthesized carbon nitride nanocone:

[0046] The thin film is composed of nanoscale cone tip arrays perpendicular to the substrate;

[0047] The average bottom diameter is 100 nm, and the aspect ratio is 10:1;

[0048] β-C in nanocones 3 N 4 and graphite phase C 3 N 4 Composition ratio 1.5:1;

[0049] The composition of graphite and amorphous carbon in the cone is about 12%.

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Abstract

The invention provides an azotized carbon nano cones and a method for preparing the same. The azotized carbon nano cones comprise beta-C3N4 and graphite phase C3N4 and CNx, wherein x is a positive integer or decimal. The preparation method comprises the following steps of: (1) depositing a 10-100 nanometer metallic intermediate layer on the surface of a smooth substrate material in a vacuum cavity; (2) heating the substrate to the temperature of between 280 and 300 DEG C, and naturally cooling the substrate; (3) placing the substrate obtained by the step(2) on a graphite base in the vacuum cavity, placing an atomic beam source arranged above the graphite base, filling methane/nitrogen mixed gas, of which the volume ratio is one twentieths to one hundred and fiftieths, in the atomic beam source; and (4) keeping the discharge voltage of the atomic beam source between 100 and 300 volts and the air pressure in the atomic beam source between 3 and 100 torr, and obtaining the azotized nano cone, wherein the deposition rate is 0.01 to 0.1 micrometers per minute, and the deposition time is 5 to 45 minutes.

Description

【Technical field】 [0001] The invention belongs to the technical field of film preparation, and in particular relates to a carbon nitride nano cone and a preparation method thereof. 【Background technique】 [0002] Since Liu and Cohen of the University of California, Berkeley in 1990 theoretically expected the existence of a kind of β-C whose hardness may exceed the metastable phase of diamond. 3 N 4 (a lattice structure of carbon nitride), the study of such materials has been a hot spot in material science research. There are 5 possible structures of carbon nitride in theory, namely α phase, β phase, cubic phase, quasi-cubic phase and graphitic phase C 3 N 4 . Among the five C3N4 phases, except for the graphite-like phase, the hardness of the other four phases (elastic modulus is 427-483 GPa) is close to or exceeds that of diamond (theoretical value is 435 GPa, and the experimental value is 443 GPa). . In addition to high hardness and high elasticity, carbon nitride als...

Claims

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Application Information

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IPC IPC(8): C01B21/082
Inventor 许宁胡巍许晓峰
Owner FUDAN UNIV
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