Lanthanum hexaboride nanowire and method for preparing same

A technology of lanthanum hexaboride and nanowires, which is applied in the field of preparing lanthanum hexaboride nanowires, can solve the problems of poor shape, low output, and increased production costs, and achieve industrial production, high output, and easy operation Effect

Inactive Publication Date: 2012-08-01
XINYANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In (1) method, since BCl 3 Strong corrosiveness, so the output of the synthetic sample is low, and the morphology is not good; in the (2) method, because it is B 10 h 14 It is a solid that needs to be transported at high temperature, and it uses anhydrous LaCl 3 As a lanthanum source precursor and the use of Pt and Au catalysts will also increase production costs

Method used

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  • Lanthanum hexaboride nanowire and method for preparing same
  • Lanthanum hexaboride nanowire and method for preparing same
  • Lanthanum hexaboride nanowire and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Put the copper substrate into a small beaker, add a little ethanol, and ultrasonically clean it for 30 minutes; then add acetone to clean it; and finally dry it naturally in the air for use.

[0027] (2) Weigh about 0.1g of LaCl 3 *7H 2 O, put into the bottom of the small quartz test tube, and place the small quartz test tube in the middle of the quartz tube of the electric tube furnace.

[0028] (3) Put the aforementioned copper substrate on the quartz plate, and put the quartz plate into the downflow direction of the quartz tube precursor of the electric tube furnace; seal the quartz tube, fill it with protective and reducing gas, and then vacuumize the quartz tube.

[0029] (4) Heat the quartz tube to 900° C. at a heating rate of about 15° C. / min under vacuum conditions, and feed a boron source at a flow rate of 10 sccm; keep for 10 minutes.

[0030] (5) Finally, the temperature is lowered in a vacuum atmosphere until it is cooled to room temperature; the coppe...

Embodiment 2

[0033] (1) Put the copper substrate into a small beaker, add a little ethanol, and ultrasonically clean it for 30 minutes; then add acetone to clean it; and finally dry it naturally in the air for use.

[0034] (2) Weigh about 0.2g of LaCl 3 *7H 2 O, put into the bottom of the small quartz test tube, and place the small quartz test tube in the middle of the quartz tube of the electric tube furnace.

[0035] (3) Put the aforementioned copper substrate on the quartz plate, and put the quartz plate into the downflow direction of the quartz tube precursor of the electric tube furnace; seal the quartz tube, fill it with protective and reducing gas, and then vacuumize the quartz tube.

[0036] (4) Heat the quartz tube to 960° C. at a heating rate of about 15° C. / min under vacuum conditions, and feed a boron source at a flow rate of 30 sccm; keep for 20 minutes.

[0037] figure 2 is the X-ray diffraction (XRD) spectrum of the prepared sample. Diffraction peaks can be divided int...

Embodiment 3

[0043] (1) Put the copper substrate into a small beaker, add a little ethanol, and ultrasonically clean it for 30 minutes; then add acetone to clean it; and finally dry it naturally in the air for use.

[0044] (2) Weigh about 0.3g of LaCl 3 *7H 2 O, put into the bottom of the small quartz test tube, and place the small quartz test tube in the middle of the quartz tube of the electric tube furnace.

[0045] (3) Put the aforementioned copper substrate on the quartz plate, and put the quartz plate into the downflow direction of the quartz tube precursor of the electric tube furnace; seal the quartz tube, fill it with protective and reducing gas, and then vacuumize the quartz tube.

[0046] (4) Heat the quartz tube to 1020° C. at a heating rate of about 15° C. / min under vacuum conditions, and feed a boron source at a flow rate of 50 sccm; keep for 30 minutes.

[0047] (5) Finally, the temperature is lowered in a vacuum atmosphere until it is cooled to room temperature; the copp...

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Abstract

The invention discloses a method for preparing a lanthanum hexaboride nanowire on a copper substrate. The method comprises the following steps of: (1) cleaning the copper substrate, and removing oil stain from the copper substrate; (2) placing a lanthanum source in the middle of a quartz tube of an electric tube furnace, placing the copper substrate in the down gas flow direction of a precursor, sealing the quartz tube, filling protective and reduction gas, and vacuumizing the quartz tube and raising temperature; (3) heating the quartz tube to 900 to 1,020 DEG C, introducing diborane gas and reacting at constant temperature for 10 to 30 minutes; and (4) stopping introducing diborane, and reducing temperature at vacuum atmosphere. The method for preparing the lanthanum hexaboride nanowire on the copper substrate is simple, and any catalyst is not needed; and the prepared LaB6 nanowire can be used as a cold cathode electron source, and is applied to field electron emission flat-panel displays, cold cathode fluorescent tubes, field emission pressure sensors and the like, and has good application prospect in the aspect of field electron emission display materials.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a method for preparing lanthanum hexaboride nanowires on a copper substrate. Background technique [0002] Lanthanum hexaboride has the characteristics of low work function, low evaporation rate (at high temperature), high brightness, high chemical stability and high mechanical strength, so LaB 6 As an excellent cold cathode emission source, it is widely used in national defense industry and civil industry, such as scanning electron microscope, transmission electron microscope, field emission pressure sensor and other high-performance electron source devices. LaB 6 It has a low work function (2.6eV) and a low evaporation rate, which means that it has a lower operating voltage and a longer lifetime when it is used as a field emission electron source. The Fowler-Sondheim (FN) formula shows that the pointed cone made of materials with low work function and high aspect ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/04
Inventor 许军旗余本海王艳蕊王红军于永生董宝平侯广华
Owner XINYANG NORMAL UNIVERSITY
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