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Single-crystal tellurium nanotube and preparation method and application thereof

A tellurium nanometer and single crystal technology, applied in the field of thermoelectric nanometer semiconductor materials, can solve the problems of unsuitability for large-scale industrial production, long reaction time, unfavorable environment, etc., and achieve easy control of size and shape, short reaction time and low energy consumption Effect

Inactive Publication Date: 2013-10-16
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the hydrothermal method and solvothermal method can be used to synthesize tellurium nanotubes with uniform size and controllable length, the reaction process requires a high-pressure reactor, the process is relatively complicated, the reaction time is long, the output is too low, and the energy consumption is too large, so it is not suitable for Large-scale industrial production, and the use of toxic substances such as formamide and hydrazine hydrate as reducing agents in the synthesis process will inevitably introduce factors that are unfavorable to the environment

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  • Single-crystal tellurium nanotube and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Raw materials: analytically pure TeO 2 , absolute ethanol, ethylene glycol (PG).

[0039] 1. Add 0.4788g (3mmol) of TeO 2 and 0.6g of PVP k-30 (Mw=40000) were dispersed in 50ml of ethylene glycol, and then the mixture was transferred to a three-necked flask with a capacity of 100ml, magnetically stirred and heated to 135°C, the solution consisted of a milky white suspension It gradually becomes a colorless and transparent clear solution.

[0040] 2. Continue to stir and heat up to 200°C, add 0.3g of NaOH to the three-necked flask, the clear solution gradually turns into a gray-black solution, keep the temperature at 200°C for 25 minutes, and then naturally cool to room temperature (this process is always about 20r / s stirring rate).

[0041] 3. Centrifuge the gray-black solution at a speed of 8500 rpm, pour off the upper liquid, and then use absolute ethanol to ultrasonically disperse the lower precipitate, and then perform centrifugal separation. Repeat the above ste...

Embodiment 2

[0044] Raw material: analytically pure TeO 2 , absolute ethanol, ethylene glycol (PG).

[0045] 1. Add 0.9576g (6mmol) of TeO 2 and 1.2g of PVP k-30 (Mw=40000) were dispersed in 100ml of ethylene glycol, and then the mixture was transferred to a three-necked flask with a capacity of 250ml, magnetically stirred and heated to 135°C, the solution consisted of a milky white suspension It gradually becomes a colorless and transparent clear solution.

[0046] 2. Continue to stir and heat up to 200°C, add 0.6g of NaOH to the three-necked flask, the clear solution gradually turns into a gray-black solution, keep the temperature at 200°C for 25 minutes, and then cool naturally to room temperature (this process is always about Stirring rate of 1200r / min).

[0047] 3. Centrifuge the gray-black solution at a speed of 8500 rpm, pour off the upper liquid, and then use absolute ethanol to ultrasonically disperse the lower precipitate, and then perform centrifugal separation. Repeat the ab...

Embodiment 3

[0050] The steps are the same as Example 1, the difference is that step 2) continue to stir and raise the temperature to 185°C, add 0.3g of NaOH to the three-necked flask, the clear solution gradually turns into a gray-black solution, and keep the temperature at 185°C for 25 minutes. The obtained experimental results are slightly different from Example 1. The length is about 5 μm, the diameter is about 171 nm, and the wall thickness is about 30 nm. The surface of the tellurium nanotubes is rough and uneven, indicating that lowering the synthesis temperature will reduce the reaction rate, which is not conducive to the full reaction of various substances. , the synthesized tellurium nanotubes are small in size and rough in surface.

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Abstract

The invention relates to a single-crystal tellurium nanotube and a preparation method and application thereof. The preparation method of the single-crystal tellurium nanotube comprises the steps as follows: adding tellurium dioxide and poly vinyl pyrrolidone (PVP) into a glycol solution; agitating and heating the mixture till clarification; continuously heating the mixture to 180-230 DEG C; adding sodium hydroxide into the mixture and agitating for 5-60 minutes at the temperature of 180-230 DEG C to obtain the tellurium nanotube, wherein the weight ratio of the tellurium dioxide, the poly vinyl pyrrolidone (PVP), glycol and the sodium hydroxide is (0.16-0.64):(0.2-0.8):(55-112):(0.05-0.8). The prepared single-crystal tellurium nanotube is 170-460 nanometers in diameter, about 5.0-9.0 microns in length and 30-40 nanometers in wall thickness. The single-crystal tellurium nanotube can service as an in-situ template for compounding PbTe pyroelectricity nanotubes, Bi2Te3 pyroelectricity nanotubes and Sb2Te3 pyroelectricity nanotubes.

Description

technical field [0001] The invention relates to a thermoelectric nano-semiconductor material, in particular to a single-crystal tellurium nanotube and its preparation method and application. Background technique [0002] Thermoelectric materials are a class of special functional materials that can realize direct conversion of thermal energy and electrical energy. Devices based on this type of material will not cause any incidental pollution to the environment during the energy conversion process, and have the advantages of small size, no noise, and easy processing. The advantage is that it is one of the ideal choices for heat recovery and utilization. If thermoelectric devices can be popularized and applied, it will undoubtedly greatly improve the use efficiency of mineral energy. Since Thomas Seebeck first discovered the thermoelectric effect in 1823, thermoelectric materials have successively passed through the stages of metal, alloy, and semiconductor. The research and a...

Claims

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Application Information

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IPC IPC(8): C01B19/02B82Y30/00
Inventor 郑树启李志亮张愈茁滕仁园黄婷陈长风卢贵武
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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