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Method for synthesizing elemental selenium nano-belt

A synthesis method and elemental selenium technology, applied in the field of nanomaterials, can solve the problems of using surfactants, complex processes, and high equipment requirements, and achieve the effects of convenient operation, simple process route, and large aspect ratio.

Inactive Publication Date: 2012-05-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods still have many problems and deficiencies such as high equipment requirements, complex processes, and the use of surfactant-oriented, and it is urgent to develop a safe, usable, and simple selenium nanoribbon synthesis technology

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  • Method for synthesizing elemental selenium nano-belt
  • Method for synthesizing elemental selenium nano-belt
  • Method for synthesizing elemental selenium nano-belt

Examples

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preparation example Construction

[0014] The invention discloses a method for synthesizing elemental selenium nanobelts, which uses sodium selenite as a selenium source and β-cyclodextrin as a reducing agent to prepare elemental selenium nanobelts in one step through hydrothermal reaction in an aqueous solution system. Specific steps are as follows:

[0015] The first step: dissolving commercially available sodium selenite and β-cyclodextrin with a molar ratio of 1:0.5 to 1:5 in distilled water to form a colorless and transparent solution; Add distilled water to 50-80% of the total volume in an ethylene-lined stainless steel reaction kettle, seal and tighten.

[0016] Step 2: Put the reaction kettle into a constant temperature oven, set the reaction temperature to 140-180°C, and the reaction time to 6-18 hours.

[0017] The third step: centrifuging the product obtained in the second step, and washing with distilled water and absolute ethanol for 3 to 5 times respectively. Finally, vacuum dry in a vacuum oven...

Embodiment 1

[0020] Prepare a mixed solution of sodium selenite and β-cyclodextrin with a molar ratio of 1:2, weigh 0.005mol of analytically pure sodium selenite and 0.01mol of β-cyclodextrin and dissolve them in distilled water, and transfer the resulting clear solution to a polymer In a stainless steel autoclave lined with tetrafluoroethylene, add distilled water to 80% of the total volume. After fully stirring, tighten the autoclave and put it into a constant temperature oven at 160°C for 12 hours. After the reaction was over, the reactor was taken out and allowed to cool naturally. Subsequently, the precipitate in the kettle was filtered, washed three times with distilled water, and then washed twice with absolute ethanol. Finally, the sample was dried in a vacuum oven at 60° C. for 4 hours to obtain elemental selenium nanobelts. figure 1 For the X-ray diffraction spectrum of the elemental selenium nanobelt prepared in this embodiment, all diffraction peaks in the figure can be index...

Embodiment 2

[0022] Prepare sodium selenite and β-cyclodextrin with a molar ratio of 1:0.5 and dissolve them in distilled water, transfer the resulting clear solution to a polytetrafluoroethylene-lined stainless steel autoclave, and add distilled water to 80% of the total volume. After fully stirring, tighten the autoclave and put it in a constant temperature oven at 140°C for 18 hours. After the reaction was over, the reactor was taken out and allowed to cool naturally. Subsequently, the precipitate in the kettle was filtered, washed three times with distilled water, and then washed twice with absolute ethanol. Finally, the sample was dried in a vacuum oven at 50° C. for 6 hours to obtain elemental selenium nanobelts. Elemental selenium has a nanometer bandwidth of 60-80nm, a thickness of 10-20nm, and a length of more than tens of microns.

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Abstract

The invention discloses a method for preparing an elemental selenium nano-belt through liquid phase reduction. The method comprises the following steps of: using sodium selenite as a selenium source; using oligosaccharide beta-cyclodextrin as a reducing agent; and preparing a one-dimensional elemental selenium nano-belt by one step through a hydro-thermal reaction. In the reaction process, a surfactant and any other template is not added, the hydro-thermal reaction is performed for 6 to 18 hours at the temperature of between 140 and 180 DEG C to prepare an elemental selenium mono-crystal nano-belt of which the width is 50 to 80 nanometers, the thickness is 10 to 30 nanometers and the length is more than tens of microns, and the materials are crystallized in good condition. The reducing capacity of the beta-cyclodextrin and a hydro-thermal reaction system provide a suitable environment for the full growth of elemental selenium in a one-dimensional direction. The method has the characteristics of simple process route, convenient operation, environment-friendly reducing agent and the like.

Description

technical field [0001] The invention belongs to the field of nanometer materials, in particular to a preparation method of elemental selenium nanobelts. Background technique [0002] Elemental selenium is an important elemental semiconductor material with low melting point (~490K) and high optical conductivity (~8×10 4 S cm -1 ), high chemical activity and nonlinear optical response, etc., can be used in optoelectronics fields such as solar cells, rectifiers, and toner cartridges, and is also the preferred material for the synthesis of other selenides. In recent years, one-dimensional nanomaterials (such as nanowires, nanorods, nanoribbons, and nanotubes) have become a hot spot in nanomaterials research and attention due to their superior physical and chemical properties and their potential applications in the field of nanodevices. [0003] The methods for synthesizing elemental selenium one-dimensional nanomaterials usually include liquid phase synthesis technology, vapor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/02
Inventor 王雄林颖郇宇
Owner NANJING UNIV OF SCI & TECH
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