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Method for preparing dendritic sulfur nano structure
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A nanostructure and dendritic technology, which is applied in nanostructure manufacturing, sulfur preparation/purification, nanotechnology, etc., to achieve mild reaction, simple operation and stable performance
Inactive Publication Date: 2012-01-25
SOUTHWEST JIAOTONG UNIV
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However, there is no simple and effective preparation method for dendritic sulfur nanostructures.
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Embodiment 1
[0022] A kind of preparation method of dendritic sulfur nanostructure, its concrete practice is:
[0023] a. Prepare mixed solution
[0024] The concentration of preparing sodium thiosulfate pentahydrate is 0.1mol / L, zinc nitrate hexahydrate, and the concentration of hexamethylenetetramine are a mixed solution of 0.00625mol / L;
[0025] b. heating
[0026] Take the mixed solution and incubate at 100°C for 2 hours;
[0027] c. Ultrasonic filtration
[0028] The solution obtained after the reaction in step b is ultrasonicated for 5 minutes, filtered, and the filtrate is dropped on a carbon-sprayed copper grid dedicated to transmission electron microscopy, and dried.
[0029] figure 1 It is a transmission photo (TEM) of the dendritic sulfur nanostructure prepared in Example 1 of the present invention, by figure 1 It can be seen that the obtained product is a dendritic nanostructure, and "trunks, branches, and leaves" can be clearly seen, and the size is about 50-100 nanometer...
Embodiment 2
[0033] The specific approach in this example is:
[0034] a. Prepare mixed solution
[0035] The concentration of preparing sodium thiosulfate pentahydrate is a mixed solution of 0.11mol / L, zinc nitrate hexahydrate, and hexamethylenetetramine concentrations of 0.00625mol / L;
[0036] b. heating
[0037] Take the mixed solution and incubate at 100°C for 2.5 hours;
[0038] c. Ultrasonic filtration
[0039] Ultrasonic the solution obtained after step b reaction for 8 minutes, filter, take the filtrate and drop it on a carbon-sprayed copper grid dedicated for transmission electron microscopy, and dry it to obtain it.
[0040] figure 2 It is the transmission photo (TEM) of the dendritic sulfur nanostructure prepared in Example 2 of the present invention, by figure 2 It can be seen that the obtained product is a dendritic nanostructure, and "trunks, branches, and leaves" can be clearly seen.
Embodiment 3
[0042] The specific approach in this example is:
[0043] a. Prepare mixed solution
[0044] The concentration of preparing sodium thiosulfate pentahydrate is a mixed solution of 0.125mol / L, zinc nitrate hexahydrate, and hexamethylenetetramine concentrations of 0.007mol / L;
[0045] b. heating
[0046] Take the mixed solution and incubate at 150°C for 2.5 hours;
[0047] c. Ultrasonic filtration
[0048] Ultrasonic the solution obtained after step b reaction for 6 minutes, filter, take the filtrate and drop it on a carbon-sprayed copper grid dedicated to transmission electron microscopy, and dry it to obtain it.
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Abstract
The invention discloses a method for preparing a dendritic sulfur nano structure, which comprises the following steps of: a, preparing mixed solution of which the concentration of sodium hyposulphite pentahydrate is between 0.1 and 0.125 mol / L and the concentrations of zinc nitrate hexahydrate and hexamethylene tetramine are same and between 0.00625 and 0.007 mol / L; b, keeping the temperature of the mixed solution between 100 and 150 DEG C for 2 to 2.5 hours; and c, performing ultrasonic treatment on the solution obtained after the reaction in the step b for 5 to 8 minutes, filtering the solution, dropping the filtrate on a carbon injection copper mesh special for a transmission electron microscope, and drying the carbon injection copper mesh to obtain the structure. The method has simpleequipment and low energy consumption and is suitable for large-scale production; simultaneously, the dendritic sulfur nano structure prepared by the method can be used as a template and a reaction medium used for synthesizing other inorganic dendritic sulfide nano materials such as CuS, CdS, CdS, ZnS, PbS and the like, the synthesizing steps are fewer, the operation is simple, and the prepared objects are good in performance.
Description
technical field [0001] The invention relates to a method for preparing a dendritic sulfur nanostructure. Background technique [0002] The non-metal element sulfur is a typical electron and ion insulator, the oxidation number of sulfur element can be from -2 to +7, assuming that the electron transfer number of each sulfur atom is 2, using Li 2 The reversible conversion between S and S can be widely used in Li / S secondary batteries. Its specific capacity is as high as 1675mAh / g, the theoretical voltage is 2.287V, and the theoretical energy density is 3824Wh / kg, which is the highest specific capacity among the positive electrode materials currently known. [0003] Recently, a large number of sulfur nanomaterials have been fabricated, including nanobelts, nanowires, nanorods, and hollow sulfur microspheres. As a special supramolecular structure, dendritic nanostructures have many characteristics, such as large surface area, excellent connectivity, etc. It will benefit a lot t...
Claims
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