Method for preparing nanometer hollow carbon spheres with dopamine serving as carbon source

Abstract

The invention discloses a method for preparing nanometer hollow carbon spheres with dopamine serving as the carbon source. The method includes the steps of firstly, preparing SiO2 nanometer spheres through a method (please see the method in the description); secondly, directly adding dopamine to a reaction system, and preparing SiO2Pdop by wrapping dopamine on the surfaces of SiO2 through in situ polymerization; thirdly, roasting the prepared SiO2Pdop under the atmosphere of nitrogen to obtain SiO2Carbon; fourthly, dispersing the prepared SiO2Carbon in an ammonia water solution to be etched. By means of the method, preparation of the SiO2 nanometer spheres and wrapping of dopamine are completed through a one-pot method, the preparation cycle is shortened, the energy consumption is saved, operation is easy, large-scale production can be easily achieved, nanometer hollow carbon spheres which are uniform in size, controllable in shell thickness and particle size and stable in morphology structure can be prepared, and application prospects are wide.

Description

Technical field [0001] The invention relates to a method for preparing nano hollow carbon spheres using dopamine as a carbon source, and belongs to the technical field of nano material preparation. Background technique [0002] Due to the small size effect, nanomaterials have many unique properties and special applications. The high specific surface area makes them highly expected in the fields of high-efficiency catalysts, hydrogen storage materials, and low melting point materials. The changes in the morphology of nanomaterials also cause significant changes to the physical properties of the material itself. For example, nanomaterials have a low light reflection coefficient, can efficiently convert solar energy into electric energy and heat, and as an additive, they can also enhance toughness and strength. Features. Nanomaterials have huge application space and potential value in the fields of electronics, magnetism, acoustics, etc. At the same time, nanomaterials are also wid...

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Problems solved by technology

[0007] (1) Using SiO purchased directly from the market 2 Nanospheres: This approach eliminates SiO 2 The preparation of nanospheres thus saves the preparation time of hollow carbon spheres, however, with commercially purchased SiO 2 Nanospheres cannot meet the requirements of SiO in experiments 2 Due to the flexible requirements of nanospheres, the prepared hollow carbon spheres are relatively simple, which cannot meet the needs of experiments or market diversification;

[0008] (2) Using SiO prepared in the laboratory 2 Nanospheres: This method can directly prepare different SiO according to experimental requirements 2 Nanospheres are relatively flexible; however, when using this method, in order to ensure that SiO 2 The mass of nanospheres and the effect of dopamine modification on SiO 2 After the nanospheres are generated in the reaction solution, the prepared SiO 2 The nanospheres are separated, and then they are subjected to a series of cleaning, drying and other treatments, and finally the processed SiO 2 The nanospheres react with dopamine, so that the preparation of hollow carbon spheres needs to be completed in two steps. This method inevitably wastes a lot of time and reagents, resulting in a double loss of time and energy.

[0009] Secondly, when preparing hollow carbon spheres, HF is usually used as an etchant for SiO in the etching step. 2 Nanospheres are etched, because HF is a highly corrosive and highly toxic substance, volatile, and harmful to the human body and the environment, so it is not conducive to large-scale preparation

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