Method for preparing monodisperse nano hollow carbon sphere with controllable size and shape
A monodisperse and hollow technology, which is applied in the field of preparation of monodisperse nano hollow carbon spheres, can solve the problems of difficulty in obtaining target hollow carbon spheres with uniform size, difficulty in controlling template uniformity, and inability to convert hollow carbon spheres. Controllable morphology, high product yield and high purity
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Embodiment 1
[0026] Weigh 2.5mmol dihydroxybenzoic acid and 7.5mmol formaldehyde, then they are dissolved in 95ml deionized water to form solution A, and then 0.18mmol carboxylic acid surfactant octadecenoic acid is dissolved in 5ml concentration of 1wt% dilute A solution B was obtained in ammonia water, and then the two solutions A and B were mixed, stirred slowly for 30 minutes, transferred to a reaction kettle, and reacted hydrothermally at 100° C. for 4 hours. Then cool to room temperature naturally. The product was centrifuged, washed twice with water and once with ethanol, and then dried in an oven at 50°C for 6 hours to obtain hollow polymer spheres. Then the obtained hollow polymer spheres were subjected to SiO 2 Embedding, the embedding thickness is 40nm, carbonization at 800°C for 4h, and removal of SiO 2 layer to obtain hollow carbon spheres. figure 1 (a) The TEM image of the hollow polymer sphere prepared in this example, it can be seen from the figure that the sample has a ...
Embodiment 2
[0028] Hydrothermal reaction temperature is 120 ℃, and other conditions are with embodiment 1, figure 1 (b) is a TEM picture of the hollow polymer sphere prepared in this example, the outer diameter of the hollow polymer sphere is 210±10 nm, and the cavity size is 50±5 nm.
[0029] image 3 Middle (a) is the hollow polymer sphere SiO prepared in this embodiment 2 Embedded TEM picture, (b) is the TEM picture of the hollow carbon sphere obtained in this embodiment. It can be seen from (b) that the size of the carbon spheres shrinks to 180±10nm after carbonization, and then the cavity expands slightly to 60±5nm.
[0030] The nitrogen adsorption isotherm of the hollow carbon spheres that present embodiment makes is as follows Figure 4 , where the curve (a) is the adsorption isotherm of the sample after carbonization at 800℃, and its S BET =558m 2 / g,V total =0.44cm 3 / g, (b) and (c) correspond to the adsorption isotherms after activation for 2h and 3h, respectively, and th...
Embodiment 3
[0032] The hydrothermal reaction temperature is 140°C, and other conditions are the same as in Example 1. The TEM image of the resulting hollow polymer sphere is as follows figure 1As shown in (c), the outer diameter is still 210±10nm, and the inner diameter increases to 70±5nm.
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