Monodisperse nanosheets and/or nanorings and their preparation and application

A monodisperse, nanosheet technology, applied in the field of nanomaterials, can solve the problems of high cost, complex process, limitations, etc., and achieve the effects of low cost, good repeatability and adjustable size

Active Publication Date: 2016-09-21
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical etching technology requires special templates and large-scale equipment, and is limited by complex processes and high costs
The chemical synthesis method has the advantages of low cost, simple operation and high yield, but it is generally only suitable for the synthesis of special materials and specific nano-ring structures

Method used

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  • Monodisperse nanosheets and/or nanorings and their preparation and application
  • Monodisperse nanosheets and/or nanorings and their preparation and application
  • Monodisperse nanosheets and/or nanorings and their preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] First mix 0.237g cobalt chloride hexahydrate (the amount of substance is 0.001mol, and the concentration is 5mM), 180mL distilled water, 20mL ethanol and 1.68g hexamethylenetetramine (the amount of substance is 0.012mol) [alkali and cobalt salt substance The ratio of the amount (referred to as alkali ratio) is 12:1] into a 400mL beaker, stirred for 10min, then put the beaker into an oil bath, reacted at 90°C for 1h, then cooled at room temperature, and finally washed, Filter and dry to obtain the monodisperse β-Co(OH) 2 Nanosheets. The resulting product is pink, and its phase and morphology, structure and selected area electron diffraction spectrum observed under a scanning electron microscope are as follows: Figure 1-3 shown. It can be seen that the product is a monodisperse regular hexagonal β-Co(OH) 2Nanosheets. The nano sheet has a single crystal structure, uniform size, clear edges and corners, and a side length of 1.51-3.27 μm.

Embodiment 2

[0036] The steps are the same as in Example 1, but the reaction temperature is 70°C. The resulting product is pink, and the morphology observed under the scanning electron microscope is as follows: Figure 4 As shown, it can be seen that the product is a monodisperse regular hexagonal β-Co(OH) 2 Nanosheets, uniform in size, rounded corners, side length 0.72-1.99 μm, thickness 0.12-0.26 μm.

Embodiment 3

[0038] The steps are the same as in Example 1, but the reaction temperature is 100°C. The resulting product is pink, and the morphology observed under the scanning electron microscope is as follows: Figure 5 As shown, it can be seen that most of the products are monodisperse regular hexagonal β-Co(OH) 2 Nanosheets, with clear borders, sharp edges and corners, and a side length of 1.0-1.92 μm.

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Abstract

The invention discloses a monodispersed nano-sheet and / or a nano-ring as well as preparation and application thereof. The monodispersed nano-sheet and / or the nano-ring comprise(s) the component of beta-Co(OH)2. The preparation method of the nano-sheet adopts a mixed solvent liquid phase precipitation method, namely: firstly, adding cobalt salt, distilled water, an organic solvent and alkali to a beaker in a stoichiometry ratio, wherein the volume ratio of the distilled water to the organic solvent is (3-9):1, the concentration of the cobalt salt is 2.5-10mM, and the weight ratio of the alkali to the cobalt salt is (6-24):1; then, mixing the cobalt salt, the distilled water, the organic solvent and the alkali for 10-20 min, and then performing a stirring and regurgitation reaction at the temperature of 70-100 DEG C for 0.5-2h; after cooling, performing washing, filtration and drying so as to obtain the monodispersed beta-Co(OH)2 nano-sheet. The monodispersed nano-sheet and / or the nano-ring, as well as the preparation and the application thereof, disclosed by the invention, are simple to operate and low in temperature, have low requirements for equipment, and are low in cost, high in efficiency, and easy to industrially apply and generalize.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a method for preparing monodisperse β-Co(OH) 2 A facile approach to nanosheets and nanorings. Background technique [0002] Layered cobalt hydroxide is a single metal hydrotalcite-like material, which has the same properties as conventional hydrotalcite materials, such as structural adjustment and anion exchange between layers. The unique properties of layered cobalt hydroxide make it have broad application prospects in lithium-ion batteries, catalysis, detection, adsorption, and magnetism. There are two problems in the process of producing cobalt hydroxide: (1) colloidal or flocs are easily formed during precipitation of cobalt hydroxide, which is difficult to filter; (2) cobalt hydroxide reacts incompletely under low alkaline conditions, and the impurity content is high , easily oxidized by oxygen in the air into brown-black Co(OH) 3 . Patent [CN101696039B] announced ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75C01G51/04B82Y40/00
Inventor 童国秀崔婷婷刘云倪镏柳吴文华
Owner ZHEJIANG NORMAL UNIVERSITY
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