Solvothermal synthesis method of nickel cobaltate nano particles
A nanoparticle and synthesis method technology, applied in cobalt compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of poor dispersion, difficult dispersion, uneven particle distribution, etc., and achieve difficult agglomeration, uniform size, high The effect of dispersion
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Embodiment 1
[0021] Mix 2ml 0.5mol / L nickel acetate and 4ml 0.5mol / L cobalt acetate solution, add it to 10ml n-propanol, then add 28% (weight) concentrated ammonia water to adjust pH=9, and the solvent will be at 220℃ After 6h of thermal reaction, nickel cobaltate nanoparticles can be obtained. Such as figure 1 As shown in the middle curve 1, all the diffraction peaks can correspond to the standard spinel peaks at the bottom. It can be seen that the obtained nickel cobaltate particles are cubic phase pure spinel structure, according to the Scherer formula D=κ ·Λ / βcosθ,κ is the Scherrer constant, generally taken as 0.89; λ is the X-ray wavelength, which is 0.154056nm in this embodiment; β is the half-width of the diffraction peak, that is, half the height from the top to the bottom of the peak The width of the place is measured and converted into radians; θ is the diffraction angle. It can be estimated that the grain size D is about 10 nm. Since the particle size of the material is smalle...
Embodiment 2
[0023] Mix 2ml 0.5mol / L nickel acetate and 2ml 1.0mol / L cobalt acetate solution, add them to 12ml n-butanol, then add 28% concentrated ammonia to adjust pH=9, and solvothermally react at 220℃ for 6h , You can get nickel cobaltate nanoparticles. Such as figure 1 As shown in the middle curve 2, all diffraction peaks can correspond to the standard spinel peaks at the bottom. It can be seen that the obtained nickel cobalt oxide particles are cubic phase pure spinel structure. According to the Scherer formula, the crystal structure can be estimated. The particle size is about 11 nm.
Embodiment 3
[0025] Mix 2ml 1.0mol / L nickel acetate and 4ml 1.0mol / L cobalt acetate solution, add it to 10ml n-propanol, add 20% concentrated ammonia to adjust pH=10, and solvothermally react at 200℃ for 24h , You can get nickel cobaltate nanoparticles. Such as figure 1 As shown in the middle curve 3, all diffraction peaks can correspond to the standard spinel peaks at the bottom. It can be seen that the obtained nickel cobaltate particles are cubic phase pure spinel structure, and the crystal structure can be estimated according to the Scherer formula. The particle size is about 10 nm. figure 2 It is a transmission electron micrograph of the prepared nickel cobaltate nanoparticles (JEOL 2010 high-resolution transmission electron microscope scanner, 100kV). Such as figure 2 As shown, the nickel cobaltate nanoparticles obtained in this embodiment are relatively uniform, have a narrow particle size distribution, basically about 10 nm, and have good dispersibility.
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