2results about How to "Achieve continuous growth" patented technology

The application discloses high-quality bismuth-based perovskite monocrystals and a preparation method and application thereof. The preparation method of the high-quality bismuth-based perovskite monocrystals comprises the following steps: S1, preparing a single crystal growth precursor solution of the bismuth-based perovskite; S2, performing heat aging treatment on the prepared single crystal growth precursor solution; and S3, controlling the single crystal growth precursor solution after the heat aging treatment to crystallize and grow the bismuth-based perovskite monocrystals. The heat aging process of the precursor solution can obviously reduce the nucleation rate, effectively improve the crystallization quality, and finally obtain large-size high-quality bismuth-based perovskite monocrystals. The method has the advantages of simple process, strong operability, mild growth conditions, low required temperature, energy saving, low equipment requirement, low cost, high success rate, no need of additional seed crystals, and continuous growth of large-size high-quality perovskite monocrystals.

This invention relates to the field of carbon nanotube preparation technology, and discloses a controllable FCCVD method for preparing high-quality single-walled carbon nanotubes based on a methanol / ethanol mixed solvent. The method uses methanol and ethanol at a mass ratio of 1:0.5–1:3 as a composite carbon source, ferrocene as a catalyst precursor, and thiophene as a growth promoter to prepare a precursor solution. Single-walled carbon nanotubes are continuously grown at 1100–1300°C under a hydrogen atmosphere via floating catalyst chemical vapor deposition. This invention achieves a dynamic balance between the carbon supply rate and the amorphous carbon oxidation etching rate by precisely controlling the specific ratio of methanol to ethanol, thereby continuously producing single-walled carbon nanotubes with uniform diameter, extremely high graphitization degree, and high yield. Compared with existing technologies, this invention solves the contradiction of low yield or many defects with a single carbon source, avoids product quality degradation caused by improper ratios, and has a significant synergistic effect.