Title:
METHOD FOR PREPARING FERROMAGNETIC VO2 USING SUPERCRITICAL FLUID TECHNOLOGY
Document Type and Number:
WIPO Patent Application WO/2022/237151
Kind Code:
A1
Abstract:
The present invention belongs to the technical field of magnetic metal oxide preparation, and discloses a method for preparing ferromagnetic VO2 using supercritical fluid technology. Dispersing non-magnetic VO2 in a mixed solvent composed of N-methylpyrrolidone and water to obtain a dispersion; transferring the dispersion to a supercritical apparatus, injecting carbon dioxide into the supercritical apparatus, stirring and reacting for 3-6 h in supercritical conditions, naturally cooling to room temperature, and then depressurising; separating the system after supercritical treatment, collecting the separation liquid, and drying to obtain ferromagnetic VO2. The present invention breaks through traditional defect-induced local magnetic moments and uses a mixed solvent of N-methylpyrrolidone and water to treat non-magnetic VO2 in supercritical carbon dioxide conditions, and can generate a stronger and more stable magnetic response compared with a traditional defect-induced local magnetic moment; in the whole ferromagnetic structure induction process, the preparation technology is environmentally friendly and pollution-free, having great application prospects in the field of magneto-optical and magneto-electric devices.
Inventors:
XU QUN (CN)
ZHOU YANNAN (CN)
ZHOU YANNAN (CN)
Application Number:
PCT/CN2021/137184
Publication Date:
November 17, 2022
Filing Date:
December 10, 2021
Export Citation:
Assignee:
UNIV ZHENGZHOU (CN)
International Classes:
C01G31/02
Foreign References:
| CN113087019A | 2021-07-09 | |||
| CN102020314A | 2011-04-20 | |||
| CN102838164A | 2012-12-26 | |||
| CN104009215A | 2014-08-27 | |||
| US20190040526A1 | 2019-02-07 |
Other References:
ZHOU YANNAN; YAN PENGFEI; ZHANG SUOYING; MA CHAO; GE TIANPEI; ZHENG XIAOLI; ZHANG LI; JIANG JINGYUN; SHEN YONGLONG; CHEN JUN; XU Q: "Conversion of non-van der Waals VO2 solid to 2D ferromagnet by CO2-induced phase engineering", NANO TODAY, vol. 40, 20 August 2021 (2021-08-20), NL , pages 1 - 8, XP086810877, ISSN: 1748-0132, DOI: 10.1016/j.nantod.2021.101272
ZHANG LI, ZHOU YANNAN, ZHENG XIAOLI, JIANG JINGYUN, XU QUN: "Generation of 2D nonlayered ferromagnetic VO 2 (M) nanosheets induced by strain engineering of CO 2", CHEMICAL COMMUNICATIONS, vol. 57, no. 72, 4 August 2021 (2021-08-04), UK , pages 9072 - 9075, XP093003809, ISSN: 1359-7345, DOI: 10.1039/D1CC02269E
ZHOU YANNAN, XU QUN, GE TIANPEI, ZHENG XIAOLI, ZHANG LI, YAN PENGFEI: "Accurate Control of VS 2 Nanosheets for Coexisting High Photoluminescence and Photothermal Conversion Efficiency", ANGEWANDTE CHEMIE INTERNATIONAL EDITION, vol. 59, no. 8, 17 February 2020 (2020-02-17), pages 3322 - 3328, XP093003814, ISSN: 1433-7851, DOI: 10.1002/anie.201912756
ZHANG LI, ZHOU YANNAN, ZHENG XIAOLI, JIANG JINGYUN, XU QUN: "Generation of 2D nonlayered ferromagnetic VO 2 (M) nanosheets induced by strain engineering of CO 2", CHEMICAL COMMUNICATIONS, vol. 57, no. 72, 4 August 2021 (2021-08-04), UK , pages 9072 - 9075, XP093003809, ISSN: 1359-7345, DOI: 10.1039/D1CC02269E
ZHOU YANNAN, XU QUN, GE TIANPEI, ZHENG XIAOLI, ZHANG LI, YAN PENGFEI: "Accurate Control of VS 2 Nanosheets for Coexisting High Photoluminescence and Photothermal Conversion Efficiency", ANGEWANDTE CHEMIE INTERNATIONAL EDITION, vol. 59, no. 8, 17 February 2020 (2020-02-17), pages 3322 - 3328, XP093003814, ISSN: 1433-7851, DOI: 10.1002/anie.201912756
Attorney, Agent or Firm:
ZHENGZHOU YUKAI PATENT AGENCY (COMMON PARTNERSHIP) (CN)
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