• 专利标题:   Preparation of graphene sheets using supercritical fluid involves intercalating graphite oxide or expandable graphite with supercritical carbon dioxide and aqueous urea solution, and adding nitric acid dropwise by ultrasonic oscillation.
  • 专利号:   TW716226-B1, TW202124275-A
  • 发明人:   CHUNG M, KUAN H, HSU H
  • 专利权人:   CHUNG M, KUAN H, HSU H
  • 国际专利分类:   C01B032/192
  • 专利详细信息:   TW716226-B1 11 Jan 2021 C01B-032/192 202100 Pages: 18 Chinese
  • 申请详细信息:   TW716226-B1 TW146870 20 Dec 2019
  • 优先权号:   TW146870

▎ 摘  要

NOVELTY - A method for preparing a graphene sheet by using a supercritical fluid, comprising: providing graphite oxide or expandable graphite; performing a supercritical fluid intercalation step, wherein the graphite oxide or the expandable graphite and the urea aqueous solution are intercalated by a supercritical fluid, and then stir by nitric acid with ultrasonically oscillated and filtered. The urea nitrate intercalation graphite can be obtained. Finally it performs an microwave expansion step, wherein the graphene is obtained by the urea nitrate intercalated graphite at a predetermined temperature by microwave heating, and is pulverized by a pulverizer to obtain a graphene sheet.