• 文献标题:   Effect of graphene oxide on in-situ surface growth of pure alpha-Si3N4 microbelts and their blue luminescent performance
  • 文献类型:   Article
  • 作  者:   CAO LS, GUO JD, WANG S, GAO CL, ZHANG WS, YANG DA
  • 作者关键词:  
  • 出版物名称:   CARBON
  • ISSN:   0008-6223 EI 1873-3891
  • 通讯作者地址:   Tianjin Univ
  • 被引频次:   1
  • DOI:   10.1016/j.carbon.2019.07.063
  • 出版年:   2019

▎ 摘  要

In-situ surface grown pure alpha-Si3N4 microbelts have been successfully obtained by graphene oxide-assisted pyrolysis of polyvinylsilazane at 1550 degrees C under H-2/N-2 atmosphere. The alpha-Si3N4 microbelts are 10-500 mu m length, similar to 500 mu m thickness and similar to 5 mu m width with smooth surface. The surface growth mechanism of alpha-Si3N4 microbelts is supposed to be vapor-solid growth. GO addition promotes not only the formation of Si-O bond and free carbon at 1000 degrees C but also the reaction to SiC and N-2 at 1550 degrees C. GO as an additive increases the yield of alpha-Si3N4 microbelts. The photoluminescence (PL) spectra of alpha-Si3N4 microbelts contain two emission peaks at 421 nm and 441 nm at room temperature. (C) 2019 Elsevier Ltd. All rights reserved.