摘要
通过对苯二胺还原和CO_2超临界干燥制备N杂化石墨烯气凝胶。采用X线光电子能谱仪(XPS)、场发射扫描电子显微镜(FESEM)、N_2吸附仪和热常数分析仪表征样品在1 000℃裂解前后的微观结构、组成和热导率变化。结果表明:裂解后N杂化石墨烯气凝胶孔径增大,石墨烯上的杂化原子部分去除,常压和低压(5 Pa)热导率分别由0.031和0.014 W/(m·K)增大到0.057和0.019 W/(m·K)。裂解后气态热导是N杂化石墨烯气凝胶传热的主要方式。
N-doped graphene aerogel with paraphenylene diamine as reducing agent was prepared by CO_2 supercritical drying. The differences among microstructure,composition and thermal conductivity of Ndoped graphene aerogel with and without pyrolysis at 1 000 ℃ were investigated by X-ray photoelectron spectroscopy( XPS),filed emission scanning electron microscopy( FESEM),N_2 adsorption analyzer,and hotdisk apparatus. Results showed that with pyrolysis the pore size became larger. With N atoms getting into the graphene,some doped atoms were removed from graphene. During pyrolysis,the thermal conductivity at atmospheric pressure and that at 5 Pa increased from 0. 031 and 0. 014 W /( m · K) to0. 057 and 0. 019 W /( m · K),respectively. The gaseous thermal conductivity of N-doped graphene aerogel with pyrolysis accounted for the greater part of the total thermal conductivity.
出处
《南京工业大学学报(自然科学版)》
CAS
北大核心
2016年第2期1-6,共6页
Journal of Nanjing Tech University(Natural Science Edition)
基金
国家自然科学基金(51172279
51302317)
湖南省高校科技创新团队支持计划
国防科学技术大学陶瓷纤维与复合材料技术创新群体
关键词
裂解
杂化
石墨烯
气凝胶
热导率
pyrolysis
doped
graphene
aerogel
thermal conductivity