摘要
采用气相扩散方法将C60分子填充到单壁碳纳米管(SWNTs)中,制备出高填充比率的豆荚形纳米材料C60@SWNT,又称为peapod.用金刚石对顶砧(DAC)装置获得高压,在高压下同时利用紫外激光处理样品,通过激光和压力的共同作用研究了C60分子在碳管内的聚合相变.在21.5GPa高压下,同时紫外激光(325nm)照射30min后,拉曼光谱表明C60分子在碳管内发生了聚合,形成一维链状O相聚合结构,且该相变是不可逆的.紫外激光的引入使样品发生O相聚合所需的压力值低于仅由压力诱导的聚合压力.
The C60 SWNT (peapod) samples were prepared by the vapor diffusion method. Polymerization of C60 molecules in single walled carbon nanotubes (SWNTs) under high pressure and simultaneous irradiation of UV laser (325 nm) has been carried out for the first time by using diamond anvil cell. Raman spectra of the peapod samples decompressed from high pressure indicated that C60 molecules form one-dimensional orthorhombic polymer in SWNTs under UV laser irradiation at a high pressure of 21.5GPa, which is lower than that for the polymerization of samples induced by high pressure only. The polymerization is an irreversible phase transition in the peapod.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第9期5172-5175,共4页
Acta Physica Sinica
基金
国家自然科学基金(批准号:10674053
10204010
10574053)
跨世纪优秀人才培养计划(批准号:20020183050)
教育部科技创新工程重大培育项目(批准号:2004-295)
国家重点基础研究发展计划(批准号:2005CB724400
2001CB711201)
吉林省科技发展计划项目
Swedish research council资助的课题.~~