Characterization of high-pressure sintered C_60 nanowhiskers and C_60 powder
Characterization of high-pressure sintered C_60 nanowhiskers and C_60 powder
复制标题
高压烧结C_60纳米晶须和C_60粉末的表征
DOI：
10.1557/jmr.2005.0095
复制
发表时间：
2005
影响因子：
2.7
通讯作者：
H. Kakisawa
中科院分区：
文献类型：
--
作者：
J. Minato;K. Miyazawa;T. Suga;H. Kanda;M. Akaishi;K. Yamaura;E. Muromachi;H. Kakisawa
采用液-液界面沉淀法制备了C60纳米晶须，并将其与纯C60粉末在800 °C、5.5GPa下烧结2 h。试样的显微维氏硬度约为1100 kg/mm^2，电阻率低至几Ωm。X射线衍射、高分辨透射电子显微镜、傅里叶变换红外光谱和拉曼光谱的结构表征表明，高压高温处理使大部分C_（60）分子断裂，形成乱层石墨。与相同条件下烧结的原始C_60粉末的比较表明，结构变化在微观上取决于C_60分子，但起始材料的尺寸和形貌也影响宏观烧结过程。
C_60 nanowhiskers fabricated by liquid-liquid interfacial precipitation method and pristine C_60 powder were sintered at 800 °C under 5.5 GPa for 2 h. The specimens showed high micro-Vickers hardness about 1100 kg/mm^2 and electrical resistivity as low as several Ωm. Structural characterization by x-ray diffraction, high-resolution transmission electron microscopy, Fourier transform infrared, and Raman spectroscopy revealed that most of C_60 molecules were broken to form turbostratic graphite by high-pressure and high-temperature treatment. Comparison with the pristine C_60 powder sintered under the same conditions suggests that the structural change depends microscopically on the C_60 molecules, but the size and the morphology of the starting material also affect the macroscopic sintering process.