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首页> 外文期刊>Nanotechnology >Conversion of single-crystalline C_(60) nanodisks and nanorods into graphitic nanostructures via hydrogen thermal annealing
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Conversion of single-crystalline C_(60) nanodisks and nanorods into graphitic nanostructures via hydrogen thermal annealing

机译：通过氢热退火将单晶C_（60）纳米盘和纳米棒转变为石墨纳米结构

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摘要

We have developed a process to convert C_(60) nanostructures into graphitic nanostructures. Disk-shaped and wire-shaped C_(60) nanostructures synthesized by the liquid-liquid interfacial precipitation method, the vapor-solid process, and solvent evaporation were successfully converted into graphitic structures by thermal annealing in hydrogen at 900 °C. Scanning electron and tunneling electron microscopic studies confirmed that the converted nanostructures were composed of multi-graphitic structures such as multi-walled carbon nanotubes, carbon nanofibers, and carbon onions. Fourier transform Raman spectroscopy and conductance measurements were carried out to further confirm the successful formation of graphitic layers. In the Raman spectra, the nanostructures converted from C_(60) disks showed signature D, G, and G bands of graphitic structures, while the A_g mode (1469 cm~(-1)) of the original C_(60) molecule disappeared. C_(60) nanowire devices fabricated for the conductance measurements of the converted structures showed dramatically decreased resistance (R __ 100 kΩ) compared to the pristine C_(60) wire (R > 100 MΩ). Further manipulation of the reaction environment, including the gas and the annealing temperature, may reveal a new way to attain diverse graphitic nanostructures economically.
机译：我们已经开发了一种将C_（60）纳米结构转换为石墨纳米结构的方法。通过液-液界面沉淀法，气固过程和溶剂蒸发合成的圆盘状和线状C_（60）纳米结构通过在900°C的氢气中进行热退火成功地转化为石墨结构。扫描电子和隧道电子显微镜研究证实，转化的纳米结构由多石墨结构组成，例如多壁碳纳米管，碳纳米纤维和碳洋葱。进行了傅里叶变换拉曼光谱和电导测量，以进一步证实石墨层的成功形成。在拉曼光谱中，从C_（60）盘转换而来的纳米结构显示出具有标志性的石墨结构的D，G和G带，而原始C_（60）分子的A_g模式（1469 cm〜（-1））消失了。与原始的C_（60）导线（R> 100MΩ）相比，为转换结构的电导率测量而制造的C_（60）纳米线器件显示出大大降低的电阻（R __ 100kΩ）。进一步控制反应环境，包括气体和退火温度，可能揭示出一种经济地获得多种石墨纳米结构的新方法。

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