用原子力显微镜操纵碳纳米管的研究

使用原子力显微镜,在接触模式下实现了对单壁碳纳米管束的各种可控操纵,包括弯折、切割和劈裂等.发现操纵结果与针尖作用力以及碳纳米管束在基底表面的受力状况有关.当碳纳米管在一定程度上被固定在表面上时,能够可控地完成各种操纵；当针尖作用力足够大时,碳管束能够被针尖劈裂.这种操纵技术将有助于碳纳米管特性的测试和纳米电子器件的构筑.     

多层碳纳米球的研究

用弧光放电法制备了碳的巴基葱.用原子力显微镜（AFM）、扫描隧道显微镜（STM）和透射电镜（TEM）研究了在高定向石墨(HOPG)和金(Au)基底上的巴基葱的行为和电学特性.扫描隧道谱表明,巴基葱的电学特性具有与单壁碳纳米管相似的非线性特性.较小尺寸的巴基葱呈半导体特性,尺寸增大倾向金属线性.AFM/STM图像显示,在HOPG和Au基底上的巴基葱能够聚集成二聚体.利用较小尺寸巴基葱的电学非线性特性,有希望构造纳米电子学的单电子器件.     

巴基葱的微观形态与电学特性研究

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INVESTIGATION ON THE STRUCTURE AND ELECTRIC PROPERTIES OF BUCKY ONIONS

Bucky onions were fabricated by the DC discharge method and their behaviors and electric properties on Highly Oriented Pyrolytic Graphite (HOPG) were studied by using an atomic force microscope (AFM), a scanning tunneling microscope (STM) and a transmission electron microscope (TEM). Small-sized Bucky onions demonstrated the properties of semiconductors and as the size increased their metallicity became stronger. AFM and STM images revealed the tendency of Bucky onions to form dimers.