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作为一种典型的准一维纳米材料,纳米线具有纳米材料所特有的小尺寸效应或纳米曲率效应,经表面修饰的纳米线一般具有不同于普通纳米线的特殊性质.利用实验室发展成熟的透射电子显微镜原位辐照技术,以透射电子显微镜中残留的有机气体分子为前驱体,成功地在纳米线表面可控沉积了非晶碳纳米颗粒和碳纳米棒,以及局域凸起的非晶碳膜并形成局域肿大的同轴结构.实验结果表明,该方法能够方便地通过控制聚焦电子束的束斑尺寸、辐照方式、辐照时间以及辐照位置等参数,在纳米线表面精确可控地沉积各种非晶碳纳米结构,从而实现纳米线的表面可控修饰.对聚焦电子束辐照下基于纳米线的各种碳纳米结构的可能沉积机理作了进一步地探索,并针对透射电子显微镜中如何减少因电子束辐照诱导非晶碳沉积造成的样品污染提出了几点建议.
As a typical quasi-one-dimensional nanomaterials, nanowires have the characteristics of small size or nanocavity unique to nanomaterials. Surface-modified nanowires generally have special properties that are different from those of ordinary nanowires. Transmission electron microscopy in-situ irradiation technology, the residual organic gas molecules in the transmission electron microscope as a precursor, the successful controllable deposition of amorphous carbon nano-particles and carbon nanorods on the surface of the nanowires, as well as local raised non- Crystal carbon film and the formation of local enlargement coaxial structure.The experimental results show that the method can easily control the beam spot size of the focused electron beam, irradiation mode, irradiation time and irradiation position and other parameters in the nanowire All kinds of amorphous carbon nanostructures were deposited accurately and controllably, so as to realize the controlled surface modification of the nanowires.Further exploration was made on the possible deposition mechanism of various carbon nanostructures based on nanowires under focused electron beam irradiation, Some suggestions on how to reduce the sample contamination caused by the amorphous carbon deposition induced by electron beam irradiation were put forward in the transmission electron microscope.