گروه فیزیک، دانشکده علوم پایه، دانشگاه شاهد، تهران
عنوان مقاله [English]
In this paper, a new physical model is presented to describe the relation between carbon nanotube and catalytic nanoparticle diameter and environmental temperature. This relation is obtained by considering the rate of fenced surface of catalytic nanoparticle in nanotube, which leads to an appropriate formula. Obtained results of the formula show that the diameter of carbon nanotube is increased by increasing of temperature. This happens because catalyst particle has been grown, and carbon atoms which bond to catalyst during growth, will be bonded to the external catalyst atoms. So the nanotube diameter is increased. Furthermore, investigation of dependence of nanotubes diameter on catalyst type during growth shows that if thermal expansion coefficient of catalytic nanoparticle is decreased, the diameter of nanotube at each variation of temperature will be decreased.