The effects of H+,N+,and Ar+ ion irradiation on structural changes in multi-walled carbon nanotubes (MWCNTs) and amorphous carbon nanowires (a-CNWs) were investigated at room and elevated temperatures with different irradiation doses.It is found that at room temperature,defects were introduced in MWCNTs under 70 keV N+ ion beam irradiation at a low dose of 1 ×1016 ions/cm2 while MWCNTs transformed into a-CNWs at a high dose of 7×1016 ions/cm2.At 1 000 K,the 70 keV N+ ion beam irradiation of defective MWCNTs causes the curling of carbon clusters to an onion-like structure at a dose of 4×1016 ions/cm2 and the formation of a low density onion-like structure at 7×1016 ions/cm2.Irradiation of the defective MWCNTs by 70 keV Ar+ ion at 1 000 K and 7×1016 ions/cm2 leads to the formation of a high density onion-like structure.Irradiation of a-CNWs with 70 keV H+ ion at 1 000 K gradually increases the fraction of material with a diamond structure with increasing dose from 1 × 1016 to 1 ×1017 ions/cm2.%在室温和高温下,以不同辐射剂量的H+、N+和Ar+离子辐照多壁碳纳米管和无定形碳纳米线.利用透射电镜和拉曼光谱研究多壁碳纳米管和无定形碳纳米线的结构变化及损伤.以70keV N+离子束辐射多壁碳纳米管在室温下可形成无定形碳纳米线.1000K下70 keV的H+离子束照射导致无定形碳纳米线向金刚石结构转变.离子辐照多壁碳纳米管的有序程度足够高,70keV的N+和Ar+离子能够引起碳从多壁碳纳米管的剥落.离子辐射能够为缺陷的转化提供必需的动力学驱动力.
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