Structural transitions of SWNT filled with C_（60） under high pressure

Raman spectra of C_（60） filled single-walled carbon nanotubes（C_（60）@SWNTs） with diameters of 1.3–1.5 nm have been studied under high pressure. A plateau in the pressure dependence of the G-band frequency at around 10 GPa was observed in both experiments with 514 nm and 830 nm excitation lasers, whi...

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Published inChinese physics B Vol. 25; no. 5; pp. 238 - 241
Main Author 邹永刚 徐莉 田锟 张贺 马晓辉 姚明光
Format Journal Article
LanguageEnglish
Published 01.05.2016
Subjects
SWNTs
单壁碳纳米管
压力演化
填充
拉曼光谱
直径
结构转变
高压力
Online AccessGet full text
ISSN1674-1056
2058-3834
DOI10.1088/1674-1056/25/5/056101

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Summary:Raman spectra of C_（60） filled single-walled carbon nanotubes（C_（60）@SWNTs） with diameters of 1.3–1.5 nm have been studied under high pressure. A plateau in the pressure dependence of the G-band frequency at around 10 GPa was observed in both experiments with 514 nm and 830 nm excitation lasers, which is similar to the high pressure behaviors of pristine SWNTs. This structural transition has been assigned to the transformation into a peanut-like structure of the nanotubes. At pressure below 2 GPa, no obvious Raman signature related to the structural transition of nanotubes was observed, unlike what has been reported for C_（70） filled nanotubes. We discussed this point in terms of the arrangement differences of C_（60） and C_（70）molecules inside the nanotubes. At higher pressure up to 15 GPa, a graphite-like pressure evolution was observed in our C_（60）@SWNTs.
Bibliography:carbon nanotubes; high pressure; Raman spectra
Yong-gang Zou, Li Xu, Kun Tian, He Zhang, Xiao-hui Ma, and Ming-guang Yao（1 National Key Laboratory of High Power Semiconductor Lasers, Changchun University of Science and Technology, Changchun 130022, China 2 State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China）
Raman spectra of C_（60） filled single-walled carbon nanotubes（C_（60）@SWNTs） with diameters of 1.3–1.5 nm have been studied under high pressure. A plateau in the pressure dependence of the G-band frequency at around 10 GPa was observed in both experiments with 514 nm and 830 nm excitation lasers, which is similar to the high pressure behaviors of pristine SWNTs. This structural transition has been assigned to the transformation into a peanut-like structure of the nanotubes. At pressure below 2 GPa, no obvious Raman signature related to the structural transition of nanotubes was observed, unlike what has been reported for C_（70） filled nanotubes. We discussed this point in terms of the arrangement differences of C_（60） and C_（70）molecules inside the nanotubes. At higher pressure up to 15 GPa, a graphite-like pressure evolution was observed in our C_（60）@SWNTs.
11-5639/O4
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/25/5/056101