Measurement accuracy of the diameter of a carbon nanotube from TEM images
文献类型：期刊论文
| 作者 | Qin, C ; Peng, LM |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2002 |
| 卷号 | 65期号:15 |
| 关键词 | ELECTRON-MICROSCOPY MATERIALS SCIENCE RAMAN-SCATTERING MICROTUBULES CHIRALITY TUBES |
| ISSN号 | 1098-0121 |
| 通讯作者 | Peng, LM: Peking Univ, Dept Elect, Beijing 100871, Peoples R China. |
| 中文摘要 | The image contrast of a single-walled carbon nanotube (SWCNT) is investigated via high resolution transmission electron microscopy (HRTEM) experiments and image simulations. It is found that the common practice of determining the tube diameter by measuring the two dark lines in the HRTEM image of a SWCNT is not very accurate, and this is especially so for tubes with diameters smaller than 1 nm. Depending on the imaging conditions, both amplitude contrast and phase contrast may be generated by a carbon nanotube in a HRTEM image. In images taken at the Scherzer defocus, a SWCNT usually appear as two dark lines corresponding to the two walls of the nanotube but in general the distance between the two dark lines is smaller than the real diameter of the SWCNT. The discrepancy between these two values varies with the size of the tube and the alignment of the tube relative to the electron beam, and can be as large as 30% for sub-nanometer carbon nanotubes. For tubes larger than 1.0 nm, the discrepancy is typically less than 10%. The phase contrast of a SWCNT changes with defocus condition. The reverse contrast appears at a small underfocus, while the two dark lines associated with the two walls of the SWCNT become broader for a large underfocus. For accurate nanotube diameter determination, we recommend that measurements based on HRTEM images should be combined with image simulations and structural relaxation of the atomic models of the carbon nanotubes. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-18 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/41801]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Qin, C,Peng, LM. Measurement accuracy of the diameter of a carbon nanotube from TEM images[J]. PHYSICAL REVIEW B,2002,65(15). |
| APA | Qin, C,&Peng, LM.(2002).Measurement accuracy of the diameter of a carbon nanotube from TEM images.PHYSICAL REVIEW B,65(15). |
| MLA | Qin, C,et al."Measurement accuracy of the diameter of a carbon nanotube from TEM images".PHYSICAL REVIEW B 65.15(2002). |
入库方式： OAI收割
来源：物理研究所
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