无机材料学报 ›› 2022, Vol. 37 ›› Issue (4): 413-419.DOI: 10.15541/jim20210139 CSTR: 32189.14.10.15541/jim20210139

• 研究论文 • 上一篇    下一篇

碳纳米管内填充生长超细一维亚化学计量比氧化钨纳米线

吴秋琴1,2(), 姚奋发2, 金传洪2, 郑遗凡1()   

  1. 1.浙江工业大学 化学工程学院, 杭州 310014
    2.浙江大学 材料科学与工程学院, 硅材料国家重点实验室, 杭州310027
  • 收稿日期:2021-03-10 修回日期:2021-04-01 出版日期:2022-04-20 网络出版日期:2021-04-30
  • 通讯作者: 郑遗凡, 教授. E-mail: Zhengyifan@zjut.edu.cn
  • 作者简介:吴秋琴(1996-), 女, 硕士研究生. E-mail: wuqiuqin0601@foxmail.com
  • 基金资助:
    国家自然科学基金重点项目(51772265);国家自然科学基金重点项目(61721005)

One-dimensional Sub-stoichiometric W3O8 Nanowires Filled Carbon Nanotubes

WU Qiuqin1,2(), YAO Fenfa2, JIN Chuanhong2, ZHENG Yifan1()   

  1. 1. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
    2. State Key Laboratory Materials School of Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
  • Received:2021-03-10 Revised:2021-04-01 Published:2022-04-20 Online:2021-04-30
  • Contact: ZHENG Yifan, professor. E-mail: Zhengyifan@zjut.edu.cn
  • About author:WU Qiuqin (1996-), female, Master candidate. E-mail: wuqiuqin0601@foxmail.com
  • Supported by:
    National Natural Science Foundation of China(51772265);National Natural Science Foundation of China(61721005)

摘要:

超细亚化学计量比过渡金属氧化物纳米材料的可控制备具有重要应用价值, 但其可控合成仍存在挑战。本研究提出了基于碳纳米管的限域空间合成法, 首先采用溶液法将四硫代钨酸铵((NH4)2WS4)填充至碳管内, 然后真空热分解反应制得产物。通过表征发现: 碳管内限域生长的主要产物为一维亚氧化物W3O8纳米线, 其典型线宽为1.23~1.93 nm, 对应4~5列钨氧原子链, 长度可达数十微米。W3O8纳米线与碳管内壁之间主要为范德华力相互作用(间距约0.35 nm), 为分离及表征W3O8纳米线的本征特性提供了方便, 该方法也有望应用于合成其他亚化学计量比的一维过渡金属氧化物纳米线。

关键词: 氧化钨纳米线, 碳纳米管填充, 亚化学计量比, 原子分辨率扫描透射电子显微镜

Abstract:

Nanostructured sub-stoichiometric transition metal oxides hold promising applications in many areas, while challenge still remains towards their precisely controlled synthesis, particularly for those ultrafine nanowires. In present work, a carbon nanotube (CNT) inner growth based on two-step synthetic approach was adopted to achieve one-dimensional sub-stoichiometric tungsten oxides. Ammonium tetrathiotungsten((NH4)2WS4)) were encapsulated into the inner cavity of carbon nanotubes, which were thermally decomposed into tungsten oxides inside the CNTs. Characterizations confirm that the CNT-filling products are ultrafine one-dimensional W3O8 nanowires, that appears 1.23-1.93 nm in width (corresponding to four-five arrays of tungsten atomic column) and up tens of microns in length (close to that of CNTs). The non-noticeable size-dependent lattice parameters of the W3O8 nanowires and the large nanowire-CNT separation indicate a rather weak interaction between the filled W3O8 nanowires and host CNTs, which provides the opportunity to separate and probe the intrinsic properties of these ultrafine 1D W3O8 nanowires. Nevertheless, the proposed synthetic method is extendable to achieve other 1D transition metal oxides.

Key words: one-dimensional tungsten sub-oxide nanowires, carbon nanotube filling, sub-stoichiometric, atomic-resolution STEM

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