Oxidation, defunctionalization and catalyst life cycle of carbon nanotubes: a Raman spectroscopy view

被引：108
作者：
Chernyak, Sergei A. [1 ,2 ]
Ivanov, Anton S. [1 ]
Maslakov, Konstantin I. [1 ]
Egorov, Alexander V. [1 ]
Shen, Zexiang [3 ]
Savilov, Serguei S. [1 ,2 ]
Lunin, Valery V. [1 ,2 ]
机构：
[1] Lomonosov Moscow State Univ, Dept Chem, 1-3 Leninskiye Gory, Moscow 119991, Russia
[2] Russian Acad Sci, Kurnakov Inst Gen & Inorgan Chem, Dept Phys Chem, 31 Leninsky Prospect, Moscow 119991, Russia
[3] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore
来源：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2017年 / 19卷 / 03期
基金：
俄罗斯科学基金会;
关键词：
SCATTERING; SPECTRA; STABILITY; EVOLUTION; DIAMETER; SUPPORTS; SYSTEMS;
D O I：
10.1039/c6cp04657f
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Pristine, oxidized and defunctionalized carbon nanotubes ( CNTs) were studied by Raman spectroscopy, X-ray diffraction, transmission electron microscopy and low temperature nitrogen adsorption. The Raman spectra of the studied samples in the range of 900-1800 cm (-1) were deconvoluted into five components to reveal the CNT oxidation mechanism. It was found that the oxidation resulted in the reduction of graphite components and ordering of both the structured and defect part of CNTs. Acid treatment also led to different types of disorders in the surface layers of CNTs. Polyene-type, polyphenylene-type and turbostratic fragments were detected as a result of partial exfoliation. Investigation of defunctionalized CNTs showed the ordering of edge carbon atoms as well as the invariability of the total amount of defects. The study of CNTs as supports for Co-based catalysts revealed a simultaneous decrease in the number of defect fragments and increase in the number of edge carbon atoms during catalyst preparation and reduction.
引用
收藏
页码：2276 / 2285
页数：10
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