Toward mesoporous 1D structures: Expanding interlayer spaces in cup-stacked Carbon nanotubes

被引:0
|
作者
Choi, In-Soo [1 ]
Fujisawa, Kazunori [2 ]
Kaji, Koki [1 ]
Nishimura, Kohei [1 ]
Asaki, Kodai [1 ]
Kang, Cheon-Soo [2 ,3 ]
Muramatsu, Hiroyuki [1 ,2 ]
Hayashi, Takuya [1 ,2 ]
机构
[1] Shinshu Univ, Fac Engn, 4 17 1 Wakasato, Nagano 3808553, Japan
[2] Shinshu Univ, Res Initiat Supramat, 4 17 1 Wakasato, Nagano 3808553, Japan
[3] Nagano Coll, Natl Inst Technol KOSEN, Dept Engn, 716 Tokuma, Nagano 3818550, Japan
来源
CARBON TRENDS | 2024年 / 17卷
基金
日本学术振兴会;
关键词
Mesoporous materials; Cup-stacked carbon nanotubes; Graphene Oxide; Carbon Nanofiber; GRAPHENE OXIDE; MODE; SIZE;
D O I
10.1016/j.cartre.2024.100432
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Tailoring the pore structure in materials is a key to achieving efficient ion/molecular transportation. The interlayer space in graphitic materials can be expanded via the oxidation-exfoliation process. However, since the intercalation-mediated oxidation method does not work for carbon nanotubes (CNTs) that have semi-closed graphitic structures, mesoporous 1D nanostructure has been rarely prepared. In the present study, modified Hummers method-based oxidation was applied to cup-stacked carbon nanotubes (CSCNTs) with open-edge graphitic structure. The degree of oxidation was controlled by the weight ratio of the oxidant and added CNTs. The complete basal-plane oxidation was achieved when the oxidant was 5 times the weight of CSCNTs. Following thermal reduction further expanded the interlayer spaces of the CSCNTs resulting in the formation of mesoporous 1D nanostructure with alternating stacked-expanded graphene layers resembling honeycomb shape, indicating the importance of the unique nanostructure of CSCNTs for pore formation. Heat-treatment of the obtained mesoporous 1D structure helped improve the crystallinity, but at the same time deteriorated the porosity features as the heat-treatment temperature increased. Thermally induced defect repairing flattened the graphitic structure which also induced layer restacking; thus, this revealed the trade-off relationship between the crystallinity and porosity.
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页数:11
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