Simultaneous enhancement in porosity and magnetic property of Fe-dispersing single-walled carbon nanohorns by oxidation using CO2
Simultaneous enhancement in porosity and magnetic property of Fe-dispersing single-walled carbon nanohorns by oxidation using CO2
复制标题
通过 CO2 氧化同时增强 Fe 分散单壁碳纳米角的孔隙率和磁性
DOI：
10.1016/j.cej.2015.02.074
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发表时间：
2015
影响因子：
15.1
通讯作者：
Hajime Tamon
中科院分区：
文献类型：
--
作者：
Noriaki Sano;Daisuke Himara;Hajime Tamon
结果表明，在1000℃下，用n2稀释的CO2（10%）氧化，fe -分散单壁碳纳米角（Fe-CNHs）的比表面积和磁化率显著提高，但CNH结构没有明显破坏。埋弧放电法合成的生长期铁碳水化合物比表面积为184 m2/g，氧化处理后通过开孔使比表面积提高到500 m2/g。在此条件下，碳基比表面积由211 m2/g提高到863 m2/g。分散在Fe- cnh中的Fe纳米颗粒转化为铁磁性的fe3o4纳米颗粒，其颗粒大小和cnh结构没有明显变化。Fe-CNHs的磁化率因氧化而提高，表明其磁性迁移率可以得到改善。Fe-CNHs在CO2-N2中氧化时间延长后结构稳定。与CO2-N2中的氧化相反，空气中的氧化导致Fe纳米颗粒转变为顺磁性的Fe2O3，过度氧化导致CNHs的破坏性损失。
It was discovered that the specific surface area and magnetic susceptibility of Fe-dispersing single-walled carbon nanohorns (Fe-CNHs) were significantly increased without obvious destruction of CNH structures by oxidation in CO2(10%) diluted with N2at 1000 °C. As-grown Fe-CNHs synthesized by a submerged arc discharge method had a specific surface area of 184 m2/g, and this surface area was raised to 500 m2/g by opening of pores upon this oxidation treatment. Under this condition, the carbon-based specific surface area are enhanced from 211 m2/g to 863 m2/g. Fe nanoparticles dispersing in Fe-CNHs were transformed into ferrimagnetic Fe3O4nanoparticles without obvious change in their particle sizes and frames of CNHs. The magnetic susceptibility of the Fe-CNHs was increased by this oxidation, suggesting that their magnetic mobility could be improved. The structure of Fe-CNHs was stable against the extended oxidation duration in the CO2–N2. In contrast to the oxidation in CO2–N2, the oxidation in air resulted in the transformation of Fe nanoparticles into paramagnetic Fe2O3, and the excessive oxidation led to destructive loss of CNHs.