Opening mechanism of internal nanoporosity of single-wall carbon nanohorn
Opening mechanism of internal nanoporosity of single-wall carbon nanohorn
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DOI：
10.1021/jp0512661
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发表时间：
2005-08-04
影响因子：
3.3
通讯作者：
Kaneko, K
中科院分区：
文献类型：
--
作者：
Utsumi, S;Miyawaki, J;Kaneko, K
单壁碳纳米角（SWNH），这是一个管状颗粒与锥帽，在氧气流中在不同的温度下氧化。在77 K下的N-2吸附，热重分析（TG），差热分析（DTA），透射电子显微镜，和拉曼光谱测量进行氧化的SWNH。氧化产物的比表面积可通过氧化温度控制，最大可达1420 m2/g。通过BJH方法的孔径分布和在不同温度下氧化的SWNH的N2吸附等温线对生长的SWNH的比较图揭示了打开内部纳米孔的最低氧化温度。TG-DTA分析确定了所生长的SWNH的组分：无定形碳2.5重量%，在圆锥部分的缺陷碳15重量%，管状碳70重量%，和石墨碳12重量%。这些系统分析提供了纯SWNH颗粒的0.49 mL/g的精确内部纳米孔体积。
Single-wall carbon nanohorn (SWNH), which is a tubular particle with a cone cap, was oxidized in an oxygen flow at various temperatures. N-2 adsorption at 77 K, thermogravinietry (TG), differential thermal analysis (DTA), transmission electron microscopy, and Raman spectroscopy measurements were carried out on the oxidized SWNHs. The specific surface area of the oxidized SWNHs can be controlled by oxidation temperature, giving the maximum value of 1420 m(2)/g. The pore size distribution by the BJH method and the comparison plot of the N2 adsorption isotherms of SWNH oxidized at different temperatures against that of as-grown SWNH revealed the minimum oxidation temperature for opening internal nanopores. TG-DTA analyses determined the components of as-grown SWNH: amorphous carbon 2.5 wt %, defective carbon at the cone part 15 wt %, tubular carbon 70 wt %, and graphitic carbon 12 wt %. These systematic analyses provided the exact internal nanopore volume of 0.49 mL/g for pure SWNH particles.