单壁碳纳米角内部纳米孔隙的开启机制

Opening mechanism of internal nanoporosity of single-wall carbon nanohorn.

作者信息

Utsumi Shigenori, Miyawaki Jin, Tanaka Hideki, Hattori Yoshiyuki, Itoi Takaomi, Ichikuni Nobuyuki, Kanoh Hirofumi, Yudasaka Masako, Iijima Sumio, Kaneko Katsumi

机构信息

Center for Frontier Electronics and Photonics, Chiba University, 1-33 Yayoi, Inage, Chiba 263-8522, Japan.

出版信息

J Phys Chem B. 2005 Aug 4;109(30):14319-24. doi: 10.1021/jp0512661.

DOI:10.1021/jp0512661

PMID:16852800

Abstract

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, thermogravimetry (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 N(2) 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.

摘要

单壁碳纳米角（SWNH）是一种带有锥形帽的管状颗粒，在不同温度的氧气流中被氧化。对氧化后的SWNH进行了77K下的N₂吸附、热重分析（TG）、差示热分析（DTA）、透射电子显微镜和拉曼光谱测量。氧化后的SWNH的比表面积可通过氧化温度来控制，最大值为1420 m²/g。通过BJH方法得到的孔径分布以及不同温度下氧化的SWNH与生长态SWNH的N₂吸附等温线的对比图揭示了打开内部纳米孔的最低氧化温度。TG-DTA分析确定了生长态SWNH的成分：无定形碳2.5 wt%、锥形部分的缺陷碳15 wt%、管状碳70 wt%和石墨碳12 wt%。这些系统分析得出纯SWNH颗粒的精确内部纳米孔体积为0.49 mL/g。