Surface Area Measurement of Functionalized Single-Walled Carbon Nanotubes
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- 作者：Soma Chakraborty ; Jayanta Chattopadhyay ; Haiqing Peng ; Zheyi Chen ; Arnab Mukherjee ; Rolf S. Arvidson ; Robert H. Hauge ; W. E. Billups
- 刊名：Journal of Physical Chemistry B
- 出版年：2006
- 出版时间：December 14, 2006
- 年：2006
- 卷：110
- 期：49
- 页码：24812 - 24815
- 全文大小：201K
- 年卷期：v.110,no.49(December 14, 2006)
- ISSN：1520-5207
文摘
Single-walled carbon nanotubes have been functionalized and the specific surface areas of the functionalizednanotubes measured. Contrary to expectations, functionalization leads to a decrease in specific surface areacompared to that of the unfunctionalized nanotubes. Treatment with a concentrated 1:1 nitric/sulfuric acidmixture followed by high-temperature baking at 1000 
C was found to increase the specific surface area ofthe nanotubes. For the unfunctionalized SWNTs, this treatment increases the specific surface area (SSA) by20%. In the case of SWNTs functionalized by n-butyl groups the increase in the SSA was nearly 2-fold withthe value increasing from 410 (drying at 110 C) to 770 m2/gm (acid and bake treatment followed by dryingat 110 C). For the ozonized SWNTs, the SSA increases more than 3-fold from 381 (drying at 110 C) to1068 m2/gm (acid and bake treatment followed by drying at 110 C). SEM images indicate that the nanotubesrebundle in the solid state with an average bundle size of 10-30 nm. AFM studies show that the ozonizedtubes have been cut to short bundles after ozonolysis. Hydrogen uptake studies carried out on the bakedozonized tubes led to a 3 wt % hydrogen uptake at 77 K and 30 bar.
C was found to increase the specific surface area ofthe nanotubes. For the unfunctionalized SWNTs, this treatment increases the specific surface area (SSA) by20%. In the case of SWNTs functionalized by n-butyl groups the increase in the SSA was nearly 2-fold withthe value increasing from 410 (drying at 110 C) to 770 m2/gm (acid and bake treatment followed by dryingat 110 C). For the ozonized SWNTs, the SSA increases more than 3-fold from 381 (drying at 110 C) to1068 m2/gm (acid and bake treatment followed by drying at 110 C). SEM images indicate that the nanotubesrebundle in the solid state with an average bundle size of 10-30 nm. AFM studies show that the ozonizedtubes have been cut to short bundles after ozonolysis. Hydrogen uptake studies carried out on the bakedozonized tubes led to a 3 wt % hydrogen uptake at 77 K and 30 bar.