The formation of nitrogen-containing functional groups on carbon nanotube surfaces: a quantitative XPS and TPD study
The formation of nitrogen-containing functional groups on carbon nanotube surfaces: a quantitative XPS and TPD study
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DOI：
10.1039/b923651a
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发表时间：
2010-01-01
影响因子：
3.3
通讯作者：
Muhler, Martin
中科院分区：
文献类型：
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作者：
Kundu, Shankhamala;Xia, Wei;Muhler, Martin
经氨后处理的部分氧化多壁碳纳米管（CNTs）表面生成含氮官能团。利用高分辨率x射线光电子能谱（XPS）和程序升温解吸（TPD）研究了处理温度对含氮和含氧官能团的数量和类型的影响。利用拉曼光谱研究了碳纳米管表面因氮掺杂而产生的缺陷。解卷积XP N1s谱用于定量。在惰性气氛和氨气氛下进行了TPD研究，定量地研究了氧化碳纳米管表面发生的表面反应。在300℃以下氨气存在下，形成了腈型、内酰胺型、亚胺型和胺型官能团。在300℃~ 500℃的介质温度范围内，ocnt主要生成了吡啶型氮基团，而吡啶型、在500℃以上处理时，碳纳米管表面以吡咯和季铵盐型氮基团为主，在500℃以下，约38%的氧官能团与氨发生反应。
Nitrogen-containing functional groups were generated on the surface of partially oxidized multi-walled carbon nanotubes (CNTs) via post-treatment in ammonia. The treatment temperature was varied in order to tune the amount and type of nitrogen- and oxygen-containing functional groups, which were studied using high-resolution X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption (TPD). The surface defects on CNTs due to the incorporation of nitrogen were investigated by Raman spectroscopy. Deconvoluted XP N1s spectra were used for the quanti. cation of different nitrogen-containing functional groups, and TPD studies were performed in inert and ammonia atmosphere to investigate the surface reactions occurring on the oxidized CNT surfaces quantitatively. Nitrile, lactam, imide and amine-type functional groups were formed in the presence of ammonia below 300 degrees C. When the OCNTs were treated in the medium temperature range between 300 degrees C to 500 degrees C, mainly pyridine-type nitrogen groups were generated, whereas pyridinic, pyrrolic and quaternary-type nitrogen groups were the dominating species present on the CNT surface when treated above 500 degrees C. It was found that about 38% of the oxygen functional groups react with ammonia below 500 degrees C.