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首页> 外文期刊>Applied Surface Science >Surface Characterization Of Oxygen-functionalized Multi-walled carbon Nanotubes By High-resolution X-ray Photoelectron spectroscopy And Temperature-programmed Desorption
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Surface Characterization Of Oxygen-functionalized Multi-walled carbon Nanotubes By High-resolution X-ray Photoelectron spectroscopy And Temperature-programmed Desorption

机译：氧官能化多壁碳纳米管的高分辨率X射线光电子能谱和程序升温脱附表征

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摘要

Multi-walled carbon nanotubes were exposed either to nitric acid or to an oxygen plasma to synthesize oxygen-containing functional groups which were characterized by high-resolution X-ray photoelectron spectroscopy (XPS). The C ls spectra revealed that the treatment with nitric acid mainly resulted in the formation of carboxylic (COOR) and phenolic (C-OR) groups, whereas the plasma treatment led to a higher amount of carbonyl (C=O) groups. Furthermore, the nitric acid treatment yielded a 60% higher surface oxygen concentration compared to the plasma treatment, and created a minor amount of nitrogen-containing functional groups. Thus, the nitric acid treatment was found to be more effective in creating acidic functional groups. The presence and the thermal stability of these groups was also investigated by temperature-programmed desorption (TPD). The release of carbon dioxide was detected at about 350 and 450 ℃, indicating the decomposition of COOR groups. The C=O groups were more stable decomposing even above 600 ℃. In addition, ammonia was adsorbed as probe molecule followed by TPD to derive the amount and the acidity of the carboxylic and phenolic groups.
机译：将多壁碳纳米管暴露于硝酸或氧等离子体中以合成含氧官能团，该官能团的特征在于高分辨率X射线光电子能谱（XPS）。 C 1s光谱表明，硝酸处理主要导致羧基（COOR）和酚基（C-OR）的形成，而等离子处理导致羰基（C = O）的数量增加。此外，与等离子体处理相比，硝酸处理产生的表面氧浓度高60％，并产生了少量的含氮官能团。因此，发现硝酸处理在产生酸性官能团方面更有效。还通过程序升温脱附（TPD）研究了这些基团的存在和热稳定性。在约350和450℃检测到二氧化碳的释放，表明COOR基团的分解。即使在600℃以上，C = O基团也更稳定地分解。此外，氨被吸附为探针分子，然后是TPD，以得出羧基和酚基的数量和酸度。

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