Mechanisms of tryptophan adsorption onto single-walled carbon nanotubes

ZHOU Jieping TAN Jun XU Pengshou SHENG Liusi PAN Guoqiang

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Mechanisms of tryptophan adsorption onto single-walled carbon nanotubes

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- Mechanisms of tryptophan adsorption onto single-walled carbon nanotubes
- NUCLEAR TECHNIQUES Vol. 34, Issue 8, (2011)
- 作者机构：
  
  中国科学技术大学国家同步辐射实验室
- 作者简介：
- 基金信息：
  
  国家自然科学基金课题(11079032)资助
- DOI：
  CLC： TB383.1
- Published：01 August 2011
- 稿件说明：
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[1]周解平,唐军,徐彭寿,盛六四,潘国强.单壁碳纳米管吸附色氨酸的机理研究[J].核技术,2011,34(08):565-568.

ZHOU Jieping TAN Jun XU Pengshou SHENG Liusi PAN Guoqiang. Mechanisms of tryptophan adsorption onto single-walled carbon nanotubes[J]. Nuclear techniques, 2011, 34(8): 565-568.
[1]周解平,唐军,徐彭寿,盛六四,潘国强.单壁碳纳米管吸附色氨酸的机理研究[J].核技术,2011,34(08):565-568. DOI：

ZHOU Jieping TAN Jun XU Pengshou SHENG Liusi PAN Guoqiang. Mechanisms of tryptophan adsorption onto single-walled carbon nanotubes[J]. Nuclear techniques, 2011, 34(8): 565-568. DOI：

摘要

用近边X射线吸收精细结构谱（NEXAFS）和同步辐射电子能谱（SRPES）技术

研究了单壁碳纳米管（SWCNTs）吸附色氨酸（Trp）的机理。对比Trp吸附于SWCNTs前后样品C-K边NEXAFS谱

发现SWCNTs与吸附的Trp之间存在明显的界面相互作用。吸附前后N-K边NEXAFS谱的峰形和峰位的变化可忽略

这表明Trp中的两个N原子都未参与界面相互作用。吸附后O-K边NEXAFS谱的边前峰更尖更强

这表明C=O的O原子参与了界面相互作用;吸收主峰的峰形的明显变化

则C=O和C-O的O原子都有可能参与界面相互作用

而O1s SRPES谱证实仅有C=O中的O原子参与了界面相互作用。

Abstract

Near edge X-ray absorption fine structure spectroscopy(NEXAFS) and synchrotron radiation photoelectron spectroscopy(SRPES) were employed to investigate the adsorption mechanism of tryptophan(Trp) onto single-walled carbon nanotubes(SWCNTs).The difference of the carbon K-edge NEXAFS spectra between Trp molecules and Trp-adsorbed SWCNTs shows that a significant interaction occurs among the SWCNTs and Trp molecules adsorbed.However

negligible changes in the peak profiles and energy positions of nitrogen K-edge imply that neither of the two nitrogen atoms in Trp molecule is involved in the interface interaction.A change of the shape of the main absorption peak at the oxygen K-edge reveals that O atoms of the C=O or C-O or both are likely involved in the interface interaction.The fact that the peak at about 529 eV at the O K-edge become sharper and stronger demonstrates that the O atom in the C=O participates in the interface interaction

which was confirmed by O1s SRPES spectrum.

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