论文部分内容阅读
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。
The mechanism of adsorption of tryptophan (Trp) on single walled carbon nanotubes (SWCNTs) was investigated by using near-edge X-ray absorption fine structure spectroscopy (NEXAFS) and synchrotron radiation electron spectroscopy (SRPES) Contrasting the NEXAFS spectra of Trp adsorbed on the C-K side of samples before and after SWCNTs, we found that there is a clear interfacial interaction between SWCNTs and adsorbed Trp. The change of peak shape and peak position of NEXAFS spectrum of N-K side before and after adsorption are negligible, which indicates that neither of the two N atoms in Trp participate in the interface interaction. The edge pre-peak of the NEXAFS spectrum in the OK edge after the adsorption is more sharp and stronger, indicating that the O atom of C = O is involved in the interfacial interaction; and the obvious change of the peak shape of the main absorption peak is possible for O atoms of C = O and CO Participate in the interfacial interaction, and the O1s SRPES spectrum confirms that only O atoms in C = O are involved in the interfacial interaction.