Doping of single-walled carbon nanotube bundles by Bronsted acids
Doping of single-walled carbon nanotube bundles by Bronsted acids
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DOI：
10.1039/b311016h
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发表时间：
2003-12-15
影响因子：
3.3
通讯作者：
Ley, L
中科院分区：
文献类型：
--
作者：
Graupner, R;Abraham, J;Ley, L
利用X射线光电子能谱（XPS）研究了硫酸、硝酸和盐酸等布朗斯台德酸对单壁碳纳米管（SWCNTs）电子性质的影响。掺杂的影响进行了监测的碳纳米管的核心水平的结合能的变化。对于所有三种酸，通过Cls核心能级向较低结合能的偏移观察到SWCNT的受体型掺杂。推测费米能级位置的变化在H2SO4的情况下为0.5 eV，在HNO3的情况下为0.2 eV，在HCl的情况下为0.1 eV。对于HNO3和HCl的掺杂被发现是不稳定的。相应的酸的S 2p，N LS，和Cl 2p核心水平的光谱显示光谱特征，这可以归因于这些阴离子在酸中的各自的氧化态，表明掺杂是由嵌入诱导。
Using X-ray induced photoelectron spectroscopy, the influence of Bronsted acids, namely sulfuric, nitric, and hydrochloric acid on the electronic properties of single-walled carbon nanotubes (SWCNTs) was investigated. Doping effects were monitored by changes in binding energy of the C ls core level of the nanotubes. For all three acids, an acceptor type doping of the SWCNTs was observed by a shift of the C ls core level towards lower binding energies. The inferred change of the Fermi-level position was 0.5 eV in the case of H2SO4, 0.2 eV in the case of HNO3, and 0.1 eV in the case of HCl. For HNO3 and HCl the doping was found to be unstable. The S 2p, N ls, and Cl 2p core level spectra of the corresponding acid showed spectral features which can be attributed to the respective oxidation state of these anions in the acid, indicating that doping was induced by intercalation.