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arXiv 2107.11297cond-mat.mtrl-scicond-mat.mes-hallphysics.app-ph
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双壁碳纳米管与导电聚合物复合材料的原位拉曼光谱电化学研究

Controlled Doping of Double Walled Carbon Nanotubes and Conducting Polymers in a Composite: An in situ Raman Spectroelectrochemical Study

Martin Kalbáč, Ladislav Kavan, Lothar Dunsch

摘要:

采用原位拉曼光谱电化学研究了双壁碳纳米管(DWCNTs)与导电聚合物聚(3,4-乙撑二氧噻吩/聚苯乙烯磺酸盐)(PEDOT/PSS)的相互作用。DWCNTs与PEDOT/PSS的混合引起DWCNTs外管的部分掺杂,这由DWCNTs特征的拉曼强度的相对变化指示。另一方面,对应于DWCNTs的内管和聚合物的带几乎未被组装成复合材料的两个物种。原位拉曼光谱电化学实验表明,嵌入PEDOT/PSS基体中的DWCNTs内管电子结构的变化与掺杂水平有关。而在低掺杂水平的复合材料,内管的DWCNTs的拉曼特征没有显着变化,在高掺杂水平,他们反映了所施加的电化学电位所引起的变化类似于在无聚合物DWCNTs中观察到的。

英文摘要:

The interaction of double wall carbon nanotubes (DWCNTs) and the conducting polymer poly(3,4-ethylenedioxythiphene/polystyrenesulfonate (PEDOT/PSS) was studied by in-situ Raman spectroelectrochemistry. The mixing of DWCNTs with PEDOT/PSS caused a partial doping of the outer tube of DWCNTs, which was indicated by the relative change of the Raman intensity of the DWCNTs features. On the other hand, the bands corresponding to inner tubes of DWCNTs and to the polymer were almost untouched by assembling both species into a composite. The in situ Raman spectroelectrochemical experiments have shown that the changes in electronic structure of inner tubes of DWCNTs embedded in PEDOT/PSS matrix are dependent on the doping level. While at the low doping level of the composite, the Raman features of inner tubes of DWCNTs do not change significantly, at high doping level they reflect the changes caused by the applied electrochemical potential similar to that observed in the polymer-free DWCNTs.

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