Tuning of photoluminescence intensity and Fermi level position of individual single-walled carbon nanotubes by molecule confinement
Tuning of photoluminescence intensity and Fermi level position of individual single-walled carbon nanotubes by molecule confinement
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DOI：
10.1016/j.carbon.2021.09.072
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发表时间：
2021-10-22
期刊：
影响因子：
10.9
通讯作者：
Alvarez, Laurent
中科院分区：
文献类型：
--
作者：
Chambard, Romain;Moreno-Lopez, Juan Carlos;Alvarez, Laurent
单壁碳纳米管的光致发光是通过将分子封装到其中空芯中来在单个尺度上监测的。根据电子性质（电子供体或受体）的限制分子，增强或淬灭的光致发光强度的证明。这种行为被分配到一个电荷转移，证明了由拉曼G-带的位移，和相关的费米能级位移所示的光电发射实验。我们的实验结果得到了DFT计算的支持。一个一致的图片发生在混合系统中的物理相互作用及其对光学和电子性能的影响。我们的研究结果表明，电子亲和势或电离势的封装分子和纳米管的直径是相关的参数，以调整在纳米尺度的混合系统的发光性能。(C)2021爱思唯尔有限公司保留所有权利。
Photoluminescence of single-walled carbon nanotubes is monitored at the individual scale by molecule encapsulation into their hollow core. Depending on the electronic character (electron donor or acceptor) of the confined molecule, enhancement or quenching of the photoluminescence intensity is demonstrated. This behavior is assigned to a charge transfer, evidenced by the shift of the Raman G-band, and a correlated Fermi level shift shown by photoemission experiments. Our experimental results are supported by DFT calculations. A consistent picture of the physical interactions taking place in the hybrid systems and their effects on the optical and electronic properties is given. Our results indicate that the electron affinity or ionization potential of the encapsulated molecules and the diameter of the nanotube are relevant parameters to tune the light emission properties of the hybrid systems at the nanoscale. (C) 2021 Elsevier Ltd. All rights reserved.