Fermi level shift in carbon nanotubes by dye confinement
Fermi level shift in carbon nanotubes by dye confinement
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DOI：
10.1016/j.carbon.2019.04.041
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发表时间：
2019-08-01
期刊：
影响因子：
10.9
通讯作者：
Alvarez, L.
中科院分区：
文献类型：
--
作者：
Almadori, Y.;Delport, G.;Alvarez, L.
碳纳米管中的染料限制显着影响最终混合系统的电子电荷密度分布。利用拉曼 G 波段的电子-声子耦合灵敏度，我们通过实验量化了纳米容器的直径及其金属或半导体特性如何调节从噻吩低聚物到单壁碳纳米管的电荷转移。这种电荷转移被证明可以恢复缺陷金属纳米管中的电子-声子耦合。对于亚纳米直径管，当激发能量与受限低聚噻吩的 HOMO-LUMO 跃迁相匹配时，可以观察到光学激活的电子转移。这种电子掺杂使光致发光强度显着增强，达到最佳限制配置的近六倍。这种电子转移会改变费米能级，从而影响光致发光效率。因此，噻吩低聚物封装可以调节电子结构，然后调节混合系统的光学特性。 (C) 2019 年由爱思唯尔有限公司出版。
Dye confinement into carbon nanotube significantly affects the electronic charge density distribution of the final hybrid system. Using the electron-phonon coupling sensitivity of the Raman G-band, we quantify experimentally how charge transfer from thiophene oligomers to single walled carbon nanotube is modulated by the diameter of the nano-container and its metallic or semiconducting character. This charge transfer is shown to restore the electron-phonon coupling into defected metallic nanotubes. For sub-nanometer diameter tube, an electron transfer optically activated is observed when the excitation energy matches the HOMO-LUMO transition of the confined oligothiophene. This electron doping accounts for an important enhancement of the photoluminescence intensity up to a factor of nearly six for optimal confinement configuration. This electron transfer shifts the Fermi level, acting on the photoluminescence efficiency. Therefore, thiophene oligomer encapsulation allows modulating the electronic structure and then the optical properties of the hybrid system. (C) 2019 Published by Elsevier Ltd.