离域电子
芴
原子轨道
电导
化学物理
分子
量子隧道
材料科学
化学
激进的
分子物理学
原子物理学
纳米技术
电子
物理
凝聚态物理
光电子学
量子力学
有机化学
复合材料
聚合物
作者
Xingzhou Yang,Songjun Hou,Meiling Su,Qian Zhan,Hanjun Zhang,Sergio Moles Quintero,Xiaodong Liu,Junyang Liu,Wenjing Hong,Juan Casado,Qingqing Wu,Colin J. Lambert,Yonghao Zheng
标识
DOI:10.1021/acs.jpclett.3c00536
摘要
Stable organic radicals, which possess half-filled orbitals in the vicinity of the Fermi energy, are promising candidates for electronic devices. In this Letter, using a combination of scanning-tunneling-microscopy-based break junction (STM-BJ) experiments and quantum transport theory, a stable fluorene-based radical is investigated. We demonstrate that the transport properties of a series of fluorene derivatives can be tuned by controlling the degree of localization of certain orbitals. More specifically, radical 36-FR has a delocalized half-filled orbital resulting in Breit-Wigner resonances, leading to an unprecedented conductance enhancement of 2 orders of magnitude larger than the neutral nonradical counterpart (36-FOH). In other words, conversion from a closed-shell fluorene derivative to the free radical in 36-FR opens an electron transport path which massively enhances the conductance. This new understanding of the role of radicals in single-molecule junctions opens up a novel design strategy for single-molecule-based spintronic devices.
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