文献类型：期刊文献

英文题名：Single-Molecule Charge Transport through Thiazole-End-CappedConjugated Oligomers: Synergistic Au-π and Au-πInteractionsand Controllable Self-Decoupled Properties

作者：Li, Yunpeng[1];Zhou, Yu[2];Li, Yingjie[1];Hong, Wenjing[2];Li, Hongxiang[1]

机构：[1]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Frontiers Sci Ctr Materiobiol & Dynam Chem, Inst Fine Chem,Sch Chem & Mol Engn,Key Lab Adv Ma, Shanghai 200237, Peoples R China;[2]Xiamen Univ, Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China

年份：2022

卷号：126

期号：14

起止页码：6420

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY C

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000791598700035)】；

基金：This work was supported by the National Natural Science Foundation of China (grants 21875279, 21790362, and 22075080), the Shanghai Municipal Science and Technology Major Project (grant 2018SHZDZX03), the Fundamental Research Funds for the Central Universities, the Program of Introducing Talents of Discipline to Universities (grant B16017), and the Program of Shanghai Academic/Technology Research Leader (19XD1421100).

语种：英文

摘要：The chemical identity of anchoring groups has a great impact onthe charge transport in single-molecule junctions. In this paper, a new pi-conjugated anchoring group, thiazole, with a built-in quantum interference (QI)feature for Au-molecule-Au junction is reported. The charge transport propertiesof thiazole-end-capped conjugated molecules are investigated by the scanningtunneling microscopy break junction (STMBJ) technique. Experimental resultsshow that the conductance of junctions changes distinctly with the substitutionpositions of thiazole, which is ascribed to the quantum interference and the changeof coupling strength between molecule and electrodes. Notably, the conductancechange reaches 331 times, much higher than that of benchmark anchoring grouppyridine-terminated molecules. X-ray photoelectron spectroscopy (XPS) experi-ments and DFT calculations confirm that Au-N and Au-pi interactions co-serveas anchoring sources, and the coupling strength between thiazole anchor andelectrodes is tunable. These results highlight the built-in QI feature of thiazole anchor and enrich the self-decoupling strategies forconjugated molecules.