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Molecular dimer junctions forming: Role of disulfide bonds and electrode-compression-time

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2024

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Zhao, Xueyan
Yan, Yan
Tan, Min
Zhang, Surong
Xu, Xiaona
Zhao, Zhibin
Zhang, Xubin
Adijiang, Adila
Li, Zongliang

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Deutsche Forschungsgemeinschaft (DFG): 406778771
National Natural Science Foundation of China: 11804170
National Natural Science Foundation of China: 22273041
National Natural Science Foundation of China: 91950116
National Natural Science Foundation of China: 11974217

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SmartMat. Wiley. 2024, 5(4), e1280. ISSN 2766-8525. eISSN 2688-819X. Verfügbar unter: doi: 10.1002/smm2.1280

Zusammenfassung

Thanks to their excellent bond strength, phenyl-based molecules with thiol anchoring groups are extensively employed to form stable single-molecule junctions. However, two critical questions are still not answered which seriously hinder high-yield establishing reliable molecular functional devices: (1) Whether molecular dimer junctions will be formed, and if this is the case, whether the dimerization is caused by intermolecular disulfide bonds or π–π stacking of phenyl rings; (2) Upon a mechanical-compression force, is it possible that both anchoring groups of the molecule bond to the same electrode instead of bridging two opposite electrodes, which would drastically reduce the yield of the molecular junctions. Here, combining UV-Vis/Raman spectroscopy of bulk molecules and conductance/flicker-noise measurements of single molecules, we give compelling evidence that molecular dimers naturally form under ambient conditions, primarily via disulfide bonds rather than by π–π stacking. We further proposed a technique, named electrode-compression-hold-on (ECHO), and reveal that the two thiol groups of phenyl-backboned molecules will bond to the same electrode upon a compression force with a prolongated ECHO time. In contrast, the compression-time-dependent phenomenon is not observed for alkyl-backboned molecules. The underlying mechanism for these unprecedented observations is elucidated, shedding light on the yield of molecular junctions.

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530 Physik

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ISO 690ZHAO, Xueyan, Yan YAN, Min TAN, Surong ZHANG, Xiaona XU, Zhibin ZHAO, Maoning WANG, Xubin ZHANG, Adila ADIJIANG, Zongliang LI, Elke SCHEER, Dong XIANG, 2024. Molecular dimer junctions forming: Role of disulfide bonds and electrode-compression-time. In: SmartMat. Wiley. 2024, 5(4), e1280. ISSN 2766-8525. eISSN 2688-819X. Verfügbar unter: doi: 10.1002/smm2.1280
BibTex
@article{Zhao2024-08Molec-69613,
  year={2024},
  doi={10.1002/smm2.1280},
  title={Molecular dimer junctions forming: Role of disulfide bonds and electrode-compression-time},
  number={4},
  volume={5},
  issn={2766-8525},
  journal={SmartMat},
  author={Zhao, Xueyan and Yan, Yan and Tan, Min and Zhang, Surong and Xu, Xiaona and Zhao, Zhibin and Wang, Maoning and Zhang, Xubin and Adijiang, Adila and Li, Zongliang and Scheer, Elke and Xiang, Dong},
  note={Article Number: e1280}
}
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