Issue 45, 2021

Single-molecule conductance variations of up to four orders of magnitude via contacting electrodes with different anchoring sites

Abstract

Control of conductance through a single molecule via alternating anchoring points provides a unique perspective to design single-molecule electronic devices. A high conductance difference among different states is essential for a single-molecule electronic device, which is challenging due to restriction of the structural changes in single-molecule junctions. Here, tetraphenylethylene derivatives with multiple anchoring sites are designed and synthesized to investigate single-molecule conductance using the scanning tunneling microscope break junction (STM-BJ) technique. In the break-junction cycle process, connection conformations with different anchor sites have been achieved reversibly to switch single-molecule conductance using the STM-BJ technique. Through mechanical control, these multi-anchored single-molecule junctions can achieve up to three conductance switching cycles, and the variation in conductance reaches up to four orders of magnitude. Theoretical calculations reveal that the conductance change originates from the different connecting sites and the different anchored configurations of single-molecule junctions provide a significantly different transmission. Our findings provide a reliable strategy to manipulate the mechanical switching and shed light on investigating the intrinsic charge transport of multi-anchored molecules.

Graphical abstract: Single-molecule conductance variations of up to four orders of magnitude via contacting electrodes with different anchoring sites

Supplementary files

Article information

Article type
Communication
Submitted
28 iyl 2021
Accepted
24 sen 2021
First published
06 okt 2021

J. Mater. Chem. C, 2021,9, 16192-16198

Single-molecule conductance variations of up to four orders of magnitude via contacting electrodes with different anchoring sites

Z. Zhu, H. Qu, Y. Chen, C. Zhang, R. Li, Y. Zhao, Y. Zhou, Z. Chen, J. Liu, Z. Xiao and W. Hong, J. Mater. Chem. C, 2021, 9, 16192 DOI: 10.1039/D1TC03506A

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