Yan Zhuang, Li Xingxing, Li Yusen, Jia Chuangcheng, Xin Na, Li Peihui, Meng Linan, Zhang Miao, Chen Long, Yang Jinlong, Wang Rongming, Guo Xuefeng
Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, P. R. China.
Beijing National Laboratory for Molecular Sciences, National Biomedical Imaging Center, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
Sci Adv. 2022 Mar 25;8(12):eabm3541. doi: 10.1126/sciadv.abm3541. Epub 2022 Mar 23.
Single-molecule junctions (SMJs) offer a novel strategy for miniaturization of electronic devices. In this work, we realize a graphene-porphyrin-graphene SMJ driven by electric field and proton transfer in two configurations. In the transistor configuration with ionic liquid gating, an unprecedented field-effect performance is achieved with a maximum on/off ratio of ~4800 and a gate efficiency as high as ~179 mV/decade in consistence with the theoretical prediction. In the other configuration, controllable proton transfer, tautomerization switching, is directly observed with bias dependence. Room temperature proton transfer leads to a two-state conductance switching, and more precise tautomerization is detected, showing a four-state conductance switching at high bias voltages and low temperatures. Such an SMJ in two configurations provides new insights into not only building multifunctional molecular nanocircuits toward real applications but also deciphering the intrinsic properties of matters at the molecular scale.
单分子结（SMJs）为电子设备的小型化提供了一种新颖的策略。在这项工作中，我们通过电场和质子转移在两种配置下实现了石墨烯-卟啉-石墨烯单分子结。在具有离子液体门控的晶体管配置中，实现了前所未有的场效应性能，最大开/关比约为4800，栅极效率高达约179 mV/十倍频程，与理论预测一致。在另一种配置中，直接观察到了可控的质子转移，即互变异构开关，其与偏置有关。室温质子转移导致双态电导开关，并且检测到更精确的互变异构，在高偏置电压和低温下显示出四态电导开关。这种具有两种配置的单分子结不仅为构建面向实际应用的多功能分子纳米电路，而且为在分子尺度上解读物质的内在特性提供了新的见解。
