Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Three-state single-molecule naphthalenediimide switch
T2 - integration of a pendant redox unit for conductance tuning
AU - Li, Yonghai
AU - Baghernejad, Masoud
AU - Al Galiby, Qusiy
AU - Manrique, David Zsolt
AU - Zhang, Guanxin
AU - Hamill, Joseph
AU - Fu, Yongchun
AU - Broekmann, Peter
AU - Hong, Wenjing
AU - Wandlowski, Thomas
AU - Zhang, Deqing
AU - Lambert, Colin
PY - 2015/11/9
Y1 - 2015/11/9
N2 - We studied charge transport through core-substituted naphthalenediimide (NDI) single-molecule junctions using the electrochemical STM-based break-junction technique in combination with DFT calculations. Conductance switching among three well-defined states was demonstrated by electrochemically controlling the redox state of the pendent diimide unit of the molecule in an ionic liquid. The electrical conductances of the dianion and neutral states differ by more than one order of magnitude. The potential-dependence of the charge-transport characteristics of the NDI molecules was confirmed by DFT calculations, which account for electrochemical double-layer effects on the conductance of the NDI junctions. This study suggests that integration of a pendant redox unit with strong coupling to a molecular backbone enables the tuning of charge transport through single-molecule devices by controlling their redox states.
AB - We studied charge transport through core-substituted naphthalenediimide (NDI) single-molecule junctions using the electrochemical STM-based break-junction technique in combination with DFT calculations. Conductance switching among three well-defined states was demonstrated by electrochemically controlling the redox state of the pendent diimide unit of the molecule in an ionic liquid. The electrical conductances of the dianion and neutral states differ by more than one order of magnitude. The potential-dependence of the charge-transport characteristics of the NDI molecules was confirmed by DFT calculations, which account for electrochemical double-layer effects on the conductance of the NDI junctions. This study suggests that integration of a pendant redox unit with strong coupling to a molecular backbone enables the tuning of charge transport through single-molecule devices by controlling their redox states.
KW - break junction
KW - electrochemical gating
KW - molecular electronics
KW - naphthalenediimide
KW - single molecule studies
KW - QUANTUM INTERFERENCE
KW - JUNCTION EVOLUTION
KW - CHARGE-TRANSPORT
KW - BREAK JUNCTION
KW - ELECTRONICS
KW - INTERFACES
KW - PLATFORM
U2 - 10.1002/anie.201506458
DO - 10.1002/anie.201506458
M3 - Journal article
VL - 54
SP - 13586
EP - 13589
JO - Angewandte Chemie International Edition
JF - Angewandte Chemie International Edition
SN - 1433-7851
IS - 46
ER -