Radical‐Enhanced Charge Transport in Single‐Molecule Phenothiazine Electrical Junctions

Liu, Junyang; Zhao, Xintong; Al-Galiby, Qusiy; Huang, Xiaoyan; Zheng, Jueting; Li, Ruihao; Huang, Cancan; Yang, Yang; Shi, Jia; Manrique, David Zsolt; Lambert, Colin J.; Bryce, Martin R.; Hong, Wenjing

doi:10.1002/anie.201707710

Cited by 75 publications

(74 citation statements)

References 58 publications

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“…Conductance-Distance Measurement of Single-Molecule OAE2 Junctions Typical conductance-distance curves of the OAE2 molecule from MCBJ experiments in solution 24,34,35 are shown in Figure 2A (see Figure 1B and Experimental Procedures for details). Both opening and closing curves [36][37][38] display clear plateaus at around 10 À3 G 0 (where G 0 is the conductance quantum, which equals 2e 2 /h).…”

Section: Resultsmentioning

confidence: 99%

Transition from Tunneling Leakage Current to Molecular Tunneling in Single-Molecule Junctions

Liu

Zhao

Zheng

et al. 2019

Chem

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Tunneling leakage is a major inevitable quantum obstacle that hinders further miniaturization of electronic devices. To explore the miniaturization limits of molecular electronics, the oligo(aryleneethynylene) (OAE) molecules were employed to investigate the transition distance between through-space tunneling and molecular tunneling. For the shortest OAE molecule, the intrinsic singlemolecule charge transport can be outstripped from tunneling leakage down to 0.66 nm, suggesting the potential to push the miniaturization limit of molecular electronic devices to the angstrom scale.

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Section: Resultsmentioning

confidence: 99%

Transition from Tunneling Leakage Current to Molecular Tunneling in Single-Molecule Junctions

Liu

Zhao

Zheng

et al. 2019

Chem

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“…Liu et al. showed through single‐molecule conductance measurements an enhancement of conductance of up to 200 times when phenothiazine derivatives undergo reaction in the presence of acid oxidants …”

Section: Introductionmentioning

confidence: 99%

Quantum Interference Enhanced Chemical Responsivity in Single‐Molecule Dithienoborepin Junctions

Baghernejad

Dyck

Bergfield

et al. 2019

Chemistry A European J

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Providing a chemical control over charge transport through molecular junctions is vital to developing sensing applications at the single‐molecule scale. Quantum‐interference effects that affect the charge transport through molecules offer a unique chance to enhance the chemical control. Here, we investigate how interference effects can be harnessed to optimize the response of single molecule dithienoborepin (DTB) junctions to the specific coordination of a fluoride ion in solution. The single‐molecule conductance of two DTB isomers is measured using scanning tunneling microscopy break‐junction (STM‐BJ) before and after fluoride ion exposure. We find a significant change of conductance before and after the capture of a fluoride ion, the magnitude of which depends on the position of the boron atom in the molecular structure. This single‐molecule sensor exhibits switching ratios of up to four orders of magnitudes, suggesting that the boron–fluoride coordination can lead to quantum‐interference effects. This is confirmed by a quantum chemical characterization, pointing toward a cross‐conjugated path through the molecular structure as the origin of the effect.

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“…Recently, there have been increasing efforts to use radicals as an electronic charge carrier for highly conducting organic electronic materials. [10][11][12] SOMO energy levels of molecules exist between HOMO and LUMO. Thus, when radical crystals are formed, SOMO energy levels overlap each other to form a band, forming a smaller band gap than the neutral crystal.…”

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confidence: 99%

Highly Conducting and Flexible Radical Crystals

2020

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Together with high conductivity, high flexibility is an important property required for next generation organic electronic components. Both properties are difficult to achieve together especially when the components are crystalline because of the intrinsic high brittleness of organic molecular crystals. We report an organic radical crystal system that has both high flexibility and high conductivity. The crystal consists of 9,10‐bis(phenylethynyl)anthracene radical cation (BPEA.+) units, and shows flexibility under pressure with high conductivity in ambient condition exhibiting average conductivity of 2.68 S cm−1 when normal linear shape, as well as 2.43 S cm−1 when bent. The structural analysis reveals that both a short π–π distance (3.290 Å) between BPEA.+ units that are aligned along the crystal length direction, and the presence of PF6− counter ions induce flexibility and high electrical conductivity.

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Radical‐Enhanced Charge Transport in Single‐Molecule Phenothiazine Electrical Junctions

Cited by 75 publications

References 58 publications

Transition from Tunneling Leakage Current to Molecular Tunneling in Single-Molecule Junctions

Transition from Tunneling Leakage Current to Molecular Tunneling in Single-Molecule Junctions

Quantum Interference Enhanced Chemical Responsivity in Single‐Molecule Dithienoborepin Junctions

Highly Conducting and Flexible Radical Crystals

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