Graphene-molecule-graphene single-molecule junctions to detect electronic reactions at the molecular scale

Article Chemistry, Physical

Investigation of plasma-assisted functionalization of pristine single layer graphene

B. Tincu et al.

Summary: This paper presents a novel approach to achieve structural conversion of single-layer graphene through low O-2 plasma treatment, which has significant application potential in the field of biosensors.

CHEMICAL PHYSICS LETTERS (2022)

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Article Chemistry, Multidisciplinary

Accurate Single-Molecule Kinetic Isotope Effects

Yilin Guo et al.

Summary: An accurate single-molecule kinetic isotope effect (sm-KIE) has been used to overcome the limitations of conventional ensemble KIE and provide a more accurate and sensitive determination method. This method has demonstrated high detection sensitivity and accuracy in observing the TS structures and multidimensional regulation of Claissen rearrangement.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Chemistry, Multidisciplinary

Real-time observation of the dynamics of an individual rotaxane molecular shuttle using a single-molecule junction

Sujun Chen et al.

Summary: Measurements on single molecules reveal features that are difficult to detect using techniques that probe averaged properties of many molecules. These measurements provide new opportunities to study the structure and dynamics of synthetic molecular machines.

CHEM (2022)

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Article Multidisciplinary Sciences

Orbital-resolved visualization of single-molecule photocurrent channels

Miyabi Imai-Imada et al.

Summary: This study combines a scanning tunnelling microscope (STM) with localized plasmon fields driven by a tunable laser to directly visualize the photocurrent channels through the molecular orbitals of a single molecule at atomic-scale resolution. The direction and spatial distribution of the photocurrent were found to be sensitive to the bias voltage, and counter-flowing photocurrent channels were detected even at a voltage where the averaged photocurrent is close to zero. The competition between photoinduced electron transfer (PET) and photoluminescence was also observed, and the relaxation pathway of the excited molecule could be controlled by positioning the STM tip with three-dimensional, atomic precision.

NATURE (2022)

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Article Multidisciplinary Sciences

Exchange-induced spin polarization in a single magnetic molecule junction

Tian Pei et al.

Summary: In this study, a single-molecule magnet is designed and its spin exchange is utilized to control the current in a single-molecule junction. The results demonstrate the observable exchange-split spin states in the smallest unit of a single magnetic molecule. This opens up a new path for using spin exchange in molecular electronics.

NATURE COMMUNICATIONS (2022)

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Article Materials Science, Multidisciplinary

Complete deciphering of the dynamic stereostructures of a single aggregation-induced emission molecule

Caiyao Yang et al.

Summary: The realization of functional molecular devices relies on a deep understanding of the structure-property relationship of molecules. However, due to limited detection sensitivity and temporal resolution of current methods, there are few reports on real-time probing of dynamic changes in molecular stereostructures at the single-molecule level. In this study, we present a thorough investigation of the dynamic stereostructures of a single aggregation-induced emission molecule using molecular junctions. The results provide new insights into the development of ultra-sensitive devices and suggest that further integration with optical measurements can enable synchronous monitoring of single-molecule photochemistry and photophysics.

MATTER (2022)

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Article Chemistry, Multidisciplinary

Charge transport through single-molecule bilayer-graphene junctions with atomic thickness

Shiqiang Zhao et al.

Summary: This study fabricates sandwiched single-molecule bilayer-graphene junctions via vdW interactions and investigates their electrical transport properties. The results reveal the importance of the size, layer number, and angle between graphene flake and peripheral groups in determining the cross-plane charge transport through molecular graphene in these junctions.

CHEMICAL SCIENCE (2022)

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Article Nanoscience & Nanotechnology

Highly nonlinear transport across single-molecule junctions via destructive quantum interference

Julia E. Greenwald et al.

Summary: Researchers have successfully created a molecular system where the constructive quantum interference between certain molecular orbitals is suppressed, while the destructive interference between other molecular orbitals is enhanced, leading to highly nonlinear single-molecule circuits. They demonstrated the effectiveness of this strategy using fluorene oligomers containing a central benzothiadiazole unit, achieving a reproducible modulation of the conductance of a 6-nm molecule by more than 10,000 at room temperature.

NATURE NANOTECHNOLOGY (2021)

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Article Multidisciplinary Sciences

Electric field-catalyzed single-molecule Diels-Alder reaction dynamics

Chen Yang et al.

Summary: Precise time trajectories and detailed reaction pathways of the Diels-Alder reaction were observed using single-molecule detection, confirming the concerted mechanism and clarifying the role of charge transfer complexes. An unprecedented stepwise pathway was verified at high temperatures in a high-voltage electric field, demonstrating the electric field-catalyzed mechanism for mechanistic control.

SCIENCE ADVANCES (2021)

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Article Chemistry, Multidisciplinary

Atomically Precise Engineering of Single-Molecule Stereoelectronic Effect

Linan Meng et al.

Summary: Charge transport in a single-molecule junction is highly sensitive to both the internal electronic structure of a molecule and its microscopic environment. The introduction of an azobenzene side-group at the central ring delicately modulates charge transport in the backbone via a single-molecule stereoelectronic effect. This tunability offers a new route to precisely engineer multiconfigurational single-molecule memories, switches, and sensors.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Chemistry, Multidisciplinary

Tunable Symmetry-Breaking-Induced Dual Functions in Stable and Photoswitched Single-Molecule Junctions

Na Xin et al.

Summary: This study achieved gate-controlled rectifying function and high-performance field effect in a single-molecule photoswitch. By tuning the molecular orbitals separately under gate electric fields, the symmetric orbital shifting was realized, enhancing molecular symmetry breaking and improving field-effect performance. The gate-controlled symmetry-breaking effect can be switched on/off by isomerizing the DAE unit, providing a new scheme for building high-performance multifunctional molecular nanocircuits.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

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Article Multidisciplinary Sciences

A single-molecule electrical approach for amino acid detection and chirality recognition

Zihao Liu et al.

Summary: By utilizing a single-molecule electrical methodology based on stable graphene-molecule-graphene structures, amino acids can be efficiently discriminated by varying pH values. Experimental results demonstrate the ability to identify amino acids based on different host-guest interactions, enabling accurate measurements within nanoseconds.

SCIENCE ADVANCES (2021)

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Article Nanoscience & Nanotechnology

Unveiling the full reaction path of the Suzuki-Miyaura cross-coupling in a single-molecule junction

Chen Yang et al.

Summary: Conventional analytic techniques provide valuable insights on reaction mechanisms, but single-molecule junctions offer real-time detection of molecular processes, particularly in Suzuki-Miyaura coupling reactions. Integrating a single-molecule Pd catalyst into graphene junctions enables electrical monitoring of the complete catalytic cycle and resolves controversial mechanisms.

NATURE NANOTECHNOLOGY (2021)

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Article Chemistry, Multidisciplinary

Accurate Single-Molecule Indicator of Solvent Effects

Yilin Guo et al.

Summary: This study introduces a method to analyze the microscopic structure and interaction in solvents from a single-molecule perspective using a single-molecule electrical nanocircuit. It detects the heterogeneity or homogeneity of solvents at the molecular level and develops real-time event spectroscopy to study dynamic characteristics. The development of a unique high-resolution indicator with single-molecule and single-event accuracy allows for in-depth analysis of solvent effects and optimization of chemical reactions and biological processes in solution.

JACS AU (2021)

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Article Materials Science, Multidisciplinary

Single-molecule electrical spectroscopy of organocatalysis

Chen Yang et al.

Summary: The study established an in situ label-free electrical detection platform and utilized universal single-molecule electrical spectroscopy to decipher the mechanism of a benzoin reaction. Experimental and theoretical results consistently validated the accuracy and reliability of the spectroscopy, while also revealing local interactions between catalysts and substrates.

MATTER (2021)

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Article Chemistry, Multidisciplinary

Graphene nanogaps for the directed assembly of single-nanoparticle devices†

John J. Cully et al.

Summary: The synthesis of low-dimensional materials with unique properties has opened up new possibilities for creating hybrid nanomaterial devices. However, challenges remain in integrating individual nanoparticles into devices at scale. A graphene nanogap platform has been developed to address this issue, allowing for the capture and integration of single nanoparticles for applications in novel devices and optoelectronics.

NANOSCALE (2021)

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Review Chemistry, Multidisciplinary

Single-Molecule Electrical Detection: A Promising Route toward the Fundamental Limits of Chemistry and Life Science

Yu Li et al.

ACCOUNTS OF CHEMICAL RESEARCH (2020)

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Control of Unipolar/Ambipolar Transport in Single-Molecule Transistors through Interface Engineering

Na Xin et al.

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Side-group chemical gating via reversible optical and electric control in a single molecule transistor

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NATURE COMMUNICATIONS (2019)

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Robust graphene-based molecular devices

Maria El Abbassi et al.

NATURE NANOTECHNOLOGY (2019)

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Understanding resonant charge transport through weakly coupled single-molecule junctions

James O. Thomas et al.

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Concepts in the design and engineering of single-molecule electronic devices

Na Xin et al.

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Distinguishing Diketopyrrolopyrrole Isomers in Single-Molecule Junctions via Reversible Stimuli-Responsive Quantum Interference

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JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2018)

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Electrochemical and Electrostatic Cleavage of Alkoxyamines

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Label-Free Dynamic Detection of Single-Molecule Nucleophilic-Substitution Reactions

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Direct observation of single-molecule hydrogen-bond dynamics with single-bond resolution

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Building nanogapped graphene electrode arrays by electroburning

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Anchor Groups for Graphene-Porphyrin Single-Molecule Transistors

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Tuning Charge Transport in Aromatic-Ring Single-Molecule Junctions via Ionic-Liquid Gating

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Large Conductance Variations in a Mechanosensitive Single-Molecule Junction

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Spin-state dependent conductance switching in single molecule-graphene junctions

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Graphene-molecule-graphene single-molecule junctions to detect electronic reactions at the molecular scale

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