Electrical and SERS detection of disulfide-mediated dimerization in single-molecule benzene-1,4-dithiol junctions

Zheng, Jueting; Liu, Junyang; Zhuo, Yijing; Li, Ruihao; Jin, Xi; Yang, Yang; Chen, Zhaobin; Shi, Jia; Xiao, Zongyuan; Hong, Wenjing; Tian, Zhong‐Qun

doi:10.1039/c8sc00727f

Cited by 64 publications

(49 citation statements)

References 54 publications

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“…To determine the microscopic structures of the M-2D-vdWHs, we constructed the 2D conductance-distance histogram for the graphene M-2D-vdWHs with PAHs and then statistically analyzed their singlemolecule conductance features (28). Figure 2A gives the 2D histogram for the graphene M-2D-vdWHs with PAH 3, while Fig.…”

Section: Determine the Microscopic Structures Of The Graphene M-2d-vdwhsmentioning

confidence: 99%

Cross-plane transport in a single-molecule two-dimensional van der Waals heterojunction

Zhao

et al. 2020

Sci. Adv.

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Two-dimensional van der Waals heterojunctions (2D-vdWHs) stacked from atomically thick 2D materials are predicted to be a diverse class of electronic materials with unique electronic properties. These properties can be further tuned by sandwiching monolayers of planar organic molecules between 2D materials to form molecular 2D-vdWHs (M-2D-vdWHs), in which electricity flows in a cross-plane way from one 2D layer to the other via a single molecular layer. Using a newly developed cross-plane break junction technique, combined with density functional theory calculations, we show that M-2D-vdWHs can be created and that cross-plane charge transport can be tuned by incorporating guest molecules. The M-2D-vdWHs exhibit distinct cross-plane charge transport signatures, which differ from those of molecules undergoing in-plane charge transport.

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Section: Determine the Microscopic Structures Of The Graphene M-2d-vdwhsmentioning

confidence: 99%

Cross-plane transport in a single-molecule two-dimensional van der Waals heterojunction

Zhao

et al. 2020

Sci. Adv.

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“…This inspires us to use electrons as a link to explore the relationship between PL and SERS in the CT mechanism and investigate how PL affects the SERS signal. SERS technology has been widely used to monitor the charge transport of substrate-molecular junctions 11,12 . Generally, when a semiconductor is used as a SERS substrate, only the CT enhancement mechanism contributes to SERS signals.…”

Section: Introductionmentioning

confidence: 99%

Monitoring the charge-transfer process in a Nd-doped semiconductor based on photoluminescence and SERS technology

et al. 2020

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Surface-enhanced Raman scattering (SERS) and photoluminescence (PL) are important photoexcitation spectroscopy techniques; however, understanding how to analyze and modulate the relationship between SERS and PL is rather important for enhancing SERS, having a great effect on practical applications. In this work, a charge-transfer (CT) mechanism is proposed to investigate the change and relationships between SERS and PL. Analyzing the change in PL and SERS before and after the adsorption of the probe molecules on Nd-doped ZnO indicates that the unique optical characteristics of Nd 3+ ions increase the SERS signal. On the other hand, the observed SERS can be used to explain the cause of PL background reduction. This study demonstrates that modulating the interaction between the probe molecules and the substrate can not only enhance Raman scattering but also reduce the SERS background. Our work also provides a guideline for the investigation of CT as well as a new method for exploring fluorescence quenching.

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“…This change in the conductance is attributed to two different configurations of the peptide at acidic and neutral pH. The single‐molecule charge transport investigations through azulene derivatives with different connectivities in the presence of protons show that a higher conductance value of more than one order of magnitude for the protonated state compared with the neutral state . Liu et al.…”

Section: Introductionmentioning

confidence: 99%

“…The singlemolecule charget ransport investigations through azulene derivativesw ith different connectivities in the presence of protons show that ah igher conductance value of more than one order of magnitude fort he protonated state comparedw ith the neutral state. [14,15] Liu et al showedt hrough single-molecule conductance measurements an enhancement of conductance of up to 200 times when phenothiazine derivatives undergo reactionint he presence of acid oxidants. [16] To wards more selective sensing, Lewis acid-base interactions are introducedfor the sensingo ff luoridei ons through boronfluoride coordination, whereas the conductance difference is limitedt oa round 4t imes and is not sufficient for sensing applications.…”

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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Electrical and SERS detection of disulfide-mediated dimerization in single-molecule benzene-1,4-dithiol junctions

Abstract: Electrical and in situ SERS characterization of the benzene-1,4-dithiol (BDT) junction suggested that dimerization of BDT contributed to the low conductance.

Cited by 64 publications

References 54 publications

Cross-plane transport in a single-molecule two-dimensional van der Waals heterojunction

Cross-plane transport in a single-molecule two-dimensional van der Waals heterojunction

Monitoring the charge-transfer process in a Nd-doped semiconductor based on photoluminescence and SERS technology

Quantum Interference Enhanced Chemical Responsivity in Single‐Molecule Dithienoborepin Junctions

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