Complex formation dynamics in a single-molecule electronic device

Wen, Haiming; Li, Wengang; Chen, Jiewei; He, Gen; Li, Longhua; Olson, Mark A.; Sue, Andrew C.‐H.; Stoddart, J. Fraser; Guo, Xuefeng

doi:10.1126/sciadv.1601113

Cited by 85 publications

(76 citation statements)

References 58 publications

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“…In particular, the detection of biological system interactions at the molecular level is critical for basic biology, medical chemistry, clinical diagnosis, and drug discovery. To this end, several methods based on nanomaterials and novel structures have been successfully developed for the manufacture of single‐molecule biosensors, including molecular junctions, Si NWs, CNTs, and nanopores . In the past few years, our group has developed a point decoration strategy for Si NWs, by integrating top‐down lithography with bottom‐up chemical reactions ( Figure a).…”

Section: Ternary Interfaces In Hybrid Devicessupporting

confidence: 49%

Precise Control of Interfacial Charge Transport for Building Functional Optoelectronic Devices

Zhang

Chen

Guo

2019

Adv Materials Technologies

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studies have not only improved device performance, but have even built novel functions. At present, interface engineering has become a research hotspot and has great potential for further applications in diverse fields, ranging from integrated circuits and energy conversion to catalysis and chemical/biosensors. Scientists with various backgrounds have been devoting great efforts to this area, which has moved from the simple improvement of device performance to branch out in broad directions, indicating its interdisciplinarity.As shown in Figure 1c, an important interface for an FET is the semiconductor/ electrode interface, which typically determines the efficiency of charge carrier injection and extraction. In general, the charge injection of a metal/organic semiconductor (OSC) junction can be described in terms of thermal electron emission or tunneling mechanisms, depending on the concentration of defect states inside the bandgap (Figure 1c, left and middle). [1] By carefully selecting the self-assembled monolayer (SAM) or thin buffer interlayer to modify the metal electrode (Figure 1c, right), the interface charge injection barrier can be fine-tuned, thereby significantly reducing the contact resistance of the device. More interestingly, by using a stimuli-responsive conformational isomer as a functional layer to modify the electrode interface, functionalization of the electrodes can be achieved. This concept laid the foundation for the construction of functional devices such as optical/electrical switches, memory, and photodetectors.The semiconductor/dielectric interface is another important interface in FETs, that governs carrier transport (Figure 1d, left), because generation, transport, and regulation of charge carriers all occur in the first few layers (<10 nm) of semiconductors at the interface (Figure 1d, middle). In addition, the modification of the dielectric surface has been shown to help reduce the defects, improve the roughness, change the polarity, and modulate the surface hydrophilic/hydrophobic properties. These changes further affect the transport of carriers at the semiconductor/dielectric interface (Figure 1d, right) and have a significant impact on the morphology of the semiconductor layer. Furthermore, modification of the interface with SAMs or stimuli-responsive layers offers an important and general methodology to improve device performance and even integrate new molecular functionalities, such as photocontrollable memory, superconductivity, and charge-trap memory, into organic electrical circuits. Optoelectronic devices and interfaces therein have captured great attention in both scientific and industrial communities because of the wide variety of their unique properties. From a materials chemistry point of view, each layer and individual component of an optoelectronic device possesses the possibility of flexible chemical modification, making it feasible to dope, mix, and physically/chemically modify the interface. Exploiting the novel properties in optoelectronic devices with diverse la...

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Section: Ternary Interfaces In Hybrid Devicessupporting

confidence: 49%

Precise Control of Interfacial Charge Transport for Building Functional Optoelectronic Devices

Zhang

Chen

Guo

2019

Adv Materials Technologies

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“…The molecular switch is reversible in its operation and can be switched at least five times in solution as monitored by UV-vis-NIR spectroscopy. We envision that this kind of redox switching, accompanied by relative geometrical changes, resulting in the stacking of six radical cationic moieties, could be of potential use in molecular electronics that require bistable switching 15,[50][51][52][53] of electron conductance.…”

Section: Discussionmentioning

confidence: 99%

Densely Charged Dodecacationic [3]- and Tetracosacationic Radial [5]Catenanes

Nguyen

Ferris

Pezzato

et al. 2018

Chem

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Notwithstanding the many synthetic protocols for producing mechanically interlocked molecules (MIMs)-whose unique structural features raise the prospect of their potential use in areas as diverse as molecular electronics and artificial molecular machines-mechanically interlocked structures containing multiple components, which repel each other, remain undocumented for the most part. Herein, we report the efficient syntheses of a 12+ charged [3]catenane and a 24+ charged radial [5]catenane, which consist of three and five mechanically interlocked polycationic rings, respectively, despite their mutual Coulombic repulsion.

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“…1C and the "Kinetic information extracted from the in situ 1 H NMR spectra" section in the Supplementary Materials), as summarized in Fig. 2 (A and B) (solid circles for conductance and hollow circles for NMR) (29,32,33). Therefore, the reaction rates of this process for both measurements were fitted (in Fig.…”

Section: Reaction Kinetics Of the Two-step Cascade Reactionmentioning

confidence: 99%

Electric field–induced selective catalysis of single-molecule reaction

et al. 2019

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Oriented external electric fields (OEEFs) offer a unique chance to tune catalytic selectivity by orienting the alignment of the electric field along the axis of the activated bond for a specific chemical reaction; however, they remain a key experimental challenge. Here, we experimentally and theoretically investigated the OEEF-induced selective catalysis in a two-step cascade reaction of the Diels-Alder addition followed by an aromatization process. Characterized by the mechanically controllable break junction (MCBJ) technique in the nanogap and confirmed by nuclear magnetic resonance (NMR) in bottles, OEEFs are found to selectively catalyze the aromatization reaction by one order of magnitude owing to the alignment of the electric field on the reaction axis. Meanwhile, the Diels-Alder reaction remained unchanged since its reaction axis is orthogonal to the electric fields. This orientation-selective catalytic effect of OEEFs reveals that chemical reactions can be selectively manipulated through the elegant alignment between the electric fields and the reaction axis.

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Complex formation dynamics in a single-molecule electronic device

Abstract: The formation dynamics of a host-guest complex is successfully investigated in graphene-based single-molecule electronic devices.

Cited by 85 publications

References 58 publications

Precise Control of Interfacial Charge Transport for Building Functional Optoelectronic Devices

Precise Control of Interfacial Charge Transport for Building Functional Optoelectronic Devices

Densely Charged Dodecacationic [3]- and Tetracosacationic Radial [5]Catenanes

Electric field–induced selective catalysis of single-molecule reaction

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