Mapping Buried Hydrogen-Bonding Networks

Thomas, John C.; Goronzy, Dominic P.; Dragomiretskiy, Konstantin; Zosso, Dominique; Gilles, Jérôme; Osher, Stanley; Bertozzi, Andrea L.; Weiss, Paul S.

doi:10.1021/acsnano.6b01717

Cited by 23 publications

(43 citation statements)

References 54 publications

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“…158 Strong Inter-molecular interactions also contribute to the endurance of the monolayer. 143,144,186 Elimination of defects is critical not only for electrical transport across them, but also to prevent diffusion through the monolayer of small molecules (e.g., O 2 or evaporated metal atoms) that alter the surface chemistry.…”

Section: Order and Dense Packingmentioning

confidence: 99%

Large-Area, Ensemble Molecular Electronics: Motivation and Challenges

2017

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We review charge transport across molecular monolayers, which is central to molecular electronics (MolEl), using large-area junctions (NmJ). We strive to provide a wide conceptual overview of three main subtopics. First, a broad introduction places NmJ in perspective to related fields of research and to single-molecule junctions (1mJ) in addition to a brief historical account. As charge transport presents an ultrasensitive probe for the electronic perfection of interfaces, in the second part ways to form both the monolayer and the contacts are described to construct reliable, defect-free interfaces. The last part is dedicated to understanding and analyses of current-voltage (I-V) traces across molecular junctions. Notwithstanding the original motivation of MolEl, I-V traces are often not very sensitive to molecular details and then provide a poor probe for chemical information. Instead, we focus on how to analyze the net electrical performance of molecular junctions, from a functional device perspective. Finally, we point to creation of a built-in electric field as a key to achieve functionality, including nonlinear current-voltage characteristics that originate in the molecules or their contacts to the electrodes. This review is complemented by a another review that covers metal-molecule-semiconductor junctions and their unique hybrid effects.

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Section: Order and Dense Packingmentioning

confidence: 99%

Large-Area, Ensemble Molecular Electronics: Motivation and Challenges

2017

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“…[ 42 ] Then, in the case of the AT SAM, the contrast variations observed on the image of the photo‐induced current can entirely be attributed to local variations of the tunnel barrier height. [ 43–45 ] In more detail, the modulated current maps I ω obtained for both the AT SAM and the D/A system, show that the photocurrent contrast associated with each molecule forms adjacent bright and dark lobes. In addition, the orientation of these lobes faithfully follows the irradiation axis of the tunnel junction by the laser beam.…”

Section: Resultsmentioning

confidence: 99%

Nanoscale Mapping of Photo‐Induced Charge Carriers Generated at Interfaces of a Donor/Acceptor 2D‐Assembly by Light‐Assisted‐Scanning Tunneling Microscopy

Lombana

Battaglini

Zrig

et al. 2020

Adv Materials Inter

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Charge transfers between donor (D) and acceptor (A) species at their excited state in a light‐assisted STM setup (LA‐STM) are investigated. Through an all‐solution process, supramolecular architectures deposited on the Au(111) surface and made of 2D islands of PC71BM (electron acceptor) on top of a single layer of the polymer PTB7 (electron donor) are elaborated. The STM junction under modulated laser irradiation exhibits a strong background of photothermal signal attributed both to vertical and lateral expansion of the tip. However, from the analysis of differential images obtained at opposite voltages, additional photocurrent peaks located at the PTB7/PC71BM interfaces are detected, providing evidence for active charge transfer between D/A species at their excited state. This phenomenon is discussed in the framework of a charge transport model at interfaces in organic electronics systems.

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“…Alkanethiol monolayers have been reported to desorb upon exposure to strong acids/bases, oxidizing/reducing conditions, particular solvents or temperatures above ∼100 °C. 52–54 Their stability is also a function of intermolecular interactions such as van der Waals forces 55 or hydrogen bonding, 56,57 not just the Au–S bonding motif. After testing different reaction conditions ( e.g.…”

Section: Resultsmentioning

confidence: 99%