Nanoscale Electrical Investigation of Layer‐by‐Layer Grown Molecular Wires

Musumeci, Chiara; Zappalà, Gabriella; Martsinovich, Natalia; Orgiu, Emanuele; Schuster, Swen; Quici, Silvio; Zharnikov, Michael; Troisi, Alessandro; Licciardello, Antonino; Samorı́, Paolo

doi:10.1002/adma.201304848

Cited by 37 publications

(37 citation statements)

References 45 publications

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“…Following other works [37][38][39][40][41][42] we present this data in additional ways to further delineate some differences. We have furthermore analyzed the Fowler-Nordheim (FN) type plot of BPD1 and BPD4 presented in Fig.…”

Section: J-v Measurementsmentioning

confidence: 95%

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Going beyond the self-assembled monolayer: metal intercalated dithiol multilayers and their conductance

et al. 2014

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A study of the self-assembly of silver atom intercalated 5,5 0 -bis(mercaptomethyl)-2,2 0 -bipyridine (BPD; HS-CH 2 -(C 5 H 3 N) 2 -CH 2 -SH) and 1,4-benzenedimethanethiol (BDMT; HS-CH 2 -(C 6 H 4 )-CH 2 -SH)) dithiol (DT) multilayers on gold is presented. The bilayer of these SAMs can be obtained starting from the exposure of a DT monolayer to a concentrated silver ion solution. After grafting the silver atoms on the sulfur end group, the incubation of the resulting DT-Ag SAM in a DT solution leads to the formation of a DT-Ag-DT bilayer. This process was extended to make a multilayer structure. The corresponding changes in these self-assembled layers on Au are characterized by X-ray photoelectron spectroscopy (XPS), spectroscopic ellipsometry (SE) measurements, and I-V characteristics. Our interpretation of evolution in the absorbed layer are based on changes in intensities of peaks in XPS related to S bound to substrate or Ag and in -SH groups, as well as changes in thickness and absorption features in SE measurements. The latter show the evolution in absorbance wavelength as a function of thickness and indicate a decrease in the HOMO-LUMO gap from about 4.5 eV to 4 eV. The I-V characteristics show a significant bias dependence on the number of the BPD layers and there appears to be a transition from tunneling to a hopping regime when going from the single to the multiple layers.

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Section: J-v Measurementsmentioning

confidence: 95%

“…[37][38][39][40][41] We therefore investigated the conductivity behavior for our BPD layers. To obtain reliable measurements of transport properties, it is common to use the mercury or EGaIn (gallium and indium alloy) drop method.…”

Section: Conductance Measurementsmentioning

confidence: 99%

Going beyond the self-assembled monolayer: metal intercalated dithiol multilayers and their conductance

et al. 2014

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“…Saturated hydrocarbon chains such as alkanes are characterized by noticeably higher ˇ values of 0.6-1.0Å −1 [21,33] corresponding to inferior charge transport properties. Significantly lower values of ß (down to 0.001Å −1 ) could only be obtained for MWs with incorporated metal centers, because of the specific alignment of the MOs involved or resonant tunneling [34,35]. In many cases, in depth analysis of the experimental data was performed, providing information on the character and specific characteristics of the charge transfer and correlating these parameters with the electronic structure of the systems studied (see e.g.…”

Section: Introductionmentioning

confidence: 99%

“…In many cases, in depth analysis of the experimental data was performed, providing information on the character and specific characteristics of the charge transfer and correlating these parameters with the electronic structure of the systems studied (see e.g. [13,25,34,35]). …”

Section: Introductionmentioning

confidence: 99%

Probing charge transfer dynamics in self-assembled monolayers by core hole clock approach

Zharnikov

2015

Journal of Electron Spectroscopy and Related Phenomena

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“…In particular, the structural versatility of the coordination molecules, such as bis(terpyridine) metal complexes, has allowed fabrication of ordered structures . Such metal complex wires with long lengths can be fabricated by one‐directional layer junctions, such as Hg/SAM–Au devices, probe junctions of atomic force microscope (AFM) and scanning tunneling microscope (STM), and electrochemical cells . Even though these methods take advantage of the repetitive structure formation using a bottom‐up process, these methods required long synthetic procedures and resulted in length‐dependent tunneling transport through the molecular junction .…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle Linker‐Controlled Molecular Wire Devices Based on Double Molecular Monolayers

Seo

Viet

Hwang

et al. 2019

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Highly conductive molecular wires are an important component for realizing molecular electronic devices and have to be explored in terms of interactions between molecules and electrodes in their molecular junctions. Here, new molecular wire junctions are reported to enhance charge transport through gold nanoparticle (AuNP)‐linked double self‐assembled monolayers (SAMs) of cobalt (II) bis‐terpyridine molecules (e.g., Co(II)(tpyphS)2). Electrical characteristics of the double‐SAM devices are explored in terms of the existence of AuNP. The AuNP linker in the Co(II)(tpyphS)2–AuNP–Co(II)(tpyphS)2 junction acts as an electronic contact that is transparent to electrons. The weak temperature dependency of the AuNP‐linked molecular junctions strongly indicates sequential tunneling conduction through the highest occupied molecular orbitals (HOMOs) of Co(II)(tpyphS)2 molecules. The electrochemical characteristics of the AuNP–Co(II)(tpyphS)2 SAMs reveal fast electron transfer through molecules linked by AuNP. Density functional theory calculations reveal that the molecular HOMO levels are dominantly affected by the formation of junctions. The intermolecular charge transport, controlled by the AuNP linker, can provide a rational design for molecular connection that achieves a reliable electrical connectivity of molecular electronic components for construction of molecular electronic circuits.

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Nanoscale Electrical Investigation of Layer‐by‐Layer Grown Molecular Wires

Abstract: Nanoscopic metal-molecule-metal junctions consisting of Fe-bis(terpyridine)-based ordered nanostructures are grown in layer-by-layer fashion on a solid support. Hopping is demonstrated as the main charge-transport mechanism both experimentally and theoretically.

Cited by 37 publications

References 45 publications

Going beyond the self-assembled monolayer: metal intercalated dithiol multilayers and their conductance

Going beyond the self-assembled monolayer: metal intercalated dithiol multilayers and their conductance

Probing charge transfer dynamics in self-assembled monolayers by core hole clock approach

Nanoparticle Linker‐Controlled Molecular Wire Devices Based on Double Molecular Monolayers

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