Identifying Diversity in Nanoscale Electrical Break Junctions

Martı́n, Santiago; Grace, Iain; Bryce, Martin R.; Wang, Changsheng; Jitchati, Rukkiat; Batsanov, Andrei S.; Higgins, Simon J.; Lambert, Colin J.; Nichols, Richard J.

doi:10.1021/ja103327f

Cited by 129 publications

(164 citation statements)

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“…This is an important consideration as for certain classes of -conjugated molecules, for instance oligo(phenylene)ethynylene (OPE) derivatives, it has been shown that proximal molecular bridges can -stack in molecular electrical junctions and can, on occasions, give rise to additional complications in the conductance signatures of such compounds. 20,46 11…”

Section: Resultsmentioning

confidence: 99%

“…19 More direct assessment of the electrical properties of oligoynes can be achieved by wiring them into electrical junctions with metal contacts. 4,20 Here we report conductance measurements of novel molecular wires Me 3 Si-(C≡C) n -SiMe 3 (n = 2, 3, 4, 5; Scheme 1), using STM-based techniques. In particular the influence of the solvent on conductance and -values has been investigated, and complemented by DFT computations of charge transport through the molecular bridge.…”

Section: Introductionmentioning

confidence: 99%

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Solvent Dependence of the Single Molecule Conductance of Oligoyne-Based Molecular Wires

et al. 2015

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Citation for published item:wil nD h vid gF nd elEyw ediD yd y eF nd yerthelD w rieEghristine nd w rqu¡ esEqonz¡ lezD nti go nd frookeD i h rd tF nd fry eD w rtin F nd ge D il r nd perrerD t ime nd rigginsD imon tF nd v m ertD golin tF nd vowD ul tF nd solt w nriqueD h vid nd w rtinD nti go nd xi holsD i h rd tF nd hw rz herD lther nd q r ¡ % E u¡ rezD ¡ % tor wF @PHITA 9 olvent dependen e of the single mole ule ondu t n e of oligoyneE sed mole ul r wiresF9D tourn l of physi l hemistry gFD IPH @PWAF ppF ISTTTEISTURF Further information on publisher's website:This document is the Accepted Manuscript version of a Published Work that appeared in nal form in The Journal of Physical Chemistry C, copyright c American Chemical Society after peer review and technical editing by the publisher. To access the nal edited and published work see http://dx.doi.org/10.1021/acs.jpcc.5b08877. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solvent Dependence of the Single Molecule Conductance of Oligoyne-Based Molecular Wires

et al. 2015

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“…For example, if the Authiol bond is initially near a step edge on the gold nanoparticle, it may jump over this edge to the upper gold layer upon pulling. Recently, Martin et al argued that the latter configuration yields a higher resistance value [19]. 4 We anticipate, however, that the situation will be very different for less rigid molecules.…”

Section: Showing (R( D) − R(0))/r(0) Versus Y and Semilogarithmicallmentioning

confidence: 86%

Controlling the interparticle distance in a 2D molecule–nanoparticle network

Guedon¹,

Zonneveld²,

Valkenier³

et al. 2011

Nanotechnology

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Mechanically controllable break junctions allow for an impressive level of control over the distance between two electrodes, but lack stability at room temperature. On the other hand, two-dimensional (2D) networks of nanoparticles bridged by molecules form a stable device structure for investigating molecular conductance properties. Here, we combine both techniques to create a robust platform for molecular charge transport with control over the inter-electrode distance on the picometer scale. The resistance change due to bending of our structures is dependent on the molecular species present between the nanoparticles.

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“…Polycrystalline gold and platinum disc electrodes with the diameter of 1.6 mm and 2.0 mm, respectively, were used for the preparation of self-assembled monolayers. Thioacetates 2 [58] and 3 [60] were synthesized as reported previously.…”

Section: Methodsmentioning

confidence: 99%

Modification of Electrode Surfaces by Self‐Assembled Monolayers of Thiol‐Terminated Oligo(Phenyleneethynylene)s

et al. 2013

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The wire‐like properties of four S‐(4‐{2‐[4‐(2‐phenylethynyl)phenyl]ethynyl}phenyl) thioacetate derivatives, PhC≡CC6H4C≡CC6H4SAc (1), H2NC6H4C≡CC6H4C≡CC6H4SAc (2), PhC≡CC6H2(OMe)2C≡CC6H4SAc (3) and AcSC6H4C≡CC6H4C≡CC6H4SAc (4) (Figure 1), all of which possess a high degree of conjugation along the oligo(phenyleneethynylene) (OPE) backbone, were investigated as self‐assembled monolayers (SAMs) on gold and platinum electrodes by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The redox probe [Fe(CN)6]4− was used in both the CV and impedance experiments. The results indicate that the thiolates derived from thioacetate‐protected precursor molecules 1 and 2 form well‐ordered monolayers on a gold electrode, whereas SAMs derived from 3 and 4 exhibit randomly distributed pinholes. The electron tunnelling resistance and fractional coverage of SAMs of all four compounds were examined using electron tunnelling theory. The analysis of the results reveal that the well‐ordered SAMs of 1 and 2 exhibit higher charge‐transfer resistance in comparison to the defect‐ridden SAMs of 3 and 4. The additional steric bulk offered by the methoxy groups in 3 is likely to prevent efficient packing within the SAM, leading to a microelectrode behaviour, when assembled on a gold electrode surface. The protected dithiol derivative 4 probably binds to the surface through both terminal groups which prevents dense packing and leads to the formation of a monolayer with randomly distributed pinholes. Atomic force microscopy (AFM) was used to examine the morphology of the monolayers, and height images gave root‐mean‐square (RMS) roughness′s which are in agreement with the proposed SAM structures.

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Identifying Diversity in Nanoscale Electrical Break Junctions

Cited by 129 publications

References 53 publications

Solvent Dependence of the Single Molecule Conductance of Oligoyne-Based Molecular Wires

Solvent Dependence of the Single Molecule Conductance of Oligoyne-Based Molecular Wires

Controlling the interparticle distance in a 2D molecule–nanoparticle network

Modification of Electrode Surfaces by Self‐Assembled Monolayers of Thiol‐Terminated Oligo(Phenyleneethynylene)s

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