Field-induced conformational changes in bimetallic oligoaniline junctions

Sotelo, Juan C.; Yan, Liuming; Wang, Michael; Seminario, Jorge M.

doi:10.1103/physreva.75.022511

Cited by 44 publications

(42 citation statements)

References 44 publications

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“…The programs Gaussian‐03 24 and Crystal‐03 25, 26 were used to determine the electronic structures. The program GENIP‐07 11, 27, 28 was used to determine the electron transport. The geometry optimization is done by minimizing the energy, i.e., zeroing the first derivative of the energy with respect to the Cartesian coordinates of all the atoms.…”

Section: Methodsmentioning

confidence: 99%

“…Except when indicated otherwise, we use the LANL2DZ basis set for heavy atoms such as gold in conjunction with the 6‐31G(d) basis set for the smaller atoms (S, F, O, N, C, H) as we have done in the past 2, 3, 10–12, 20. The current–voltage relationships for these molecules are calculated using a DFT and Green's function combined approach in the program GENIP 11, 27, 28. The bulk density of state (DOS) for gold is calculated using the using the Crystal‐03 program 25, 26.…”

Section: Methodsmentioning

confidence: 99%

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Effects of substituents on molecular devices

Tovar

Johnson

Ashline

et al. 2008

Int J of Quantum Chemistry

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ABSTRACT:The current-voltage characteristics of small aliphatic chains of alkanes, alkenes, alkynes, and oligophenylene-ethylenes, with and without substituents and terminated in sulfur attached nanosized gold electrodes are determined using ab initio procedures for discrete and extended systems in a density functional theory-Green function's approach where most of the chemistry is considered. It is found that the current-voltage characteristics of small molecules can be tailored by the addition of substituents.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effects of substituents on molecular devices

Tovar

Johnson

Ashline

et al. 2008

Int J of Quantum Chemistry

Self Cite

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“…A droplet (2 µl) of the dispersion (5) with a concentration of 1.2×10 11 particles/mL was cast on the top of a metal needle (6), connected to a three-axis micromanipulator (7) [15]. Furthermore, the needle with the droplet was rotated by 180 • and driven to the nanogap electrodes where the droplet was deposited (5 ). The position of the droplet edge (contact line) on the sample was controlled by a light microscope (3).…”

Section: Positioning Of Nanoparticle Chains In Between Nanogap Electrmentioning

confidence: 99%

“…The inherent possibility of a switching between different molecular conformations represents one peculiarity of these molecules which can strongly influence charge transport. Several types of switching mechanisms can play a role, electrically induced switching is one of them [4,5]. There, a single molecule can be electrically turned between a high and a low conductance state.…”

Section: Introductionmentioning

confidence: 99%

Charge Transport in Chain of Nanoparticles

Govor

Parisi

2015

Bottom-Up Self-Organization in Supramolecular Soft Matter

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We have bridged a pair of gold electrodes through chains and arrays of gold nanoparticles, coated with citrate molecules. We performed a systematic and comparative analysis of current-voltage (I − V ) characteristics for chains of nanoparticles, having variable length and configuration. The I − V characteristics I ∼ (V − V t ) ζ (with voltage threshold V t ≈ 0 and scaling exponent ζ ≈ 1) are attributed to hopping transport. Current fluctuations at a fixed bias voltage were observed, with a fluctuation amplitude proportional to the voltage applied. We found that the resistance of the bridge is not only a function of the number of molecular contacts, but also depends on the strength of the individual interactions between metal conductor and molecules. IntroductionDue to their optical and electronic properties, arrays of metallic nanoparticles (NPs) have attracted much attention in materials science. Charge transport through nanoparticle assemblies represents a fundamental process that controls their physical properties which are determined by the coupling and arrangement of individual NPs, and depend on their size, shape, and composition. Theory and experiments unveil that, at sufficiently low temperature below a threshold voltage V t , no current flows through the particle array, while above V t the current increases, according to the power law I ∼ (V − V t ) ζ with ζ = 1 in a one-dimensional (1D) and ranging between 5/3 and 2 in a two-dimensional (2D) array [1][2][3]. I denotes the current, V the voltage. Electronic coupling between individual particles is one of the fundamental parameters that governs charge transport in NP arrays. The coupling is influenced by inter-NP spacing and by stabilizer molecules capping the NPs. The inherent possibility of a switching between different molecular conformations represents one

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“…The inherent possibility of a switching between different molecular conformations represents one peculiarity of these molecules which can strongly influence charge transport. Several types of switching mechanisms can play a role, electrically induced switching is one of them . There, a single molecule can be electrically turned between a high and a low conductance state.…”

Section: Introductionmentioning

confidence: 99%

Charge transport in nanoparticle chains influenced by stabilizer molecules

Govor

Bauer

Reiter

et al. 2013

Physica Status Solidi (a)

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We have bridged a pair of gold electrodes through chains and arrays of gold nanoparticles (NPs), which were stabilized by a coating of citrate molecules. We performed a systematic and comparative analysis of current-voltage (I-V) characteristics for chains of NPs having variable lengths and configurations. Besides stochastic current fluctuations at a constant bias voltage and quasi-periodic fluctuations of the differential conductance arising from conformational changes of citrate molecules, we also observed that the arrangement and distribution of NPs can be changed by the applied electric field, contributing to conductance fluctuations and leading to irreversible changes and finally rupture of the conducting bridge. Although in all cases gold is bridged by the same citrate molecules, a significantly higher resistance between gold electrodes and the citrate coated gold NPs was found as compared to the resistance between identical NPs. This difference is attributed to the fact that citrate molecules are chemically attached to the NPs, but are only physically interacting with the electrodes. Thus, the resistance of the bridge is not only a function of the number of molecular contacts but also depends on the strength of the individual interactions between metal conductor and molecules.

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Field-induced conformational changes in bimetallic oligoaniline junctions

Cited by 44 publications

References 44 publications

Effects of substituents on molecular devices

Effects of substituents on molecular devices

Charge Transport in Chain of Nanoparticles

Charge transport in nanoparticle chains influenced by stabilizer molecules

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