Analysis of charge transport in arrays of 28 kDa nanocrystal gold molecules

Quinn, Aidan J.; Biancardo, Matteo; Floyd, Liam; Belloni, Maura; Ashton, Peter R.; Preece, Jon A.; Bignozzi, Carlo Alberto; Redmond, Gareth

doi:10.1039/b508404k

Cited by 26 publications

(27 citation statements)

References 32 publications

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“…Experimental studies of 2D systems show IV characteristics with similar features to those observed in the 1D systems shown above, including a Coulomb blockade, Coulomb staircases, and non-linear IV relationships in the "on" state [4,[20][21][22][23]26,27]. Preliminary investigations of two-dimensional (2D) random arrays of metallic nano-scale islands were carried out using MITS, and are briefly presented here in order to give a view of capabilities for future work.…”

Section: Two-dimensional Devicesmentioning

confidence: 90%

Simulation of Charge Transport in Disordered Assemblies of Metallic Nano-Islands: Application to Boron-Nitride Nanotubes Functionalized with Gold Quantum Dots

et al. 2014

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In this study, we investigate the charge-transport behavior in a disordered one-dimensional (1D) chain of metallic islands using the newly developed multi-island transport simulator (MITS) based on semi-classical tunneling theory and kinetic Monte Carlo simulation. The 1D chain is parameterized to model the experimentally-realized devices studied by Lee et al. [Advanced Materials 25, 4544-4548 (2013)], which consists of nano-meter-sized gold islands randomly deposited on an insulating boron-nitride nanotube. These devices show semiconductorlike behavior without having semiconductor materials. The effects of disorder, device length, temperature, and source-drain bias voltage (V SD ) on the current are examined. Preliminary results of random assemblies of gold nano-islands in two dimensions (2D) are also examined in light of the 1D results.At T = 0 K and low source-drain bias voltages, the disordered 1D-chain device shows charge-transport characteristics with a well-defined Coulomb blockade (CB) and Coulomb staircase (CS) features that are manifestations of the nanometer size of the islands and their separations. In agreement with experimental observations, the CB and the blockade threshold voltage (V th ) at which the device begins to conduct increases linearly with increasing chain length. The CS structures are more pronounced in longer chains, but disappear at high V SD . Due to tunneling barrier suppression at high bias, the current-voltage characteristics for V SD > V th follow a non-linear relationship. Smaller islands have a dominant effect on the CB and V th due to capacitive effects. On the other hand, the wider junctions with their large tunneling resistances predominantly determine the overall device current. This study indicates that smaller islands with smaller inter-island spacings are better suited for practical applications. Temperature has minimal effects on high-bias current behavior, but the CB is diminished as V th decreases with increasing temperature.In 2D systems with sufficient disorder, our studies demonstrate the existence of a dominant conducting path (DCP) along which most of the current is conveyed, making the device effectively quasi-1-dimensional. The existence of a DCP is sensitive to the device structure, but can be robust with respect to changes in V SD . 731

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Section: Two-dimensional Devicesmentioning

confidence: 90%

Simulation of Charge Transport in Disordered Assemblies of Metallic Nano-Islands: Application to Boron-Nitride Nanotubes Functionalized with Gold Quantum Dots

et al. 2014

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“…[23][24][25][26] However, in these earlier studies, the conductivity profiles exhibited no characteristics of quantized charging of the particle molecular capacitance. It should be noted that the fundamental physics behind the discrete charging/discharging processes is attributable to the (sub)attofarad (aF) molecular capacitance (C MPC ) of these nanoentities, which renders the energetic barrier (e 2 /2C MPC ) for single electron transfer larger than the thermal kinetic energy (k B T, k B the Boltzmann constant).…”

mentioning

confidence: 90%

“…In the above studies with Ag or Au particle monolayers, 4,[21][22][23][24][25][26] most of the particles were too big and/or too polydisperse, and consequently no quantized charging was observed in these particle films.…”

mentioning

confidence: 99%

Discrete charge transfer in nanoparticle solid films

Chen

2007

J. Mater. Chem.

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A brief overview of the recent progress in single electron transfer (SET) in nanoparticle solid films is presented. In these studies, Langmuir-based techniques were employed to control the interparticle interactions, and the ensemble conductivity was evaluated by electrochemical measurements. Deliberate manipulation of the ensemble structure and temperature led to the optimization of the conductivity properties where SET was initiated across a nanoparticle solid film.

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“…Especially, the dependence of the charge-transport process on the interparticle distances and structural properties of the stabilizing ligands is of major interest. [1][2][3][4][5][6] For example, Murray and co-workers [7,8] showed that the conductivity of 3D films from n-alkylthiol-stabilized gold nanoparticles (AuNPs) decays exponentially with the length of the ligands' alkyl chain. Similar results were reported by Brust and co-workers, [9,10] and others, [11] who studied the charge transport in networked AuNP films.…”

Section: Introductionmentioning

confidence: 99%

Networked Gold‐Nanoparticle Coatings on Polyethylene: Charge Transport and Strain Sensitivity

Voßmeyer¹,

Stolte²,

Ijeh³

et al. 2008

Adv Funct Materials

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Networked films, comprising gold nanoparticles (ca. 4 nm core diameter) and 1,9‐nonanedithiol, are deposited onto oxidized low‐density polyethylene (LDPE) substrates via layer‐by‐layer self‐assembly. Scanning electron microscopy and transmission electron microscopy images reveal a compact coating with a granular, nanoscale morphology. Conductance measurements at variable temperature are consistent with an Arrhenius‐type activation of charge transport (activation energy: 52 meV). The excellent mechanical robustness of the coatings allows for studying their potential application as strain gauges. Expanding the films by up to 3% is accompanied by a reversible and approximately linear increase in resistance of up to approximately 50% (gauge factor ca. 17). Analyzing the results with an activated tunneling model suggests that the average increase in interparticle distances is significantly smaller than the geometric expansion at the substrate surface.

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Analysis of charge transport in arrays of 28 kDa nanocrystal gold molecules

Cited by 26 publications

References 32 publications

Simulation of Charge Transport in Disordered Assemblies of Metallic Nano-Islands: Application to Boron-Nitride Nanotubes Functionalized with Gold Quantum Dots

Simulation of Charge Transport in Disordered Assemblies of Metallic Nano-Islands: Application to Boron-Nitride Nanotubes Functionalized with Gold Quantum Dots

Discrete charge transfer in nanoparticle solid films

Networked Gold‐Nanoparticle Coatings on Polyethylene: Charge Transport and Strain Sensitivity

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