Room-Temperature Coulomb Blockade from Chemically Synthesized Au Nanoparticles Stabilized by Acid–Base Interaction

Kano, Shinya; Azuma, Yasuo; Kanehara, Masayuki; Teranishi, Toshiharu; Majima, Yutaka

doi:10.1143/apex.3.105003

Cited by 43 publications

(53 citation statements)

References 24 publications

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“…This system can be realized experimentally by means of ligand-stabilized metallic nanoparticles [2], [18], [19], [28], [29]. The nanoparticle (NP) is functionalized with an organic ligand acting as a tunneling junction and the single electron transfers between the NP and the external electrode are determined by the Coulomb blockade and tunneling effects [2], [18], [19], [28], [29]. These electron transfers lead to measurable electric potential changes of the order of 100 mV for effective NP capacitances of the order of 1 aF [2], [19], [22], [28], [29].…”

Section: Methodsmentioning

confidence: 99%

“…The nanoparticle (NP) is functionalized with an organic ligand acting as a tunneling junction and the single electron transfers between the NP and the external electrode are determined by the Coulomb blockade and tunneling effects [2], [18], [19], [28], [29]. These electron transfers lead to measurable electric potential changes of the order of 100 mV for effective NP capacitances of the order of 1 aF [2], [19], [22], [28], [29]. For example, the electrochemically determined capacitance of Au 225 (diameter 1.8 nm) is 0.6 aF approximately [30] and other particles like Pd 40 (diameter 1.2 nm) show a capacitance as low as 0.35 aF.…”

Section: Methodsmentioning

confidence: 99%

“…The current–voltage curves of a single ligand-stabilized NP obtained by scanning tunneling spectroscopy can be described by SET equivalent circuits that give tunneling resistances and effective capacitances in the range 100 MΩ – 10 GΩ and 0.1 – 10 aF, respectively [2], [18]–[20], [22], [28]–[30]. A final, potentially useful characteristic of ligand-stabilized metallic nanoparticles is self-assembly in approximately defined nanoarchitectures [18], [19], [28]–[30].…”

Section: Methodsmentioning

confidence: 99%

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Biologically Inspired Information Processing and Synchronization in Ensembles of Non-Identical Threshold-Potential Nanostructures

2013

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Nanotechnology produces basic structures that show a significant variability in their individual physical properties. This experimental fact may constitute a serious limitation for most applications requiring nominally identical building blocks. On the other hand, biological diversity is found in most natural systems. We show that reliable information processing can be achieved with heterogeneous groups of non-identical nanostructures by using some conceptual schemes characteristic of biological networks (diversity, frequency-based signal processing, rate and rank order coding, and synchronization). To this end, we simulate the integrated response of an ensemble of single-electron transistors (SET) whose individual threshold potentials show a high variability. A particular experimental realization of a SET is a metal nanoparticle-based transistor that mimics biological spiking synapses and can be modeled as an integrate-and-fire oscillator. The different shape and size distributions of nanoparticles inherent to the nanoscale fabrication procedures result in a significant variability in the threshold potentials of the SET. The statistical distributions of the nanoparticle physical parameters are characterized by experimental average and distribution width values. We consider simple but general information processing schemes to draw conclusions that should be of relevance for other threshold-based nanostructures. Monte Carlo simulations show that ensembles of non-identical SET may show some advantages over ensembles of identical nanostructures concerning the processing of weak signals. The results obtained are also relevant for understanding the role of diversity in biophysical networks.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Biologically Inspired Information Processing and Synchronization in Ensembles of Non-Identical Threshold-Potential Nanostructures

2013

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“…However, such an effect has not yet been demonstrated experimentally. It is anticipated that the effect of using a selenolate ligand on the conductivity between the gold core and the ligand will be elucidated in the future by comparing the conductivity 96 Regarding the conductivity between the ligand and the Au core, an even more dramatic effect is expected if tellurolate is used as the ligand. 97 With this in mind, we successfully synthesized Au 25 (TePh) n (SC 8 H 17 ) 18−n (n = 1-18) containing TePh in the ligand shell (Figure 7).…”

Section: Studies Of Synthesized Clusters Have Revealed That Changes Imentioning

confidence: 99%

Recent Progress in the Functionalization Methods of Thiolate-Protected Gold Clusters

Kurashige

Niihori

Sharma

et al. 2014

J. Phys. Chem. Lett.

108

125

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Nanomaterials that exhibit both stability and functionality are currently considered to hold great promise as components of nanotechnology devices. Thiolate-protected gold clusters (Aun(SR)m) have long attracted attention as functional nanomaterials. Magic Aun(SR)m clusters are an especially stable group of thiolate-protected clusters that have particularly high potential as functional materials. Although numerous application experiments have been conducted for magic Aun(SR)m clusters, it is important that functionalization methods are also established to allow for effective utilization of these materials. The results of recent research on heteroatom doping and the use of other chalcogenide ligands strongly suggest that these strategies are promising as functionalization methods of magic Aun(SR)m clusters. In this Perspective, we focus on studies relating to three representative types of magic clusters-Au25(SR)18, Au38(SR)24, and Au144(SR)60-and discuss the recent progress and future issues.

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“…Such systems have been extensively studied in experiments over the last two decades. They can exhibit Coulomb blockade at room temperature (21,(29)(30)(31) and their ease of fabrication makes a wide range of barrier materials available for experiments. Following Ref.…”

Section: B Memory Effect In Current-voltage Characteristicsmentioning

confidence: 99%

Single-electron tunneling with slow insulators

et al. 2015

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Usual paradigm in the theory of electron transport is related to the fact that the dielectric permittivity of the insulator is assumed to be constant, no time dispersion. We take into account the "slow" polarization dynamics of the dielectric layers in the tunnel barriers in the fluctuating electric fields induced by single-electron tunneling events and study transport in the single electron transistor (SET). Here "slow" dielectric implies slow compared to the characteristic time scales of the SET charging-discharging effects. We show that for strong enough polarizability, such that the induced charge on the island is comparable with the elementary charge, the transport properties of the SET substantially deviate from the known results of transport theory of SET. In particular, the Coulomb blockade is more pronounced at finite temperature, the conductance peaks change their shape and the current-voltage characteristics show the memory-effect (hysteresis). However, in contrast to SETs with ferroelectric tunnel junctions, here the periodicity of the conductance in the gate voltage is not broken, instead the period strongly depends on the polarizability of the gate-dielectric. We uncover the fine structure of the hysteresis-effect where the "large" hysteresis loop may include a number of "smaller" loops. Also we predict the memory effect in the current-voltage characteristics I(V ), with I(V ) = −I(−V ).

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Room-Temperature Coulomb Blockade from Chemically Synthesized Au Nanoparticles Stabilized by Acid–Base Interaction

Cited by 43 publications

References 24 publications

Biologically Inspired Information Processing and Synchronization in Ensembles of Non-Identical Threshold-Potential Nanostructures

Biologically Inspired Information Processing and Synchronization in Ensembles of Non-Identical Threshold-Potential Nanostructures

Recent Progress in the Functionalization Methods of Thiolate-Protected Gold Clusters

Single-electron tunneling with slow insulators

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