Quantum transport in low-dimensional organic nanostructures

Park, J.G.; Kim, G.T.; Yu, Han Young; McIntosh, Gregory C.; Krstić, Vojislav; Jhang, Sung Ho; Kim, B.; Lee, S.H.; Burghard, Marko; Roth, S.; Park, Y.W.

doi:10.1016/s0040-6090(01)01064-1

Cited by 25 publications

(16 citation statements)

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“…In view of these results the question arises whether Coulomb-blockade effects can also be observed in such inherent quasi-1D systems as conducting polymer nanofibers. In this connection polyacetylene (PA) nanofibers are of particular interest as the model system for nanotransport studies because of the simple chemical structure, well defined polycrystallinity [9], and good ability for doping [10][11][12]. It is shown that at temperature 30 K < T < 300 K doped polymer nanofibers demonstrate some transport features characteristic of quasi-1D systems, namely, series of Luttinger liquids separated by intra molecular barriers [13].…”

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confidence: 99%

Coulomb-blockade transport in quasi-one-dimensional polymer nanofibers

et al. 2005

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We report the low temperature current-voltage (I-V) characteristics studies in quasi one-dimensional conducting polymer nanofibers. We find a threshold voltage V t below which little current flows at temperatures below 30 -40 K. For V > V t current scales as (V/V t -1) ζ , where ζ ~ 1.8 -2.1 at high biases. Differential conductance oscillations are observed whose magnitude increases as temperature decreases below 10 K. We attributed the observed low temperature I-V behavior to Coulomb blockade effects with a crossover to Luttinger liquid-like behavior at high temperature. We demonstrate that at low temperatures such a doped conjugated polymer fiber can be considered as an array of small conducting regions separated by nanoscale barriers, where the Coulomb blockade tunneling is the dominant transport mechanism.PACS numbers: 71.30.+h, 72.20.Ee, 72.80.Le Complex structures built of nanosize conducting objects provide model systems for investigation of transport phenomena on the mesoscopic scale, where quantum confinement and Coulomb charging play an important role [1]. Electronic transport through an array of metallic nanocrystals separated by nanobarriers is determined by the interplay between single-electron charging of an individual conducting region and tunneling between adjacent islands. In such systems both the tunneling resistance between neighboring regions is large, R T >> h/e 2 and the charging energy E C = e 2 /2C of an excess electron on a site is larger than k B T (C is the capacitance of the region). In the presence of both charge and structural disorder this interplay leads to highly nonOhmic current-voltage (I-V) characteristics. Coulomb blockade theory predicts that at low temperatures, there is no current below a specific threshold voltage, V t , while above V t the current follows a power law:with ζ ~ 1 in one dimensional (1D) and 5/3 or 2 in twodimensional (2D) systems [2]. V t depends on the nanocrystal number, the capacitance of the conducting regions and the capacitance between the each region and the back gate. Such a behavior with scaling exponents between 1 and 2.3 has been found, for example, in narrow chains of carbon nanoparticles [3], and in 100 nm wide multilayer of gold particles which exhibited ζ ~ 1.6 [4]. Coulomb-blockade effects have also been observed in multiwalled carbon nanotubes [5], organic thin-film transistors based on highly ordered molecular materials [6] as well as in single-molecular transistor structures [7]. It is evident that the nature of the individual regions: metallic, semiconducting, quantum dots -is irrelevant for this phenomenon to be observed [8]. In view of these results the question arises whether Coulomb-blockade effects can also be observed in such inherent quasi-1D systems as conducting polymer nanofibers. In this connection polyacetylene (PA) nanofibers are of particular interest as the model system for nanotransport studies because of the simple chemical structure, well defined polycrystallinity [9], and good ability for doping [10][11][12]. It is...

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confidence: 99%

Coulomb-blockade transport in quasi-one-dimensional polymer nanofibers

et al. 2005

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“…The observed I-V characteristics of PDA films are different from that of conventional semiconductor FETs [8] or organic FETs [9,10], that show saturation behavior. We note that similar temperature and gate-voltage dependent, superlinear I-V characteristics were observed in carbon nanotube and polyacetylene nanofiber FETs [11,12]. By analogy with polyacetylene nanofiber [12] we can consider the relatively low voltage region in the I-V characteristics in terms of the linear region in conventional MOSFETs, then from the transconductance, g m , we can estimate the field-effect mobility [8]:…”

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Non-Ohmic conduction in polydiacetylene thin films

Алешин

Chu

Козуб

et al. 2005

Current Applied Physics

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“…They have relatively high conductivity, are light in weight, inexpensive to synthesise, flexible, air-stable, etc., which make them promising for commercial applications [1]. They have been used in organic light emitting diodes [2], organic field effect transistors [3], electromagnetic interference shielding [4], anti-static coatings [5], and capacitors [6].…”

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confidence: 99%

Concentration-dependent growth and morphology of doped polyaniline nanowires

Nair

Rajeswari

Natarajan

et al. 2013

Journal of Experimental Nanoscience

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Polyaniline nanowires with entangled network structures were synthesised through an electropolymerisation route using a step galvanostatic method on titanium substrate. The morphology of the synthesised polyaniline was investigated by scanning electron microscopy and transmission electron microscopy. The dependence of morphology on the concentration and duration of synthesis has also been studied. Structural characterisation has been done by UV-VIS spectroscopy and Fourier transform infrared spectroscopy. The concentration of the monomer and the duration of synthesis affect the morphology as well as the amount of nanowires deposited.

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Quantum transport in low-dimensional organic nanostructures

Cited by 25 publications

References 25 publications

Coulomb-blockade transport in quasi-one-dimensional polymer nanofibers

Coulomb-blockade transport in quasi-one-dimensional polymer nanofibers

Non-Ohmic conduction in polydiacetylene thin films

Concentration-dependent growth and morphology of doped polyaniline nanowires

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