A Review on Electronic Transport Properties of Individual Conducting Polymer Nanotubes and Nanowires

Long, Yun‐Ze; Chen, Zhaojia; Gu, Changzhi; Wan, Meixiang; Duvail, Jean‐Luc; Liu, Zongwen; Ringer, Simon P.

doi:10.5772/39488

Cited by 10 publications

(8 citation statements)

References 87 publications

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“…This makes it possible to neglect the contribution of such contacts to ohmic conductivity at low applied voltage or pressure. It was shown [36] that for such contacts the following conductivity mechanisms were possible: space-charge limited current, fluctuation-induced tunneling [37,38], Coulomb gap [39][40][41], Coulomb blockade [42][43][44] and others. For such mechanisms there is a critical value of E cr correlating with the potential barrier between the contacts.…”

Section: Conductivity Of the Compositesmentioning

confidence: 99%

Effect of ultrasonic treatment on the properties of multiwalled carbon nanotubes – polymethylmethacrylate composites: Effect of applied voltage and pressure on conductivity of the composites

Мосеенков¹,

Kuznetsov²,

Zavorin³

et al. 2019

Express Polym. Lett.

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The effect of sonication time during the synthesis of multiwalled carbon nanotubes-polymethylmethacrylate (MWCNT/PMMA) composites by coagulation technique on the MWCNT distribution in the bulk of the composites close to the percolation threshold was systematically studied by SEM and by measurements on specific resistivity in a wide range of voltages and external pressure. It was found that the resistivity of composites is irreversibly reduced up to 10 5 times during the first 1-3 measurements, while further measurements are characterized by high repeatability. Change of the composite resistivity during the measurements is discussed assuming that several types of contacts between the nanotubes changing during the measurement are present. It was found that an increase of the sonication time changed the ratio between ohmic and non-ohmic contacts. It affected the type of changes in the sample resistivity during the voltage variation in the range of 0-10 3 V/mm and resulted in a nonuniform dependence of the composite specific resistivity on the sonication time. An increase of the composite volume during the resistivity measurements was observed at the current densities above 4•10-8 A/cm 2. New ohmic contacts were found to form when external pressure was applied due to squeezing of the polymer matrix from the space between adjacent nanotubes.

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Section: Conductivity Of the Compositesmentioning

confidence: 99%

Effect of ultrasonic treatment on the properties of multiwalled carbon nanotubes – polymethylmethacrylate composites: Effect of applied voltage and pressure on conductivity of the composites

Мосеенков¹,

Kuznetsov²,

Zavorin³

et al. 2019

Express Polym. Lett.

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“…The resistance of the contact is inversely proportional to its area and is independent on the surface stiffness, force holding the two surfaces together. [14].…”

Section: D-dielectric Measurementmentioning

confidence: 99%

Electrical Dielectric Authorship of Polyvinyl-Acetate and Toluene Diisocyanate (PVA-TDI) with Manufactured Sulfonated Phenol-formaldehyde (SPF) Viscous Mass Material Composite

Journal¹

2017

Baghdad Sci.J

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The electrical insulation of the manufacture sulfonated phenol-formaldehyde viscous material (product) has been studied with Polyvinyl-acetate (PVA) and toluene diisocyanate (TDI) blend has been prepared by fixing percentage by weight 3:1 and mixed with different percentages by weight of the product sulfonated phenol formaldehyde viscous mass (SPF). The Fourier transform infrared (FTIR) spectroscopy is done on (SPF) resin powder and prepared film of PVA-TDI-SPF viscous mass. The quality factor (Q), dissipation factor (D), parallel resistance (Rp), series resistance (Rs), parallel capacitance (Cp), series capacitance (Cs) and phase shift (?) are measured. The calculated maximum dielectric constant (??) is 3.49x107 at sample (1) wt.1% SPF viscous mass to the weight of (PVA-TDI), the minimum dielectric constant is 1.12x106 at sample (3) wt.3% of SPF viscous mass to PVA-TDI weight. The maximum dielectric loss factor (??) is 3.68x107 at sample (1) and the minimum dielectric loss is 2.04x106 for sample (3). The maximum conductance is 1.06x10-4 S at sample (1) and minimum conductance is 6.64x10-6 at sample (3). The maximum frequency dependent ac. conductivity (?ac) is 2.048 S m-1 for sample (1) and the minimum is 0.113 S m-1 at sample (3). The maximum total conductivity (?t) is 126.2 S m-1 for sample (1) and minimum (?t) is 1.129 S m-1 for sample (3). The maximum independent conductivity (?dc) is 124 S m-1 for sample (1) and minimum value is 1.015 S m-1 for sample (3). The maximum capacitive reactance (Xs) is 0.83 M? at sample (5) wt.5% SPF viscous mass to PVA-TDI weight and the minimum is 0.14 M? for sample (3).

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“…] in only one direction rather than between the chains. A controlled nanoarchitecture in a porous material can, therefore, be more conductive than an amorphous or bulk structure in which d is not well controlled or contact is localized [28,29] . Indeed, it has been shown that CNTs will show more contact points if they were wavy compared to straight tubes.…”

Section: Conductive Propertiesmentioning

confidence: 99%

“…If the material was fabricated to be nanowires, the width and height becomes negligible ( N width = N height = 1) in relation to the length ( N length > > N width = N height ), then, the conductivity is possible in only one direction or anisotropic ( σ total ∼ σ length ). By decreasing the radius, the conductivity for single PPy or PANI nanotubes at a given length increases severalfold due to optimal alignment of the conductors in one direction [19,28] . The insulation of the nanowires by increasing the perpendicular separation distance ( d ) between the chains can ensure that the conduction through several conducting chains is possible .…”

Section: Conductive Propertiesmentioning

confidence: 99%

“…The release rate from the spherical particles with a radius of smaller than 1 mm were studied and pointed out that the interfacial transfer kinetics becomes rate-limiting (analogous to the dissolution arguments) [183] . Short time periods are described by Equation (28) and long time periods by Equation (29):…”

Section: Drug Release From Homogeneous and Granular Matricesmentioning

confidence: 99%

See 1 more Smart Citation

Why is the nanoscale special (or not)? Fundamental properties and how it relates to the design of nano-enabled drug delivery systems

Otto

Villiers

2013

Nanotechnology Reviews

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Why is the nanoscale special (or not) ?Fundamental properties and how it relates to the design of nano-enabled drug delivery systems Abstract: Nanoscience studies describe natural phenomena at the submicron scale. Below a critical nanoscale limit, the physical, chemical, and biological properties of materials show a marked departure in their behavior compared to the bulk. At the nanoscale, energy conversion is dominated by phonons, whereas at larger scales, electrons determine the process. The surface-to-volume ratio at the nanoscale is immense, and interfacial interactions are markedly more important than at the macroscopic level, where the majority of the material is shielded from the surface. These properties render the nanoparticles to be significantly different from their larger counterparts. Nano-enabled drug delivery systems have resulted from multidisciplinary cooperation aimed at improving drug delivery. Significant improvements in the thermodynamic and delivery properties are seen due to nanotechnology. Hybrid nanodelivery systems, i.e., membranes with nanopores that can gate stimuli-responsive drug release could be a future development. Nanotechnology will improve current drug delivery and create novel future delivery systems. The fundamental properties and challenges of nanodelivery systems are discussed in this review.

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A Review on Electronic Transport Properties of Individual Conducting Polymer Nanotubes and Nanowires

Cited by 10 publications

References 87 publications

Effect of ultrasonic treatment on the properties of multiwalled carbon nanotubes – polymethylmethacrylate composites: Effect of applied voltage and pressure on conductivity of the composites

Effect of ultrasonic treatment on the properties of multiwalled carbon nanotubes – polymethylmethacrylate composites: Effect of applied voltage and pressure on conductivity of the composites

Electrical Dielectric Authorship of Polyvinyl-Acetate and Toluene Diisocyanate (PVA-TDI) with Manufactured Sulfonated Phenol-formaldehyde (SPF) Viscous Mass Material Composite

Why is the nanoscale special (or not)? Fundamental properties and how it relates to the design of nano-enabled drug delivery systems

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