Carbon nanotube yarns as strong flexible conductive capacitive electrodes

Liu, F.; Wagterveld, R.M.; Gebben, B.; Otto, M.; Biesheuvel, P.M.; Hamelers, H.V.M.

doi:10.1016/j.colcom.2015.02.001

Cited by 32 publications

(27 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At extremely low salt concentration, when the electric potential becomes uniform across the pore, and surface ionization is low, we derive the scaling G ∝ √ c, while for realistic salt concentrations, SC theory does not lead to a simple power law for G(c). DOI: 10.1103/PhysRevE.94.050601 The ionic conductance, G, of carbon nanotubes (CNTs) is of relevance for applications in membrane technology for water desalination, energy harvesting, and energy conversion [1][2][3][4][5][6]. Secchi et al [7,8] recently reported the first experimental results for G of single carbon nanotubes of different radii and lengths, in a large salt concentration range (1-1000 mM) and at several values of pH.…”

mentioning

confidence: 99%

Analysis of ionic conductance of carbon nanotubes

Biesheuvel¹,

Bazant

2016

Phys. Rev. E

116

View full text Add to dashboard Cite

We use space-charge (SC) theory (also called the capillary pore model) to describe the ionic conductance, G, of charged carbon nanotubes (CNTs). Based on the reversible adsorption of hydroxyl ions to CNT pore walls, we use a Langmuir isotherm for surface ionization and make calculations as a function of pore size, salt concentration c, and pH. Using realistic values for surface site density and pK, SC theory well describes published experimental data on the conductance of CNTs. At extremely low salt concentration, when the electric potential becomes uniform across the pore, and surface ionization is low, we derive the scaling G ∝ √ c, while for realistic salt concentrations, SC theory does not lead to a simple power law for G(c). DOI: 10.1103/PhysRevE.94.050601 The ionic conductance, G, of carbon nanotubes (CNTs) is of relevance for applications in membrane technology for water desalination, energy harvesting, and energy conversion [1][2][3][4][5][6]. Secchi et al. [7,8] recently reported the first experimental results for G of single carbon nanotubes of different radii and lengths, in a large salt concentration range (1-1000 mM) and at several values of pH. The observed dependence of G on pH, and the absence of a plateau in G at low salinity, were taken as evidence that CNTs acquire a surface charge by reversible adsorption of hydroxyl ions from water. A theoretical analysis led to a 1/3 power-law scaling of G with salt concentration, which is supported by the data.In the present work, to describe the same data of Secchi et al. [7,8], we use the general classical dilute solution theory for long and thin capillary pores, combining the extended Nernst-Planck equation with the Stokes equation for fluid flow and the Poisson-Boltzmann (PB) equation for the structure of the electrical double layer (EDL), evaluated in radial direction. This model was developed by Osterle and co-workers [9,10] and is known as the capillary pore model, or space charge (SC) theory. SC theory is based on ideal Boltzmann statistics of ions as point charges, and assumes validity of the equilibrium PB equation in the radial, r, direction [11][12][13][14][15][16][17]. SC theory also includes an axial salt concentration gradient, but this effect is neglected in the present analysis. Secchi et al. [7,8] use SC theory with several simplifications to arrive at an analytical expression for G versus pore size and salt concentration. For CNTs they introduce the key idea that the surface charge depends on pH (in the external bath) and surface potential, via a model for the reversible adsorption of hydroxyl ions.The structure of this report is as follows. We present the SC theory for the conductance G and show model simplifications when the Donnan approach, or uniform potential model [16][17][18][19] is used, valid for highly overlapped EDLs. We derive a scaling law of G with salt concentration in the low-salinity limit. We assess the assumptions made in the derivation of the analytical solution of Secchi et al. Finally we combine the full SC theor...

show abstract

mentioning

confidence: 99%

Analysis of ionic conductance of carbon nanotubes

Biesheuvel¹,

Bazant

2016

Phys. Rev. E

116

View full text Add to dashboard Cite

show abstract

“…Their electrical and mechanical properties remain even if they are knotted [34,35]. Additionally, they are highly porous and their specific surface area may range from tens to hundreds of m 2 /g [22,31,32,36,37]. The unique properties of these materials may be applied in electronics in a number of ways.…”

Section: Spun Cnt Fibers and Filmsmentioning

confidence: 99%

“…Post-process drawing, mechanical pressing or acetone condensation may be used to improve electrical and mechanical properties [34,44,45]. This treatment can, at the same time, decrease the specific surface area/porosity [22,31,32]. Another example of this post-manufacture processing is purification and doping of fibers/films, e.g., by annealing and acid/halogen infiltration [46][47][48][49][50].…”

Section: Use Of As-made Cnt Fibers and Filmsmentioning

confidence: 99%

“…Additionally, the spun fibers and films are characterized by a high thermal conductivity coupled with mechanical strength, fatigue resistance, specific surface area/porosity and flexibility. Thanks to these properties they show considerable promise as materials for smart textiles, antennas, sensors, capacitors, batteries and many more applications [26][27][28][29][30][31][32]. However, whether they are able to replace printed electronic components in all applications is the key question.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spun Carbon Nanotube Fibres and Films as an Alternative to Printed Electronic Components

et al. 2020

View full text Add to dashboard Cite

Current studies of carbon nanotubes have enabled both new electronic applications and improvements to the performance of existing ones. Manufacturing of macroscopic electronic components with this material generally involves the use of printed electronic methods, which must use carbon nanotube (CNT) powders. However, in recent years, it has been shown that the use of ready-made self-standing macroscopic CNT assemblies could have considerable potential in the future development of electronic components. Two examples of these are spun carbon nanotube fibers and CNT films. The following paper considers whether these spun materials may replace printed electronic CNT elements in all applications. To enable the investigation of this question some practical experiments were undertaken. They included the formation of smart textile elements, flexible and transparent components, and structural electronic devices. By taking this approach it has been possible to show that CNT fibres and films are highly versatile materials that may improve the electrical and mechanical performance of many currently produced printed electronic elements. Additionally, the use of these spun materials may enable many new applications and functionalities particularly in the area of e-textiles. However, as with every new technology, it has its limitations, and these are also considered.

show abstract

“…Additionally, there is no much attention to the use of natural fibers in such application. However, there are several studies on developing conductive coating using nanomaterials such as graphene [9], carbon nanotubes (CNT) [10,11], nickel, indium dioxide [12] and carbon black [13], but their coating methods were expensive and complex.…”

Section: Introductionmentioning

confidence: 99%

Mechanical characterization of functional graphene nanoplatelets coated natural and synthetic fiber yarns using polymeric binders

Mohan

Bhattacharyya

2020

International Journal of Smart and Nano Materials

View full text Add to dashboard Cite

Fabrication of electrically conductive yarns (glass, flax and polypropylene fibers) coated with graphene nanoparticles (GNP) were characterized for their mechanical properties and compared with their electrical properties. The composites were produced with the use of polymeric binders (epoxy resin and thermoplastic starch) and two different dipcoating methodologies were developed to create the coating layers. Technique-1 involved coating of binder and then GNP layer whereas Technique-2 had a mixture of binder and GNP in the predetermined ratio, which was coated on the yarns. The mechanism of adhesion varies or influences on a number of factors such as the nature of the fiber surface, coating method and effective binder. Tensile properties of the yarns were measured by an appropriate standard, and the highest tensile strength was noticed with epoxy-based glass fiber samples as 222 MPa followed by flax fiber samples as 206 MPa. The composites of starch-based showed poor mechanical performance compared to those of epoxy ones. This was due to poor adhesion between the surface and starch layer (interphase) where the Van der Wall's force was quite low. Electrical conductivity, glass fiber yarns with epoxy binder were identified to have the highest electrical conductivity of 0.1 S.cm −1 among other samples. ARTICLE HISTORY

show abstract

Carbon nanotube yarns as strong flexible conductive capacitive electrodes

Cited by 32 publications

References 23 publications

Analysis of ionic conductance of carbon nanotubes

Analysis of ionic conductance of carbon nanotubes

Spun Carbon Nanotube Fibres and Films as an Alternative to Printed Electronic Components

Mechanical characterization of functional graphene nanoplatelets coated natural and synthetic fiber yarns using polymeric binders

Contact Info

Product

Resources

About