scholarly journals Three-Dimensional (3D) Conductive Network of CNT-Modified Short Jute Fiber-Reinforced Natural Rubber: Hierarchical CNT-Enabled Thermoelectric and Electrically Conductive Composite Interfaces

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2668 ◽  
Author(s):  
Lazaros Tzounis ◽  
Markos Petousis ◽  
Marco Liebscher ◽  
Sotirios Grammatikos ◽  
Nectarios Vidakis
Keyword(s):  
Electrical Conductivity ◽  
Natural Rubber ◽  
Thermoelectric Properties ◽  
Electrical Response ◽  
Three Dimensional ◽  
Multiwall Carbon Nanotubes ◽  
Sem Analysis ◽  
Conductive Atomic Force Microscopy ◽  
Electrically Conductive ◽  
Thermoelectric Measurements

Jute fibers (JFs) coated with multiwall carbon nanotubes (MWCNTs) have been introduced in a natural rubber (NR) matrix creating a three-dimensional (3D) electrically conductive percolated network. The JF-CNT endowed electrical conductivity and thermoelectric properties to the final composites. CNT networks fully covered the fiber surfaces as shown by the corresponding scanning electron microscopy (SEM) analysis. NR/JF-CNT composites, at 10, 20 and 30 phr (parts per hundred gram of rubber) have been manufactured using a two-roll mixing process. The highest value of electrical conductivity (σ) was 81 S/m for the 30 phr composite. Thermoelectric measurements revealed slight differences in the Seebeck coefficient (S), while the highest power factor (PF) was 1.80 × 10−2 μW/m K−2 for the 30 phr loading. The micromechanical properties and electrical response of the composite’s conductive interface have been studied in peak force tapping quantitative nanomechanical (PFT QNM) and conductive atomic force microscopy (c-AFM) mode. The JF-CNT create an electrically percolated network at all fiber loadings endowing electrical and thermoelectric properties to the NR matrix, considered thus as promising thermoelectric stretchable materials.

scholarly journals MWCNT/rGO/natural rubber latex dispersions for innovative, piezo-resistive and cement-based composite sensors

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
L. Verdolotti ◽  
C. Santillo ◽  
G. Rollo ◽  
G. Romanelli ◽  
M. Lavorgna ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Inelastic Neutron Scattering ◽  
Three Dimensional ◽  
Natural Rubber Latex ◽  
Multiwall Carbon Nanotubes ◽  
Aqueous Dispersion ◽  
Inelastic Neutron ◽  
X Ray Diffraction ◽  
Rubber Latex ◽  
Latex Dispersions

AbstractThe present study is focused on the development and characterization of innovative cementitious-based composite sensors. In particular, multifunctional cement mortars with enhanced piezoresistive properties are realized by exploiting the concept of confinement of Multiwall Carbon Nanotubes (MWCNTs) and reduced Graphene Oxide (rGO) in a three-dimensional percolated network through the use of a natural-rubber latex aqueous dispersion. The manufactured cement-based composites were characterized by means of Inelastic Neutron Scattering to assess the hydration reactions and the interactions between natural rubber and the hydrated-cement phases and by Scanning Electron Microscopy and X-Ray diffraction to evaluate the morphological and mineralogical structure, respectively. Piezo-resistive properties to assess electro-mechanical behavior in strain condition are also measured. The results show that the presence of natural rubber latex allows to obtain a three-dimensional rGO/MWCNTs segregate structure which catalyzes the formation of hydrated phases of the cement and increases the piezo-resistive sensitivity of mortar composites, representing a reliable approach in developing innovative mortar-based piezoresistive strain sensors.

scholarly journals High Electrical Conductivity in Three-Dimensional Porphyrin-Phosphonate Metal Organic-Frameworks

2021 ◽  
Author(s):  
Yunus Zorlu ◽  
Patrik Tholen ◽  
Mehmet Menaf Ayhan ◽  
Ceyda Bayraktar ◽  
Gabriel Hanna ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Low Cost ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
High Yield ◽  
Electrically Conductive ◽  
Design And Synthesis ◽  
Metal Organic ◽  
Indirect Band Gap ◽  
Organic Framework

<p>Herein, we report the design and synthesis of a highly electrically conductive and microporous three-dimensional zinc-phosphonate metal-organic framework [Zn(Cu-<i>p</i>-H<sub>4</sub>TPPA)] ⋅2 (CH<sub>3</sub>)<sub>2</sub>NH<sub>2</sub><sup>+</sup> (designated as GTUB3), constructed using the 5,10,15,20‐tetrakis [<i>p</i>‐phenylphosphonic acid] porphyrin (<i>p</i>-H<sub>8</sub>TPPA) organic linker. GTUB3 has an indirect band gap of 1.64 eV and a high average electrical conductivity of<b> </b>4 S/m, making it a rare example of an electrically conductive zinc metal-organic framework. The N<sub>2</sub>-accessible geometric surface area of GTUB3, as predicted by molecular simulations, is 671 m<sup>2</sup>/g. Owing to its simple, high-yield synthesis at low temperatures, porosity, and electrical conductivity, GTUB3 may be used as a low-cost electrode material in next generation phosphonate-supercapacitors. </p>

Thermal and Thermoelectric Measurements of Low Dimensional Nanostructures

2003 ◽  
Author(s):  
Choongho Yu ◽  
Wanyoung Jang ◽  
Tobias Hanrath ◽  
Dohyung Kim ◽  
Zhen Yao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermoelectric Properties ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Vapor ◽  
Single Wall Carbon Nanotubes ◽  
Thermoelectric Measurements ◽  
Improved Design ◽  
Sno2 Nanobelts ◽  
Low Dimensional

Low dimensional materials have unique thermal and thermoelectric properties that can be very different from their bulk counterparts. In a previous work, we and our collaborators have developed a microdevice for measuring thermal and thermoelectric properties of multiwall carbon nanotubes. Here, we used an improved design of the device for measuring single wall carbon nanotubes, Ge nanowires, and SnO2 nanobelts. These nanostructures are trapped between two adjacent symmetric silicon nitride membranes of the micro device using either a wet deposition method or in-situ chemical vapor deposition. The measurements provide the critically needed data of the unique thermophysical properties of these nanomaterials.

Flux Synthesis of New Multinary Bismuth Chalcogenides and their Thermoelectric Properties

1998 ◽  
Vol 545 ◽  
Author(s):  
Duck-Young Chung ◽  
Kyoung-Shin Choi ◽  
Paul W. Brazis ◽  
Carl R. Kannewurf ◽  
Mercouri G. Kanatzidis
Keyword(s):  
Thermal Stability ◽  
Electrical Conductivity ◽  
Thermoelectric Properties ◽  
Solid Solutions ◽  
Three Dimensional ◽  
Melting Behavior ◽  
Dimensional Structure ◽  
Three Dimensional Structure ◽  
Flux Synthesis ◽  
Bismuth Chalcogenides

AbstractWe present the synthesis and structure of the new chalcogenide compounds, Rb0.5Bi1.83Te3, APb2Bi3Te7 (A = Cs, Rb), K1.25Pb3.50Bi7.25Se15 and A1+xPb4−2xSb7+xSe15 (A = K, Rb). The layered structures of the first two telluride compounds are related to each other in a very interesting fashion. These compounds are n-type metallic conductors and solid solutions with Se and Sb have also been synthesized. K1.25Pb3.50Bi7.25Se15 and its Sb analogs have a complex three-dimensional structure composed of NaCl- and Bi2Te3-type building units. The thermal stability, melting behavior, electrical conductivity and thermopower of these compounds are reported.

scholarly journals High Electrical Conductivity in Three-Dimensional Porphyrin-Phosphonate Metal Organic-Frameworks

2021 ◽  
Author(s):  
Yunus Zorlu ◽  
Patrik Tholen ◽  
Mehmet Menaf Ayhan ◽  
Ceyda Bayraktar ◽  
Gabriel Hanna ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Low Cost ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
High Yield ◽  
Electrically Conductive ◽  
Design And Synthesis ◽  
Metal Organic ◽  
Indirect Band Gap ◽  
Organic Framework

<p>Herein, we report the design and synthesis of a highly electrically conductive and microporous three-dimensional zinc-phosphonate metal-organic framework [Zn(Cu-<i>p</i>-H<sub>4</sub>TPPA)] ⋅2 (CH<sub>3</sub>)<sub>2</sub>NH<sub>2</sub><sup>+</sup> (designated as GTUB3), constructed using the 5,10,15,20‐tetrakis [<i>p</i>‐phenylphosphonic acid] porphyrin (<i>p</i>-H<sub>8</sub>TPPA) organic linker. GTUB3 has an indirect band gap of 1.64 eV and a high average electrical conductivity of<b> </b>4 S/m, making it a rare example of an electrically conductive zinc metal-organic framework. The N<sub>2</sub>-accessible geometric surface area of GTUB3, as predicted by molecular simulations, is 671 m<sup>2</sup>/g. Owing to its simple, high-yield synthesis at low temperatures, porosity, and electrical conductivity, GTUB3 may be used as a low-cost electrode material in next generation phosphonate-supercapacitors. </p>

Structure and Thermoelectric Properties of New Quaternary Tin and Lead Bismuth Selenides, K1+xM4-2xBi7+xSe15 (M = Sn, Pb) and K1+xSn5-xBi11+xSe22

2000 ◽  
Vol 626 ◽  
Author(s):  
Antje Mrotzek ◽  
Kyoung-Shin Choi ◽  
Duck-Young Chung ◽  
Melissa A. Lane ◽  
John R. Ireland ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Single Crystal ◽  
Thermoelectric Properties ◽  
Three Dimensional ◽  
Structure Type ◽  
Narrow Gap ◽  
Low Thermal Conductivity ◽  
Seebeck Coefficients ◽  
Metal Atoms ◽  
Anionic Framework

ABSTRACTWe present the structure and thermoelectric properties of the new quaternary selenides K1+xM4–2xBi7+xSe15 (M = Sn, Pb) and K1-xSn5-xBi11+xSe22. The compounds K1+xM4-2xBi7+xSe15 (M= Sn, Pb) crystallize isostructural to A1+xPb4-2xSb7+xSe15 with A = K, Rb, while K1-xSn5-xBi11+xSe22 reveals a new structure type. In both structure types fragments of the Bi2Te3-type and the NaCl-type are connected to a three-dimensional anionic framework with K+ ions filled tunnels. The two structures vary by the size of the NaCl-type rods and are closely related to β-K2Bi8Se13 and K2.5Bi8.5Se14. The thermoelectric properties of K1+xM4-2xBi7+xSe15 (M = Sn, Pb) and K1-xSn5-xBi11+xSe22 were explored on single crystal and ingot samples. These compounds are narrow gap semiconductors and show n-type behavior with moderate Seebeck coefficients. They have very low thermal conductivity due to an extensive disorder of the metal atoms and possible “rattling” K+ ions.

Polypyrrole/PU hybrid hydrogels: electrically conductive and fast self-healing for the potential application in body-monitor sensor

2021 ◽  
Author(s):  
Zhanyu Jia ◽  
Guangyao Li ◽  
Juan Wang ◽  
shouhua Su ◽  
Jie Wen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Potential Application ◽  
Self Healing ◽  
Electrically Conductive ◽  
Sensor Application ◽  
Hybrid Hydrogels ◽  
Health Monitor

Conductivity, self-healing and moderate mechanical properties are necessary for multifunctional hydrogels which have great potential in health-monitor sensor application. However, the combination of electrical conductivity, self-healing and good mechanical properties...

scholarly journals Electrically Conductive Networks from Hybrids of Carbon Nanotubes and Graphene Created by Laser Radiation

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1875
Author(s):  
Alexander Yu. Gerasimenko ◽  
Artem V. Kuksin ◽  
Yury P. Shaman ◽  
Evgeny P. Kitsyuk ◽  
Yulia O. Fedorova ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Laser Irradiation ◽  
Flexible Electronics ◽  
Threshold Energy ◽  
Wavelength Region ◽  
Hybrid Nanostructures ◽  
Graphene Sheets ◽  
Electrically Conductive ◽  
Walled Carbon Nanotubes

A technology for the formation of electrically conductive nanostructures from single-walled carbon nanotubes (SWCNT), multi-walled carbon nanotubes (MWCNT), and their hybrids with reduced graphene oxide (rGO) on Si substrate has been developed. Under the action of single pulses of laser irradiation, nanowelding of SWCNT and MWCNT nanotubes with graphene sheets was obtained. Dependences of electromagnetic wave absorption by films of short and long nanotubes with subnanometer and nanometer diameters on wavelength are calculated. It was determined from dependences that absorption maxima of various types of nanotubes are in the wavelength region of about 266 nm. It was found that contact between nanotube and graphene was formed in time up to 400 fs. Formation of networks of SWCNT/MWCNT and their hybrids with rGO at threshold energy densities of 0.3/0.5 J/cm2 is shown. With an increase in energy density above the threshold value, formation of amorphous carbon nanoinclusions on the surface of nanotubes was demonstrated. For all films, except the MWCNT film, an increase in defectiveness after laser irradiation was obtained, which is associated with appearance of C–C bonds with neighboring nanotubes or graphene sheets. CNTs played the role of bridges connecting graphene sheets. Laser-synthesized hybrid nanostructures demonstrated the highest hardness compared to pure nanotubes. Maximum hardness (52.7 GPa) was obtained for MWCNT/rGO topology. Regularity of an increase in electrical conductivity of nanostructures after laser irradiation has been established for films made of all nanomaterials. Hybrid structures of nanotubes and graphene sheets have the highest electrical conductivity compared to networks of pure nanotubes. Maximum electrical conductivity was obtained for MWCNT/rGO hybrid structure (~22.6 kS/m). Networks of nanotubes and CNT/rGO hybrids can be used to form strong electrically conductive interconnections in nanoelectronics, as well as to create components for flexible electronics and bioelectronics, including intelligent wearable devices (IWDs).

scholarly journals Multi-material braids for multifunctional laminates: conductive through-thickness reinforcement

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Caroline O’Keeffe ◽  
Laura Rhian Pickard ◽  
Juan Cao ◽  
Giuliano Allegri ◽  
Ivana K. Partridge ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Carbon Fibre ◽  
Electromagnetic Interference ◽  
Design Tool ◽  
Electrically Conductive ◽  
Current Collection ◽  
Wide Range ◽  
Predictive Design ◽  
The Right ◽  
Metal Wires

AbstractConventional carbon fibre laminates are known to be moderately electrically conductive in-plane, but have a poor through-thickness conductivity. This poses a problem for functionality aspects that are of increasing importance to industry, such as sensing, current collection, inductive/resistive heating, electromagnetic interference (EMI) shielding, etc. This restriction is of course more pronounced for non-conductive composite reinforcements such as glass, organic or natural fibres. Among various solutions to boost through-thickness electrical conductivity, tufting with hybrid micro-braided metal-carbon fibre yarns is one of the most promising. As a well-characterised method of through thickness reinforcement, tufting is easily implementable in a manufacturing environment. The hybridisation of materials in the braid promotes the resilience and integrity of yarns, while integrating metal wires opens up a wide range of multifunctional applications. Many configurations can be produced by varying braid patterns and the constituting yarns/wires. A predictive design tool is therefore necessary to select the right material configuration for the desired functional and structural performance. This paper suggests a fast and robust method for generating finite-element models of the braids, validates the prediction of micro-architecture and electrical conductivity, and demonstrates successful manufacturing of composites enhanced with braided tufts.

Sign in / Sign up

Export Citation Format

Share Document