scholarly journals Flexible N-Type Thermoelectric Composites Based on Non-Conductive Polymer with Innovative Bi2Se3-CNT Hybrid Nanostructured Filler

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4264
Author(s):  
Juris Bitenieks ◽  
Krisjanis Buks ◽  
Remo Merijs-Meri ◽  
Jana Andzane ◽  
Tatjana Ivanova ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Physical Vapor Deposition ◽  
Coefficient Of Thermal Expansion ◽  
Electrical Contact ◽  
Conductive Polymer ◽  
Multiwalled Carbon ◽  
Linear Coefficient ◽  
Physical Vapor Deposition Method ◽  
Mechanical Durability ◽  
Flexible Thermoelectric

This research is devoted to the fabrication of polyvinyl alcohol (PVOH) based n-type thermoelectric composites with innovative hybrid bismuth selenide-multiwalled carbon nanotube (Bi2Se3-MWCNT) fillers for application in flexible thermoelectric devices. Hybrid fillers were synthesized by direct deposition of Bi2Se3 on multiwalled carbon nanotubes using a physical vapor deposition method, thus ensuring direct electrical contact between the carbon nanotubes and Bi2Se3. The Seebeck coefficient of prepared PVOH/Bi2Se3-MWCNT composites was found to be comparable with that for the Bi2Se3 thin films, reaching −100 µV·K−1 for the composite with 30 wt.% filler, and fluctuations of the resistance of these composites did not exceed 1% during 100 repetitive bending cycles down to 10 mm radius, indicating the good mechanical durability of these composites and proving their high potential for application in flexible thermoelectrics. In addition, other properties of the fabricated composites that are important for the use of polymer-based materials such as thermal stability, storage modulus and linear coefficient of thermal expansion were found to be improved in comparison with the neat PVOH.

Solution-processable flexible thermoelectric composite films based on conductive polymer/SnSe0.8S0.2 nanosheets/carbon nanotubes for wearable electronic applications

2018 ◽  
Vol 6 (14) ◽  
pp. 5627-5634 ◽  
Author(s):  
Hyun Ju ◽  
Dabin Park ◽  
Jooheon Kim
Keyword(s):  
Carbon Nanotubes ◽  
Thermoelectric Power ◽  
Power Factor ◽  
Composite Films ◽  
Conductive Polymer ◽  
Solution Processing ◽  
Thermoelectric Power Factor ◽  
Processing Procedure ◽  
Wearable Electronic ◽  
Flexible Thermoelectric

Flexible thermoelectric composite films with a high thermoelectric power factor are achieved via a solution processing procedure.

Additive Manufacturing of Conductive Polymer Nanocomposites Under the Influence of External Magnetic Field

2016 ◽  
Author(s):  
Kiran Babu Koyalamudi ◽  
Ruoyu Yang ◽  
Rahul Rai
Keyword(s):  
Magnetic Field ◽  
Carbon Nanotubes ◽  
Additive Manufacturing ◽  
External Magnetic Field ◽  
Polymer Nanocomposites ◽  
Multiwalled Carbon Nanotubes ◽  
Polymer Matrix ◽  
Conductive Polymer ◽  
Multiwalled Carbon ◽  
Preferential Alignment

Conductive polymer nanocomposites (CPNCs) have gained a lot of attention by the researchers, in recent times, due to their diverse technological applications in different domains. This paper discusses the additive manufacturing of conductive polymer nanocomposite. Maghemite-Multiwalled carbon nanotubes were synthesized, and later dispersed in an acrylate resin, followed by curing with UV DLP 3D printer, under the presence of external magnetic field. Maghemite-Multiwalled carbon nanotubes showed superior magnetic properties, when compared to Multiwalled carbon nanotubes and lead to improvements in preferential alignment of filler material in the polymer matrix. The initial experimental results show preferential alignment of Maghemite-Multiwalled carbon nanotubes in the polymer matrix under the influence of external uniform magnetic field, at an intensity of 120 Gauss.

Soldering of Carbon Nanotube Bridges using Electron Beam Deposited Gold

2003 ◽  
Vol 772 ◽  
Author(s):  
Søren Dohn ◽  
Kristian Mølhave ◽  
Dorte Nørgaard Madsen ◽  
Ramona Mateiu ◽  
Peter Bøggild ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electron Beam ◽  
Carbon Nanotube ◽  
Electrical Contact ◽  
Chemical Vapour ◽  
Pure Gold ◽  
Ambient Conditions ◽  
Multiwalled Carbon ◽  
Silicon Chips ◽  
Carbon Molecules

AbstractWe have formed suspended bridges of carbon nanotubes between microcantilevers using electron beam dissociation of metal-organic vapours. By electron beam exposure of a surface in the presence of gold-carbon molecules emitted inside an environmental scanning electron microscope, we are able to form tips and other freestanding nanostructures of high metallic content. Suspended bridges made entirely of this material exhibit resistances less than 50 times that of pure gold, and consist of dense metallic cores surrounded by a crust of nanoparticles. We used standard microfabrication techniques to produce silicon chips with multiple microcantilevers extending over the edge. Individual multiwalled carbon nanotubes grown catalyticcally by chemical vapour deposition, were positioned across two cantilevers using in-situ nanomanipulation tools. Drawing a cross-shaped gold-carbon bond on each end of the carbon nanotube consistently resulted in electrical contact with resistances in the range 1-90 Ω and linear current-voltage characteristics. We found that soldering bonds having a line width down to 10-15 nm form connections and last for days in ambient conditions.

A simple, reliable technique for making electrical contact to multiwalled carbon nanotubes

1999 ◽  
Vol 74 (2) ◽  
pp. 323-325 ◽  
Author(s):  
P. J. de Pablo ◽  
E. Graugnard ◽  
B. Walsh ◽  
R. P. Andres ◽  
S. Datta ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Electrical Contact ◽  
Multiwalled Carbon ◽  
Reliable Technique

scholarly journals Effect of Acid- and Ultraviolet/Ozonolysis-Treated MWCNTs on the Electrical and Mechanical Properties of Epoxy Nanocomposites as Bipolar Plate Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Nishata Royan Rajendran Royan ◽  
Abu Bakar Sulong ◽  
Jaafar Sahari ◽  
Hendra Suherman
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Conductive Polymer ◽  
Bipolar Plate ◽  
Department Of Energy ◽  
Multiwalled Carbon ◽  
The Us ◽  
Electrical Conductivities ◽  
Conductive Fillers

Carbon nanotubes (CNTs) have a huge potential as conductive fillers in conductive polymer composites (CPCs), particularly for bipolar plate applications. These composites are prepared using singlefiller and multifiller reinforced multiwalled carbon nanotubes (MWCNTs) that have undergone a chemical functionalization process. The electrical conductivity and mechanical properties of these composites are determined and compared between the different functionalization processes. The results show that UV/O3-treated functionalization is capable of introducing carboxylic functional groups on CNTs. Acid-treated CNT composites give low electrical conductivity, compared with UV/O3-treated and As-produced CNTs. The in- and through-plane electrical conductivities and flexural strength of multifiller EP/G/MWCNTs (As-produced and UV/O3-treated) achieved the US Department of Energy targets. Acid-treated CNT composites affect the electrical conductivity and mechanical properties of the nanocomposites. These data indicate that the nanocomposites developed in this work may be alternative attributers of bipolar plate requirements.

scholarly journals On the Use of Carbon Cables from Plastic Solvent Combinations of Polystyrene and Toluene in Carbon Nanotube Synthesis

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 9
Author(s):  
Alvin Orbaek White ◽  
Ali Hedayati ◽  
Tim Yick ◽  
Varun Shenoy Gangoli ◽  
Yubiao Niu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Copper Wire ◽  
Electrical Contact ◽  
Chemical Vapour ◽  
Electrical Contact Resistance ◽  
Multiwalled Carbon ◽  
Percentage Yield ◽  
D Values ◽  
Carbon Nanotube Synthesis

For every three people on the planet, there are approximately two Tonnes (Te) of plastic waste. We show that carbon recovery from polystyrene (PS) plastic is enhanced by the coaddition of solvents to grow carbon nanotubes (CNTs) by liquid injection chemical vapour deposition. Polystyrene was loaded up to 4 wt% in toluene and heated to 780 °C in the presence of a ferrocene catalyst and a hydrogen/argon carrier gas at a 1:19 ratio. High resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and Raman spectroscopy were used to identify multiwalled carbon nanotubes (MWCNTs). The PS addition in the range from 0 to 4 wt% showed improved quality and CNT homogeneity; Raman “Graphitic/Defective” (G/D) values increased from 1.9 to 2.3; mean CNT diameters increased from 43.0 to 49.2 nm; and maximum CNT yield increased from 11.37% to 14.31%. Since both the CNT diameters and the percentage yield increased following the addition of polystyrene, we conclude that carbon from PS contributes to the carbon within the MWCNTs. The electrical contact resistance of acid-washed Bucky papers produced from each loading ranged from 2.2 to 4.4 Ohm, with no direct correlation to PS loading. Due to this narrow range, materials with different loadings were mixed to create the six wires of an Ethernet cable and tested using iPerf3; the cable achieved up- and down- link speeds of ~99.5 Mbps, i.e., comparable to Cu wire with the same dimensions (~99.5 Mbps). The lifecycle assessment (LCA) of CNT wire production was compared to copper wire production for a use case in a Boeing 747-400 over the lifespan of the aircraft. Due to their lightweight nature, the CNT wires decreased the CO2 footprint by 21 kTonnes (kTe) over the aircraft’s lifespan.

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