scholarly journals Comparison of Piezo Resistive Property of Graphene based Polymer Films and Carbon Nanotube based Polymer Films to Optimize the Conductivity

2021 ◽  
Vol 11 (2) ◽  
pp. 1324-1338
Author(s):  
Paipalem Manoj Kumar
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Solid State ◽  
Polymer Films ◽  
Bridge Circuit ◽  
Wheatstone Bridge ◽  
Electronic Circuits ◽  
Hardware Interface ◽  
Resistive Property

Aim: The piezo resistive property of Graphene PVDF films and Carbon nanotube PVDF films is analyzed and the possibility of replacing solid state resistor (10 ohm) in electronic circuits is explored. Materials and Methods: Embedded hardware interface and Wheatstone bridge circuit is used to analyze the electrical conductivity of Graphene PVDF films (n=10) and Carbon nanotube PVDF films (n=10) of length 2.6 cm and width 1.1 cm. Results: Graphene PVDF films have significantly higher Conductivity (0.082 s/m) (p<0.05) than Carbon nanotube PVDF films (0.0108 s/m). Conclusion: Within the limits of this study Graphene PVDF films offer best Conductivity and can be used as a replacement for solid state resistors.

scholarly journals Influence of Carbon Nanotube-Pretreatment on the Properties of Polydimethylsiloxane/Carbon Nanotube-Nanocomposites

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1355
Author(s):  
Astrid Diekmann ◽  
Marvin C. V. Omelan ◽  
Ulrich Giese
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Mechanical Performance ◽  
Softening Effect ◽  
Electrical Percolation ◽  
Optimum Parameters ◽  
Lauryl Ether ◽  
Solvent Residues ◽  
Electrical Percolation Threshold ◽  
Filler Dispersion

Incorporating nanofillers into elastomers leads to composites with an enormous potential regarding their properties. Unfortunately, nanofillers tend to form agglomerates inhibiting adequate filler dispersion. Therefore, different carbon nanotube (CNT) pretreatment methods were analyzed in this study to enhance the filler dispersion in polydimethylsiloxane (PDMS)/CNT-composites. By pre-dispersing CNTs in solvents an increase in electrical conductivity could be observed within the sequence of tetrahydrofuran (THF) > acetone > chloroform. Optimization of the pre-dispersion step results in an AC conductivity of 3.2 × 10−4 S/cm at 1 Hz and 0.5 wt.% of CNTs and the electrical percolation threshold is decreased to 0.1 wt.% of CNTs. Optimum parameters imply the use of an ultrasonic finger for 60 min in THF. However, solvent residues cause a softening effect deteriorating the mechanical performance of these composites. Concerning the pretreatment of CNTs by physical functionalization, the use of surfactants (sodium dodecylbenzenesulfonate (SDBS) and polyoxyethylene lauryl ether (“Brij35”)) leads to no improvement, neither in electrical conductivity nor in mechanical properties. Chemical functionalization enhances the compatibility of PDMS and CNT but damages the carbon nanotubes due to the oxidation process so that the improvement in conductivity and reinforcement is superimposed by the CNT damage even for mild oxidation conditions.

Designing an Interlayer-Widened MoS2-Packed Nitrogen-Rich Carbon Nanotube Core–Shell Structure for Redox-Mediated Quasi-Solid-State Supercapacitors

2021 ◽  
Vol 4 (3) ◽  
pp. 2218-2230
Author(s):  
Sudhakaran Moopri Singer Pandiyarajan ◽  
Ganesh Kumar Veerasubramani ◽  
Roshan Mangal Bhattarai ◽  
Gnanaselvan Gnanasekaran ◽  
Sang Jae Kim ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Solid State ◽  
Shell Structure ◽  
Core Shell ◽  
Core Shell Structure

Dual percolations of electrical conductivity and electromagnetic interference shielding in progressively agglomerated CNT/polymer nanocomposites

2021 ◽  
pp. 108128652110214
Author(s):  
Xiaodong Xia ◽  
George J. Weng
Keyword(s):  
Experimental Data ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Percolation Threshold ◽  
Polymer Nanocomposites ◽  
Electromagnetic Interference ◽  
Effective Medium Theory ◽  
Scale Model ◽  
Shielding Effectiveness ◽  
Emi Shielding

Recent experiments have revealed two distinct percolation phenomena in carbon nanotube (CNT)/polymer nanocomposites: one is associated with the electrical conductivity and the other is with the electromagnetic interference (EMI) shielding. At present, however, no theories seem to exist that can simultaneously predict their percolation thresholds and the associated conductivity and EMI curves. In this work, we present an effective-medium theory with electrical and magnetic interface effects to calculate the overall conductivity of a generally agglomerated nanocomposite and invoke a solution to Maxwell’s equations to calculate the EMI shielding effectiveness. In this process, two complex quantities, the complex electrical conductivity and complex magnetic permeability, are adopted as the homogenization parameters, and a two-scale model with CNT-rich and CNT-poor regions is utilized to depict the progressive formation of CNT agglomeration. We demonstrated that there is indeed a clear existence of two separate percolative behaviors and showed that, consistent with the experimental data of poly-L-lactic acid (PLLA)/multi-walled carbon nanotube (MWCNT) nanocomposites, the electrical percolation threshold is lower than the EMI shielding percolation threshold. The predicted conductivity and EMI shielding curves are also in close agreement with experimental data. We further disclosed that the percolative behavior of EMI shielding in the overall CNT/polymer nanocomposite can be illustrated by the establishment of connective filler networks in the CNT-poor region. It is believed that the present research can provide directions for the design of CNT/polymer nanocomposites in the EMI shielding components.

Synthesis of New Chalcogenide Materials. The Novel One-Dimensional Semiconductor K4 Ti3 S14

1987 ◽  
Vol 97 ◽  
Author(s):  
Steven A. Sunshine ◽  
Doris Kang ◽  
James A. Ibers
Keyword(s):  
Electrical Conductivity ◽  
Solid State ◽  
Alkali Metal ◽  
The Novel ◽  
Conductivity Measurements ◽  
One Dimensional ◽  
General Utility ◽  
Solid State Materials ◽  
Chalcogenide Materials

ABSTRACTThe use of A2 Q/Q melts (A - alkali metal, Q - S or Se) for the synthesis of new one-dimensional solid-state materials is found to be of general utility and is illustrated here for the synthesis of K4 Ti3 SI4. Reaction of Ti metal with a K2 S/S melt at 375°C for 50 h affords K4 Ti3 SI4. The structure possesses one-dimensional chains of seven and eightcoordinate Ti atoms with each chain isolated from all others by surrounding K atoms. There are six S-S pairs (dave - 2.069(3) Å) so that the compound is one of TiIV and may be described as K4 [Ti3 (S)2 (S2)6]. Electrical conductivity measurements indicate that this material is a semiconductor.

scholarly journals Carbon nanotube film replacing silver in high-efficiency solid-state dye solar cells employing polymer hole conductor

2015 ◽  
Vol 19 (10) ◽  
pp. 3139-3144 ◽  
Author(s):  
Kerttu Aitola ◽  
Jinbao Zhang ◽  
Nick Vlachopoulos ◽  
Janne Halme ◽  
Antti Kaskela ◽  
...  
Keyword(s):  
Solar Cells ◽  
Carbon Nanotube ◽  
Solid State ◽  
High Efficiency ◽  
Carbon Nanotube Film ◽  
Dye Solar Cells
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