scholarly journals Multifunctional Electrically Conductive Copper Electroplated Fabrics Sensitizes by In-Situ Deposition of Copper and Silver Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3097
Author(s):  
Azam Ali ◽  
Fiaz Hussain ◽  
Ambreen Kalsoom ◽  
Tauqeer Riaz ◽  
Muhammad Zaman Khan ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Ohmic Heating ◽  
Chemical Reduction ◽  
Metal Coating ◽  
Sem Images ◽  
Electrically Conductive ◽  
In Situ Deposition ◽  
Coated Fabric ◽  
Textile Sensors

In this study, we developed multifunctional and durable textile sensors. The fabrics were coated with metal in two steps. At first, pretreatment of fabric was performed, and then copper and silver particles were coated by the chemical reduction method. Hence, the absorbance/adherence of metal was confirmed by the deposition of particles on microfibers. The particles filled the micro spaces between the fibers and made the continuous network to facilitate the electrical conduction. Secondly, further electroplating of the metal was performed to make the compact layer on the particle- coated fabric. The fabrics were analyzed against electrical resistivity and electromagnetic shielding over the frequency range of 200 MHz to 1500 MHz. The presence of metal coating was confirmed from the surface microstructure of coated fabric samples examined by scanning electron microscopy, EDS, and XRD tests. For optimized plating parameters, the minimum surface resistivity of 67 Ω, EMI shielding of 66 dB and Ohmic heating of 118 °C at 10 V was observed. It was found that EMI SH was increased with an increase in the deposition rate of the metal. Furthermore, towards the end, the durability of conductive textiles was observed against severe washing. It was observed that even after severe washing there was an insignificant increase in electrical resistivity and good retention of the metal coating, as was also proven with SEM images.

Triple functions of polyaniline in situ coated on silver powders for high-performance electrically conductive pastes

2021 ◽  
Vol 11 (7) ◽  
pp. 1231-1238
Author(s):  
Maocheng Zhang ◽  
Mengqi Yao ◽  
Ni Wang ◽  
Wencheng Hu
Keyword(s):  
Electrical Resistivity ◽  
High Performance ◽  
Chemical Reduction ◽  
Conductive Adhesive ◽  
Silane Coupling Agents ◽  
Conductive Adhesives ◽  
Electrically Conductive ◽  
Conductive Fillers ◽  
Preparation Strategy

Silver powders, with high electrical conductivity, as the conductive fillers of electrically conductive adhesives have been widely investigated in the fields of microelectronic packaging. Herein, polyaniline (PANI)-coated silver powders were successfully fabricated via a facile chemical reduction, followed by the polymerization of aniline. The PANI plays triple functions to synergistically improve the performance of electrically conductive pastes as follows: (1) The aniline-coated silver particles are used as an ideal dispersant to substitute polyvinyl pyrrolidone and polyethylene glycol in the preparation strategy of silver powders; (2) The polymerization of aniline plays a surface modifier role instead of silane coupling agents to prepare silver-based conductive adhesives with homodisperse silver powders; (3) The high conductivity of PANI could reduce the contact resistance between silver powders and decrease the electrical resistivity of conductive adhesive films significantly. As a result, the PANI coats silver powders (pH = 3) show a decreased electrical resistivity of conductive adhesive films of 4.24×10−5 Ω·cm with the shear resistance of 9.06 MPa and the sheet resistance of 10.6 mΩ.sq−1. This work provides an efficient way to controllably synthesize PANI-coated silver powders for high-performance electrically conductive pastes.

Spark Plasma Sintering of Silicon Nitride-Boron Carbide Composites

2008 ◽  
Vol 403 ◽  
pp. 225-226
Author(s):  
E. Ayas ◽  
A. Kalemtas ◽  
Gürsoy Arslan ◽  
Alpagut Kara ◽  
Ferhat Kara
Keyword(s):  
Electrical Resistivity ◽  
Spark Plasma Sintering ◽  
Xrd Analysis ◽  
Sintering Process ◽  
Electrically Conductive ◽  
Plasma Sintering ◽  
B4c Particles ◽  
Spark Plasma ◽  
In Situ Reactions

Si3N4-B4C composites containing fine and coarse B4C particles were produced using Al2O3 and Y2O3 as sintering additives via spark plasma sintering (SPS) technique. Phase assemblages of the produced composites were determined by XRD analysis. Si3N4, B4C and in situ formed SiC, h-BN and Si phases were observed. Even when incorporated in significant amounts, B4C was consumed readily in the Si3N4 based system. Consequently, full densification of these composites was found to be a very difficult task due to the simultaneous in-situ reactions, even in fast sintering process. Electrical resistivity measurements carried out at room temperature indicated that addition of both fine and coarse B4C particles decreased the electrical resistivity by several orders of magnitude due to the formation of electrically conductive in-situ phases, mainly SiC and metallic Si.

In situ chemical reduction and functionalization of graphene oxide for electrically conductive phenol formaldehyde composites

Carbon ◽  
2014 ◽  
Vol 68 ◽  
pp. 653-661 ◽  
Author(s):  
Fang-Yuan Yuan ◽  
Hao-Bin Zhang ◽  
Xiaofeng Li ◽  
Hui-Ling Ma ◽  
Xiao-Zeng Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Phenol Formaldehyde ◽  
Chemical Reduction ◽  
Electrically Conductive

Electrical Resistivity Control of Hot-Pressed Aluminum Nitride Ceramics

2008 ◽  
Vol 403 ◽  
pp. 49-52
Author(s):  
Naohito Yamada ◽  
Jun Yoshikawa ◽  
Yuji Katsuda ◽  
Hiroaki Sakai
Keyword(s):  
Electrical Resistivity ◽  
Aluminum Nitride ◽  
Second Phase ◽  
Boron Carbonitride ◽  
Electrically Conductive ◽  
Intergranular Phase ◽  
Second Phase Particles ◽  
Wide Range ◽  
Nitride Ceramics

Aluminum Nitride (AlN) ceramics are used as wafer heating plates and wafer holding electrostatic chucks in semiconductor fabrication equipments. For tailoring the electrical resistivity to satisfy the requirements of each component, several kinds of approaches were investigated for hot-pressed AlN ceramics. Three techniques to control the electrical resistivity of AlN ceramics were adopted: (1) AlN intragranular control, (2) intergranular phase control and (3) incorporation of electrically conductive second phase particles. In this paper, we introduce examples of each technique. The first one is addition of a small amount of Y2O3. The resistivity varied from 1015 Ωcm to 1010 Ωcm with the Y2O3 amount. The second one is addition of Sm2O3. The resistivity also varied from 1015 Ωcm to 1010 Ωcm with the Sm2O3 amount. The third one is incorporation of in-situ synthesized Boron Carbonitride (B-C-N). Networking of B-C-N platelets drastically decreased the resistivity to the range less than 102 Ωcm. By these techniques, it was possible to control the resistivity of AlN ceramics in a wide range with a small amount of additives.

In-situ electrical-resistivity measurements in the high-voltage electron microscope

1978 ◽  
Vol 36 (1) ◽  
pp. 68-69
Author(s):  
W. E. King
Keyword(s):  
Electrical Resistivity ◽  
Electron Microscope ◽  
High Voltage ◽  
Resistivity Measurements ◽  
Voltage Electron ◽  
High Voltage Electron Microscope ◽  
High Voltage Electron ◽  
Wide Range ◽  
Helium Gas

A side-entry type, helium-temperature specimen stage that has the capability of in-situ electrical-resistivity measurements has been designed and developed for use in the AEI-EM7 1200-kV electron microscope at Argonne National Laboratory. The electrical-resistivity measurements complement the high-voltage electron microscope (HVEM) to yield a unique opportunity to investigate defect production in metals by electron irradiation over a wide range of defect concentrations.A flow cryostat that uses helium gas as a coolant is employed to attain and maintain any specified temperature between 10 and 300 K. The helium gas coolant eliminates the vibrations that arise from boiling liquid helium and the temperature instabilities due to alternating heat-transfer mechanisms in the two-phase temperature regime (4.215 K). Figure 1 shows a schematic view of the liquid/gaseous helium transfer system. A liquid-gas mixture can be used for fast cooldown. The cold tip of the transfer tube is inserted coincident with the tilt axis of the specimen stage, and the end of the coolant flow tube is positioned without contact within the heat exchanger of the copper specimen block (Fig. 2).

Functional Poly(p-Xylylene)s via Chemical Reduction of Poly(p-Phenylene Vinylene)s

2019 ◽  
Author(s):  
Ain Uddin ◽  
Weifan Sang ◽  
Yong Gao ◽  
Kyle Plunkett
Keyword(s):  
Film Formation ◽  
Chemical Reduction ◽  
Water Soluble ◽  
Phenylene Vinylene ◽  
Polymer Modification ◽  
Polymer Backbone ◽  
Crosslinking Process ◽  
Conducting Membranes ◽  
In Situ Crosslinking

The synthesis of poly(p-xylylene)s (PPXs) with sidechains containing alkyl bromide functionality, and their post-polymer modification, is described. The PPXs were prepared by a diimide hydrogenation of poly(p-phenylene vinylene)s (PPVs) that were originally synthesized by a Gilch polymerization. The polymer backbone reduction was carried out with hydrazine hydrate in toluene at 80 °C to provide polymers with the sidechain-containing bromide functionality intact. To demonstrate post-polymer modification of the sidechains, the resulting PPX polymers were modified with trimethylamine to form tetraalkylammonium ion functionality and were evaluated as anion conducting membranes. While PPX homopolymers containing tetralkylammonium ions were completely water soluble and not able to form valuable films, PPX copolymers containing mixed tetraalkylammonium ions and hydrophobic chains were capable of film formation and alkaline stability. In addition, an in situ crosslinking process that used N,N,N',N'-tetramethyl-1,6-hexanediamine during the tetraalkylammonium formation of brominated PPX polymers was also evaluated and gave reasonable films with conductivities of ~10 mS-cm-1.

Functional Poly(p-Xylylene)s via Chemical Reduction of Poly(p-Phenylene Vinylene)s

2019 ◽  
Author(s):  
Ain Uddin ◽  
Weifan Sang ◽  
Yong Gao ◽  
Kyle Plunkett
Keyword(s):  
Film Formation ◽  
Chemical Reduction ◽  
Water Soluble ◽  
Phenylene Vinylene ◽  
Polymer Modification ◽  
Polymer Backbone ◽  
Crosslinking Process ◽  
Conducting Membranes ◽  
In Situ Crosslinking

The synthesis of poly(p-xylylene)s (PPXs) with sidechains containing alkyl bromide functionality, and their post-polymer modification, is described. The PPXs were prepared by a diimide hydrogenation of poly(p-phenylene vinylene)s (PPVs) that were originally synthesized by a Gilch polymerization. The polymer backbone reduction was carried out with hydrazine hydrate in toluene at 80 °C to provide polymers with the sidechain-containing bromide functionality intact. To demonstrate post-polymer modification of the sidechains, the resulting PPX polymers were modified with trimethylamine to form tetraalkylammonium ion functionality and were evaluated as anion conducting membranes. While PPX homopolymers containing tetralkylammonium ions were completely water soluble and not able to form valuable films, PPX copolymers containing mixed tetraalkylammonium ions and hydrophobic chains were capable of film formation and alkaline stability. In addition, an in situ crosslinking process that used N,N,N',N'-tetramethyl-1,6-hexanediamine during the tetraalkylammonium formation of brominated PPX polymers was also evaluated and gave reasonable films with conductivities of ~10 mS-cm-1.

In situ deposition of magnetic nanoparticles on glass mat using plasma sputtering method

2021 ◽  
pp. 1-11
Author(s):  
Sheila Shahidi ◽  
Sanaz Dalalsharifi ◽  
Mahmood Ghoranneviss ◽  
Rattanaphol Mongkholrattanasit
Keyword(s):  
Magnetic Nanoparticles ◽  
Plasma Sputtering ◽  
In Situ Deposition ◽  
Glass Mat
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