scholarly journals Pressure-sensitive properties of carbon nanotubes/bismuth sulfide composite materials

2017 ◽  
Vol 7 ◽  
pp. 184798041770708 ◽  
Author(s):  
Asar Ali ◽  
Adam Khan ◽  
Amjad Ali ◽  
Mushtaq Ahmad
Keyword(s):  
Carbon Nanotubes ◽  
Applied Pressure ◽  
Hydraulic Press ◽  
Electrical Contacts ◽  
Bismuth Sulfide ◽  
Pressure Sensitive ◽  
Sandwich Type ◽  
Direct Current Resistance ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In this work, the pressure-sensitive properties of pure multi-walled carbon nanotubes and multi-walled carbon nanotubes/bismuth sulfide composite are investigated and compared. Composite was prepared by 50 wt% of each ingredient. Sandwich-type pressure-sensitive pellets (Ag/CNT/Ag and Ag/CNT-Bi2S3/Ag) of 2 mm in thickness and 15 mm in diameter were fabricated at a pressure of 6894.8 kNm−2 by Mortar and Pestle/Hydraulic Press technique. Both sides of the prepared samples were painted with silver paste to provide low resistance electrical contacts. Both the samples exhibited decrease in direct current resistance with the increase in the applied pressure (0–16.9 kNm−2). However, decrease in the resistance of multi-walled carbon nanotubes/bismuth sulfide composite was 1.2 times and sensitivity was 1.07 times higher than the pure carbon nanotubes. Experimental results were compared with simulated results that showed excellent agreement with each other.

Electrophoretic Deposition of Carbon Nanotubes for Interconnections in Microelectronics

2013 ◽  
Vol 1559 ◽  
Author(s):  
Chiew Keat Lim ◽  
Yadong Wang ◽  
Shixin Wu
Keyword(s):  
Carbon Nanotubes ◽  
Electric Fields ◽  
Electrophoretic Deposition ◽  
Flip Chip ◽  
Low Cost ◽  
Electrical Contacts ◽  
Mechanical And Thermal Properties ◽  
Multi Walled Carbon Nanotubes ◽  
Bond Pads ◽  
Walled Carbon Nanotubes

ABSTRACTCarbon nanotubes (CNTs) have been considered as a promising interconnect material to replace the solder bump used in the flip chip package because of their special electrical, mechanical and thermal properties, which may promote both the performance and reliability of the flip chip packaging. In this paper, electrophoretic deposition (EPD) of CNTs on substrates has been demonstrated for the interconnect application. EPD is a simple, low cost and high throughput process that is capable to produce densely packed film with good homogeneity at low temperature. By altering the electric fields and deposition time during the EPD process, the thickness of the CNTs film could be controlled. In this study, multi-walled carbon nanotubes (MWCNTs) were successfully coated on the various substrates using the EPD method. A highly uniform CNTs microstructure film with thickness over 5 µm was achieved. In addition, the selective depositions of CNTs on the pre-defined bond pads to form CNTs bumps were also accomplished. By employing typical flip-chip bonding technique, high density CNTs bumps were aligned to form a test chip/host substrate interconnects. The electrical conductivity of the CNTs interconnects was carried out using four-point probe measurement. Reliable electrical contacts with linear relationship in the current-voltage (I-V) characteristic suggesting ohmic behaviour were attained. The overall resistances extracted were also relatively low. These superior electrical properties have demonstrated that the CNTs bumps deposited using EPD method is a viable way to serve as an alternative to current metal solder interconnects material such as Sn-Pb alloys. Hence, it offers a promising interconnect application in the quest for device miniaturization in microelectronic industry.

scholarly journals Fabrication and Characterization of Physical and Mechanical Properties of Carbon Nanotubes—Graphene-Based Sandwich Composite Pressure Sensor

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1284
Author(s):  
Asar Ali ◽  
Farman Ali ◽  
Ahmad Rashedi ◽  
Ammar Armghan ◽  
M. R. Nurul Fajita ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Applied Pressure ◽  
Pressure Sensors ◽  
Physical And Mechanical Properties ◽  
Hydraulic Press ◽  
Sandwich Composite ◽  
Multiwalled Carbon ◽  
Sandwich Type ◽  
Ag Paste

In this work, piezoresistive properties of graphene-multiwalled carbon nanotubes (MWCNTs) composites are investigated, characterized, and compared. Sandwich-type composite piezoresistive pressure-sensitive sensors (Ag/Graphene-MWCNT/Ag) with the same diameters, but different fabrication pressures and thicknesses were fabricated using the mortar and pestle/hydraulic press technique. To produce low-electrical-resistance contacts, both sides of the composite sensors were painted with silver (Ag) paste. All the sensors showed reductions in the direct current (DC) resistance ‘R’ with an increment in external uniaxial applied pressure. However, it was observed that higher fabrication pressure led to a lower resistance value of the composite, while the thicker samples give lower electrical conductivity and higher resistance than the thinner samples. The experimental data for all composite pressure sensors were in excellent agreement with the simulated results.

Preparation and Characterization of Purified Multi-Walled Carbon Nanotubes Filled Conductive Adhesive

2013 ◽  
Vol 341-342 ◽  
pp. 175-178
Author(s):  
Fan Zhang ◽  
Shu Hua Qi ◽  
Yi Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Conductive Adhesives ◽  
Pressure Sensitive Adhesive ◽  
Electrically Conductive ◽  
Oxidation Treatment ◽  
Pressure Sensitive ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Xrd And Tem

In this paper, purified multi-walled carbon nanotubes (MWNTs) were obtained by acid treatment and oxidation treatment using the crude MWNTs, then purified MWNTs were filled into acrylate pressure-sensitive adhesive (PSA) to produce electrically conductive adhesives (ECAs). XRD and TEM results showed that the impurities were greatly eliminated after purification treatment. The electrical conductivity of the ECAs increased gradually as the content of the purified MWNTs increased. When the content of the purified MWNTs is 4.0vol%, the properties of ECAs are optimum.

Influence of electrical contacts on the 1/fnoise in individual multi-walled carbon nanotubes

2010 ◽  
Vol 21 (33) ◽  
pp. 335702 ◽  
Author(s):  
Kanghyun Kim ◽  
Doyoung Jang ◽  
Kangho Lee ◽  
Haeyong Kang ◽  
Byung Yong Yu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Contacts ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Pressure Sensitive Sensors Based on Carbon Nanotubes, Graphene, and Its Composites

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Asar Ali ◽  
Adam Khan ◽  
Kh. S. Karimov ◽  
Amjad Ali ◽  
Adnan Daud Khan
Keyword(s):  
Carbon Nanotubes ◽  
Reasonable Agreement ◽  
Applied Pressure ◽  
Pressure Sensors ◽  
Optical And Electrical Properties ◽  
Electromechanical Properties ◽  
Percentage Decrease ◽  
Graphene Composite ◽  
Pressure Sensitive ◽  
Sandwich Type

Carbon nanotubes (CNTs) and graphene have attracted a great deal of interest due to their outstanding mechanical, optical, electrical, and structural properties. Most of the scientists and researchers have investigated the optical and electrical properties of these materials. However, due to unique electromechanical properties of these materials, it is required to explore the piezoresistive properties of bulk nanostructured CNTs, graphene, and CNT-graphene composites. We investigated and compared the sensitivities and piezoresistive properties of sandwich-type pure CNT, pure graphene, and CNT-graphene composite pressure sensors. For all the samples, increase in pressure from 0 to 0.183 kNm−2 results in a decrease in the impedance and direct current (DC) resistance. Sensitivity and percentage decrease in resistance and impedance of CNT-graphene composite were lower than pure CNT while being higher than pure graphene based sample. Moreover, under the same external applied pressure, the sensitivity and percentage decrease in impedance for pure CNT, pure graphene, and CNT-graphene composite were smaller than the corresponding sensitivity and percentage decrease in resistance. The achieved experimental results of the composite sample were compared with simulated results which exhibit reasonable agreement with each other. The deviations of simulated resistance-pressure and impedance-pressure curves from experimental graphs were 0.029% and 0.105%, respectively.

Multi-walled Carbon Nanotubes Penetrate into Plant Cells and Affect the Growth of Onobrychis arenaria Seedlings

Acta Naturae ◽  
2011 ◽  
Vol 3 (1) ◽  
pp. 99-106 ◽  
Author(s):  
E A Smirnova ◽  
A A Gusev ◽  
O N Zaitseva ◽  
E M Lazareva ◽  
G E Onishchenko ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Plant Cells ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes
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