Moderate temperature-dependent surface and volume resistivity and low-frequency dielectric constant measurements of pure and multi-walled carbon nanotube (MWCNT) doped polyvinyl alcohol thin films

2017 ◽  
Author(s):  
Matthew E. Edwards ◽  
Padmaja Guggilla ◽  
Samuel Uba ◽  
Micheal Curley ◽  
Angela Reedy ◽  
...  
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Carbon Nanotube ◽  
Polyvinyl Alcohol ◽  
Low Frequency ◽  
Volume Resistivity ◽  
Moderate Temperature ◽  
Temperature Dependent ◽  
Multi Walled Carbon Nanotube

The effect of oxidation treatment on the properties of multi-walled carbon nanotube thin films

2009 ◽  
Vol 165 (3) ◽  
pp. 135-138 ◽  
Author(s):  
Zdenko Špitalský ◽  
Christos Aggelopoulos ◽  
Georgia Tsoukleri ◽  
Christos Tsakiroglou ◽  
John Parthenios ◽  
...  
Keyword(s):  
Thin Films ◽  
Carbon Nanotube ◽  
Oxidation Treatment ◽  
Multi Walled Carbon Nanotube

Temperature-dependent thermal properties of single-walled carbon nanotube thin films

2015 ◽  
Vol 106 (18) ◽  
pp. 183108 ◽  
Author(s):  
A. Duzynska ◽  
A. Taube ◽  
K. P. Korona ◽  
J. Judek ◽  
M. Zdrojek
Keyword(s):  
Thin Films ◽  
Thermal Properties ◽  
Carbon Nanotube ◽  
Temperature Dependent ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon

Experimental Research on the Conductive Property of MWCNT Nanopaper

2015 ◽  
Vol 727-728 ◽  
pp. 137-140
Author(s):  
A Ying Zhang
Keyword(s):  
Electrical Conductivity ◽  
Electrical Resistivity ◽  
Carbon Nanotube ◽  
Electrical Properties ◽  
The Self ◽  
Vacuum Deposition ◽  
Temperature Dependent ◽  
Polycarbonate Membrane ◽  
Multi Walled Carbon Nanotube ◽  
Conductive Property

This paper presents a systematic study of the nano-sized structure and temperature dependent electrical properties. A method of synthesizing the self-assembled multi-walled carbon nanotube (MWCNT) nanopaper on hydrophilic polycarbonate membrane was explored. The process is based on the very well-defined dispersion of nanotube and controlled pressure vacuum deposition procedure. The experiment results show that the ratio changes of MWCNT in the nanopaper could lead to the changes in the electrical conductivity efficiency of the nanopaper. Furthermore, the electrical resistivity of MWCNT nanopaper decreased as temperature increase.

Enhancement on the Electrical Properties of PVDF/MgO Nanocomposite Thin Films

2015 ◽  
Vol 1134 ◽  
pp. 16-22
Author(s):  
Adillah Nurashikin Arshad ◽  
Rozana Mohd Dahan ◽  
Mohamad Hafiz Mohd Wahid ◽  
Muhamad Naiman Sarip ◽  
Mohamad Rusop Mahmood
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Low Frequency ◽  
Annealed Sample ◽  
High Resistivity ◽  
Tangent Loss ◽  
Annealing Temperatures ◽  
Metal Insulator Metal ◽  
Nanocomposite Thin Films ◽  
Tan Δ

Poly (vinylideneflouride)/nanomagnesium oxide (PVDF/MgO) film with MgO loading percentage of 7% were annealed with various annealing temperatures ranging from 70°C to 170°C. The PVDF/MgO(7%) thin films were fabricated using spin coating technique with metal-insulator-metal (MIM) configuration and the dielectric constant of PVDF/MgO(7%) with respect to annealing temperatures was studied. The PVDF/MgO nanocomposite thin films annealed at temperature of 70°C (AN70) showed an improvement in the dielectric constant of 27 at 103 Hz compared to un-annealed sample (UN), which is 21 at the same frequency. As the annealing temperatures were increased from 90°C (AN90) to 150oC (AN150), the dielectric constant of PVDF/MgO(7%) were found to gradually decreased from 25 to 12 respectively, interestingly lower than the UN thin films. AN70 also produced low value of tangent loss (tan δ) at frequency of 103 Hz. The resistivity value of AN70 was also found to increase from 3.08×104Ω.cm (UN-PVDF) to 1.05×105Ω.cm. The increased in dielectric constant, with low tangent loss and high resistivity value suggests that 70°C was the favourable annealing temperature for PVDF/MgO(7%) for application in electronic devices such as low frequency capacitor.

scholarly journals Electrical and Structural Properties of PVDF/Mgo (7%) Nanocomposites Thin Films at Various Annealing Temperatures

2017 ◽  
Vol 3 (1) ◽  
pp. 8 ◽  
Author(s):  
Rozana Mohd Dahan ◽  
Arshad A.N. ◽  
Wahid M.H. ◽  
Sarip M.N. ◽  
Rusop M.
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Electronic Devices ◽  
Low Frequency ◽  
Annealed Sample ◽  
High Resistivity ◽  
Tangent Loss ◽  
Annealing Temperatures ◽  
Metal Insulator Metal ◽  
Tan Δ

Abstract—Poly (vinylideneflouride)/nano-magnesium oxide (PVDF/MgO) film with 7% MgO loading percentage was annealed at various annealing temperatures ranging from 70°C to 150°C. The PVDF/MgO thin film was fabricated using spin coating technique with a metal-insulator-metal (MIM) configuration. The dielectric and electric properties of PVDF/MgO with respect to annealing temperatures was studied. The PVDF/MgO nanocomposites thin films annealed at temperature of 70°C (AN70-PVDF/MgO) showed an improvement in the properties; dielectric constant value of 26 at 1 kHz frequency compared to un-annealed sample (UN-PVDF/MgO), which is 21 at the same frequency. As the annealing temperatures were increased from 90°C (AN90) to 150°C (AN150-PVDF/MgO), the dielectric constant values were found to gradually decreased from 25 to 12 respectively, which was lower than the UN-PVDF/MgO thin films. AN70-PVDF/MgO also produced relatively low tangent loss (tan δ). The resistivity value of AN70-PVDF/MgO was also found to increase from 3.08x104 Ω.cm (UN- PVDF/MgO) to 4.55x104 Ω.cm. The increased in the dielectric constant, with low tangent loss and high resistivity value suggests that 70°C was the favorable annealing temperature for PVDF/MgO film suitable for the application in electronic devices such as low frequency capacitor.

scholarly journals Impedance Analysis and Noise Measurements on Multi Walled Carbon Nanotube Networks

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7509
Author(s):  
Usha Philipose ◽  
Yan Jiang ◽  
Brianna Western ◽  
Michael Harcrow ◽  
Chris Littler ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Low Frequency ◽  
Impedance Analysis ◽  
Frequency Range ◽  
Electrical Measurements ◽  
Electrical Equivalent Circuit ◽  
Host Matrix ◽  
Multi Walled Carbon Nanotube ◽  
Frequency Independent ◽  
Noise Measurements

The electrical impedance characteristics of multi-walled carbon nanotube (MWCNTs) networks were studied as a function of CNT concentrations in the frequency range of 1 kHz–1 MHz. The novelty of this study is that the MWCNTs were not embedded in any polymer matrix and so the response of the device to electrical measurements are attributed to the CNTs in the network without any contribution from a polymer host matrix. Devices with low MWCNT packing density (0.31–0.85 µg/cm2) exhibit a frequency independent plateau in the low-frequency regime. At higher frequencies, the AC conductivity of these devices increases following a power law, characteristic of the universal dynamic response (UDR) phenomenon. On the other hand, devices with high MWCNT concentrations (>1.0 µg/cm2) exhibit frequency independent conductivity over the entire frequency range (up to 1 MHz), indicating that conduction in these devices is due to direct contact between the CNTs in the network. A simple single-relaxation time electrical equivalent circuit with an effective resistance and capacitance is used to describe the device performance. The electrical noise measurements on devices with different MWCNT packing densities exhibit bias-dependent low-frequency 1/f noise, attributed to resistance fluctuations.

Temperature-dependent nonlinear phonon behavior in high-density carbon nanotube thin films

2014 ◽  
Vol 105 (21) ◽  
pp. 213105 ◽  
Author(s):  
A. Duzynska ◽  
J. Judek ◽  
M. Zdrojek
Keyword(s):  
Thin Films ◽  
Carbon Nanotube ◽  
High Density ◽  
Temperature Dependent

scholarly journals Preparation and electrical properties of polyimide/carbon nanotubes composites

2018 ◽  
Vol 35 (4) ◽  
pp. 755-759 ◽  
Author(s):  
Aseel A. Kareem
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Constant ◽  
High Dielectric Constant ◽  
Low Frequency ◽  
Space Charge Polarization ◽  
Dielectric Constants ◽  
Sem Images ◽  
Multi Walled Carbon Nanotube ◽  
Polarization Mechanism ◽  
High Dielectric

Abstract Polyimide/MWCNTs nanocomposites have been fabricated by solution mixing process. In the present study, we have investigated electrical conductivity and dielectric properties of PI/MWCNT nanocomposites in frequency range of 1 kHz to 100 kHz at different MWCNTs concentrations from 0 wt.% to 15 wt.%. It has been observed that the electrical conductivity and dielectric constants are enhanced significantly by several orders of magnitude up to 15 wt.% of MWCNTs content. The electrical conductivity increases as the frequency is increased, which can be attributed to high dislocation density near the interface. The rapid increase in the dielectric constant at a high MWCNTs content can be explained by the formation of a percolative path of the conducting network through the sample for a concentration corresponding to the percolation threshold. The high dielectric constant at a low frequency (1 kHz) is thought to originate from the space charge polarization mechanism. I-V characteristics of these devices indicate a significant increase in current with an increase in multi-walled carbon nanotube concentration in the composites. The SEM images show improved dispersion of MWCNTs in the PI matrix; this is due to the strong interfacial interactions.

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