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Related Concept Videos

Current Density01:21

Current Density

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The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Steady-State Conduction Current Performance for Multilayer Polyimide/SiO2 Films.

Muhammad Shoaib Bhutta1, Shakeel Akram2,3, Pengfei Meng2

  • 1Binjiang College, Nanjing University of Information Science & Technology, Wuxi 214105, China.

Polymers
|March 6, 2021
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Summary
This summary is machine-generated.

Polyimide (PI) nanocomposite films exhibit space charge limited current (SCLC) and Poole-Frenkel conduction. Multilayer PI nanocomposites significantly reduce current at high electric fields and temperatures, aiding electric motor insulation analysis.

Keywords:
Poole–Frenkelconduction currentmultilayer insulationpolymer nanocompositesspace charge limited current (SCLC)

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Polymer Science

Background:

  • Polyimide (PI) nanocomposites are crucial for electrical insulation systems.
  • Understanding electrical conduction mechanisms is vital for predicting material performance and breakdown.
  • Existing research highlights the need for detailed electrical property analysis of PI-based materials.

Purpose of the Study:

  • To investigate the steady-state electrical conduction current in single and multilayer polyimide (PI) nanocomposite films.
  • To identify the dominant conduction mechanisms under varying electric fields and temperatures.
  • To provide insights into the dielectric strength and breakdown phenomena of PI nanocomposite insulation.

Main Methods:

  • Experimental observation of electrical conduction current at low and high electric fields across different temperatures.
  • Fitting experimental data to established conduction models (e.g., SCLC, Poole-Frenkel, Ohmic).
  • Comparative analysis of conduction behavior in single and multilayer PI nanocomposite films.

Main Results:

  • Space Charge Limited Current (SCLC) and Poole-Frenkel conduction were identified as dominant mechanisms in most PI nanocomposite films.
  • Ohmic conduction was superseded by current-voltage dependency at high electric fields.
  • Conduction current was higher in nanocomposite films at lower temperatures, decreasing at higher temperatures.
  • Multilayer PI nanocomposite films demonstrated a substantial reduction in conduction current under high electric fields and elevated temperatures.

Conclusions:

  • The study elucidates the primary electrical conduction mechanisms in PI nanocomposite films.
  • Findings offer an empirical basis for understanding early breakdown phenomena in PI-based insulation systems.
  • Results are critical for enhancing dielectric strength and partial discharge measurements in electric motor applications.