Journal
APPLIED PHYSICS LETTERS
Volume 99, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3646909
Keywords
charge injection; doping; nanocomposites; nanoparticles; polymers; pulsed electroacoustic methods; space charge; zinc compounds
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Funding
- National Key Basis and Development Plan (973) [2009CB724505]
- National Natural Science Foundation [60871073]
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This letter intends to reveal the mechanism of space charge suppression in low density polyethylene (LDPE)/ZnO nanocomposites. Trap level and space charge distributions were obtained from modified isothermal discharge current method and pulsed electro-acoustic (PEA) method, respectively. The results showed that ZnO nanoparticle doping introduced large amounts of deep trapping states, significantly reduced space charge accumulation and conduction current. The results can be explained in terms of deep trapping states resulted from the interface regions and morphology structure changes by nanoparticles doping, which greatly reduced the charge mobility, raised the charge injection potential at the contact and weakened impurity ionization. (C) 2011 American Institute of Physics. [doi:10.1063/1.3646909]
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