Inhibition Effect of Graphene on Space Charge Injection and Accumulation in Low-Density Polyethylene
Abstract
:1. Introduction
2. Materials and Methods
2.1. Sample Preparation of Graphene/LDPE Nanocomposites
2.2. Characteristics
2.3. Charge Mobility Evaluation by Space Charge Dissipation
- (a)
- The carrier mobility μ is considered as constant in space and varies only with time.
- (b)
- The volume density of trapped charges ρ is much larger than that of free charges ρf.
- (c)
- The hole-electron recombination is ignored. Hence, the charge dissipation only comes from the bulk transport of space charges to the ground. The total current density JT(t) is equal to L·dq(t)/dt.
3. Results
3.1. Characterization of Graphene/LDPE Nanocomposites
3.2. Space Charge Accumulation in Graphene/LDPE Nanocomposites
3.2.1. Effect of Temperature on Space Charge Accumulation
3.2.2. Effect of Graphene on Space Charge Accumulation
3.3. Effect of Graphene on the Carrier Mobility
4. Discussion
5. Conclusions
- Negative charge was always dominant in the samples under voltage applied at 40 and 60 °C, while the hole injection and transportation became more active than electron as the temperature rises to 80 °C, resulting in the replacement of heterocharges with homocharges in the vicinity of the anode.
- The graphene filling with a filler content of 0.005 wt % brought in a large quantity of filler-polymer interface regions containing deep trap sites, which could reduce the detrapping rate of charges and effectively inhibited the space charge injection and accumulation in the polymer.
- Large amounts of heterocharges were formed in 0.01 wt % graphene/LDPE nanocomposites under 30 kV/mm at 60 and 80 °C, and the trap-controlled carrier mobility became higher than the undoped sample.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Li, Z.; Su, J.; Du, B.; Hou, Z.; Han, C. Inhibition Effect of Graphene on Space Charge Injection and Accumulation in Low-Density Polyethylene. Nanomaterials 2018, 8, 956. https://doi.org/10.3390/nano8110956
Li Z, Su J, Du B, Hou Z, Han C. Inhibition Effect of Graphene on Space Charge Injection and Accumulation in Low-Density Polyethylene. Nanomaterials. 2018; 8(11):956. https://doi.org/10.3390/nano8110956
Chicago/Turabian StyleLi, Zhonglei, Jingang Su, Boxue Du, Zhaohao Hou, and Chenlei Han. 2018. "Inhibition Effect of Graphene on Space Charge Injection and Accumulation in Low-Density Polyethylene" Nanomaterials 8, no. 11: 956. https://doi.org/10.3390/nano8110956