Nonlinear Electrical Conductivity and Thermal Conductivity of g-C3N4/Liquid Silicone Rubber Field Grading Composites
- 1School of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
- 2School of Electrical and Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China
- 3Academy of Agricultural Planning and Engineering, Key Laboratory of Technologies and Models for Cyclic Utilization from Agricultural Resources, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
Abstract
The uneven electric field in cable accessory insulation can be optimized by field grading composite (FGC). We explored graphitic carbon nitride (g-C3N4) as a filler in liquid silicone rubber (LSR) matrices. Oxygen-doped g-C3N4 (O-g-C3N4) was prepared via calcination of g-C3N4 with ascorbic acid. Composites of g-C3N4/LSR and O-g-C3N4/LSR with different filler contents were fabricated. Microstructural and optical characterizations demonstrate that O-g-C3N4 retains the crystal structure of pristine g-C3N4 but exhibits thinner layers, modified elemental composition, and a 27.8% reduction in band gap; fillers are uniformly dispersed in the LSR matrix. Experimental measurements reveal that both composites exhibit nonlinear conductivity, while O-g-C3N4/LSR shows more pronounced nonlinearity at lower filler contents, accompanied by a faster decline in dielectric breakdown strength. There is little difference in thermal conductivity between g-C3N4/LSR and O-g-C3N4/LSR composites with the same filler content, which indicates that the change in band gap width has no significant influence on thermal conductivity. The low-cost synthesis and simple bandgap tuning method of g-C3N4 provide certain advantages for its use as a nonlinear filler in the preparation of FGC, broadening the application fields of g-C3N4, and verifying the possibility of reducing FGC filler usage through bandgap tuning.
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BibTeX
@article{han2026nonlinear,
title = {{Nonlinear Electrical Conductivity and Thermal Conductivity of g-C3N4/Liquid Silicone Rubber Field Grading Composites}},
author = {Peng Han and Li J and Peng Hu and Zheng Zhang and Chen Zhao and D Zhang},
journal = {Materials},
year = {2026},
month = jun,
doi = {10.3390/ma19112367},
url = {https://doi.org/10.3390/ma19112367},
note = {CC BY},
}
RIS
TY - JOUR
TI - Nonlinear Electrical Conductivity and Thermal Conductivity of g-C3N4/Liquid Silicone Rubber Field Grading Composites
AU - Peng Han
AU - Li J
AU - Peng Hu
AU - Zheng Zhang
AU - Chen Zhao
AU - D Zhang
PY - 2026
DA - 2026/06/02
JO - Materials
DO - 10.3390/ma19112367
UR - https://doi.org/10.3390/ma19112367
AB - The uneven electric field in cable accessory insulation can be optimized by field grading composite (FGC). We explored graphitic carbon nitride (g-C3N4) as a filler in liquid silicone rubber (LSR) matrices. Oxygen-doped g-C3N4 (O-g-C3N4) was prepared via calcination of g-C3N4 with ascorbic acid. Composites of g-C3N4/LSR and O-g-C3N4/LSR with different filler contents were fabricated. Microstructural and optical characterizations demonstrate that O-g-C3N4 retains the crystal structure of pristine g-C3N4 but exhibits thinner layers, modified elemental composition, and a 27.8% reduction in band gap; fillers are uniformly dispersed in the LSR matrix. Experimental measurements reveal that both composites exhibit nonlinear conductivity, while O-g-C3N4/LSR shows more pronounced nonlinearity at lower filler contents, accompanied by a faster decline in dielectric breakdown strength. There is little difference in thermal conductivity between g-C3N4/LSR and O-g-C3N4/LSR composites with the same filler content, which indicates that the change in band gap width has no significant influence on thermal conductivity. The low-cost synthesis and simple bandgap tuning method of g-C3N4 provide certain advantages for its use as a nonlinear filler in the preparation of FGC, broadening the application fields of g-C3N4, and verifying the possibility of reducing FGC filler usage through bandgap tuning.
SN - 1996-1944
ER -