Zare Yasser, Munir Muhammad Tajammal, Rhee Kyong Yop
Biomaterials and Tissue Engineering Research Group, Department of Interdisciplinary Technologies, Motamed Cancer Institute, Breast Cancer Research Center, ACECR, Tehran, Iran.
College of Engineering and Technology, American University of the Middle East, 54200, Egaila, Kuwait.
Sci Rep. 2024 Jun 8;14(1):13210. doi: 10.1038/s41598-024-63981-1.
In the current article, a defective interface is characterized by "D," representing the smallest diameter of nanosheets crucial for effective conduction transfer from the conductive filler to the medium, and by "ψ" as interfacial conduction. These parameters define the effective aspect ratio and operational volume fraction of graphene in the samples. The resistances of the graphene and polymer layer in contact zones are also considered to determine the contact resistance between adjacent nanosheets. Subsequently, a model for the tunneling conductivity of composites is proposed based on these concepts. This innovative model is validated by experimental data. Additionally, the effects of various factors on the conductivity of the composites and contact resistance are analyzed. Certain parameters such as filler concentration, graphene conductivity, interfacial conduction, and "D" do not affect the contact resistance due to the superconductivity of the nanosheets. However, factors like thin and large nanosheets, short tunneling distance (d), high interfacial conduction (ψ), low "D," and low tunnel resistivity (ρ) contribute to increased conductivity in nanocomposites. The maximum conductivity of 0.09 is obtained at d = 2 nm and ψ = 900 S/m, but d > 6 nm and ψ < 200 S/m produce an insulated sample. Additionally, the highest conductivity of 0.11 S/m is achieved with D = 100 nm and ρ = 100 Ω m, whereas the conductivity approaches 0 at D = 500 nm and ρ = 600 Ω m.
在当前文章中，缺陷界面由“D”表征，“D”代表对从导电填料到介质的有效传导转移至关重要的纳米片最小直径，界面传导由“ψ”表征。这些参数定义了样品中石墨烯的有效长径比和操作体积分数。还考虑了石墨烯与聚合物层在接触区域的电阻，以确定相邻纳米片之间的接触电阻。随后，基于这些概念提出了复合材料隧穿电导率的模型。这一创新模型通过实验数据得到验证。此外，分析了各种因素对复合材料电导率和接触电阻的影响。某些参数，如填料浓度、石墨烯电导率、界面传导和“D”，由于纳米片的超导性，不会影响接触电阻。然而，诸如薄且大的纳米片、短隧穿距离（d）、高界面传导（ψ）、低“D”和低隧道电阻率（ρ）等因素有助于提高纳米复合材料的电导率。在d = 2 nm和ψ = 900 S/m时获得最大电导率0.09，但d > 6 nm且ψ < 200 S/m会产生绝缘样品。此外，在D = 100 nm和ρ = 100 Ω·m时实现最高电导率0.11 S/m，而在D = 500 nm和ρ = 600 Ω·m时电导率接近0。
