Zare Yasser, Munir Muhammad Tajammal, Rhee Kyong Yop
Biomaterials and Tissue Engineering Research Group, Department of Interdisciplinary Technologies, Breast Cancer Research Center, Motamed Cancer Institute, ACECR, Tehran, Iran.
College of Engineering and Technology, American University of the Middle East, Egaila 54200, Kuwait.
Phys Chem Chem Phys. 2023 Dec 6;25(47):32460-32470. doi: 10.1039/d3cp04375d.
Herein, stacks of graphene nanosheets resulting from an incomplete dispersion of nanoparticles in polymer graphene nanocomposites are considered. The volume fraction, aspect ratio and conduction of stacks are expressed by the distance between nanosheets (), thickness of an individual nanosheet (), nanosheet diameter (), thickness of the interphase zone () and tunneling length (). Moreover, the percolation onset, actual filler quantity and portion of networked nanosheets are stated by the stacks of nanosheets, interphase depth and tunneling length. Finally, an advanced model for the conductivity of a graphene-based system is presented using the mentioned terms. The influence of all properties of stacks, tunneling and interphase areas on the percolation onset, portion of percolated nanosheets and conductivity are examined. Furthermore, the tested values of conductivity are applied to confirm the predictability of the model. The larger quantity of thin sheets included in stacks produces a higher conductivity for samples. In addition, a thicker interphase and smaller tunnels can result in higher conductivity. The calculations of conductivity match the tested data at all filler amounts.
在此，我们考虑聚合物石墨烯纳米复合材料中纳米颗粒不完全分散所形成的石墨烯纳米片堆叠结构。堆叠结构的体积分数、长径比和电导率由纳米片之间的距离（）、单个纳米片的厚度（）、纳米片直径（）、界面区厚度（）和隧穿长度（）来表示。此外，纳米片堆叠结构、界面深度和隧穿长度说明了渗流起始点、实际填料量以及网络化纳米片的比例。最后，使用上述术语提出了一种基于石墨烯体系电导率的先进模型。研究了堆叠结构、隧穿和界面区域的所有性质对渗流起始点、渗流纳米片比例和电导率的影响。此外，应用电导率的测试值来确认该模型的可预测性。堆叠结构中包含的薄片数量越多，样品的电导率越高。此外，较厚的界面和较小的隧穿可导致更高的电导率。在所有填料用量下，电导率的计算结果与测试数据相符。
