Biomaterials and Tissue Engineering Research Group, Department of Interdisciplinary Technologies, Breast Cancer Research Center, Motamed Cancer Institute, ACECR, Tehran, Iran.
Department of Mechanical Engineering (BK21 Four), College of Engineering, Kyung Hee University, Yongin, Republic of Korea.
Sci Rep. 2022 Mar 30;12(1):5406. doi: 10.1038/s41598-022-09398-0.
This study focuses on the contact regions among neighboring nanoparticles in polymer graphene nanocomposites by the extension of nanosheets. The resistance of graphene and the contact zones represent the total resistance of the prolonged nanosheets. Furthermore, the graphene size, interphase depth, and tunneling distance express the effective volume portion of graphene, while the onset of percolation affects the fraction of percolated nanosheets. Finally, a model is developed to investigate the conductivity of the samples using the graphene size, interphase depth, and tunneling size. In addition to the roles played by certain factors in conductivity, the experimental conductivity data for several samples confirm the conductivity predictions. Generally, the polymer sheet in tunnels determines the total resistance of the extended nanosheets because graphene ordinarily exhibits negligible resistance. In addition, a large tunnel positively accelerates the onset of percolation, but increases the tunneling resistance and attenuates the conductivity of the nanocomposite. Further, a thicker interphase and lower percolation threshold promote the conductivity of the system. The developed model can be applied to optimize the biosensors detecting the breast cancer cells.
本研究通过扩展纳米片关注聚合物石墨烯纳米复合材料中相邻纳米颗粒之间的接触区域。石墨烯的电阻和接触区域代表了延长纳米片的总电阻。此外，石墨烯的尺寸、相间深度和隧道距离表示石墨烯的有效体积部分，而渗流的开始影响渗流纳米片的分数。最后，建立了一个模型，使用石墨烯尺寸、相间深度和隧道尺寸来研究样品的电导率。除了某些因素在电导率中所起的作用外，几个样品的实验电导率数据也证实了电导率的预测。一般来说，由于石墨烯通常表现出可以忽略不计的电阻，因此隧道中的聚合物片决定了扩展纳米片的总电阻。此外，大的隧道可以积极加速渗流的开始，但会增加隧道电阻并降低纳米复合材料的电导率。此外，较厚的相间和较低的渗流阈值可以提高系统的电导率。所开发的模型可用于优化检测乳腺癌细胞的生物传感器。
