Optical and conductivity studies of polyvinyl alcohol-MXene (PVA-MXene) nanocomposite thin films for electronic applications
Optical and conductivity studies of polyvinyl alcohol-MXene (PVA-MXene) nanocomposite thin films for electronic applications
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DOI：
10.1016/j.optlastec.2020.106772
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发表时间：
2021-04
影响因子：
5
通讯作者：
K. H. Tan;L. Samylingam;Navid Aslfattahi;R. Saidur;R. Saidur;K. Kadirgama
中科院分区：
文献类型：
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作者：
K. H. Tan;L. Samylingam;Navid Aslfattahi;R. Saidur;R. Saidur;K. Kadirgama
一种新的二维材料MXenes （Ti3C2Tx）与聚乙烯醇（PVA）结合，通过相对简单的方法，即滴铸技术，形成厚度在微米范围（7.20-7.88微米）的纳米复合材料薄膜。由于MXenes与PVA结合的多层结构导致纳米复合材料中缺陷的增加，导致结构高度无序。详细的光学研究包括紫外-可见吸收、光吸收系数、消光系数和带隙能量测定，以研究纳米复合材料的电磁波吸收能力。并对电阻率测量进行了研究。与纯PVA （1 × 10−13Sm−1）相比，PVA的电导率至少提高了3000倍。当PVA与MXenes的质量比为80:20时，纳米复合材料的σ值最高，为7.25 × 10−3Sm−1，其光学吸收系数在4000 ~ 5000 cm−1范围内。这些光学发现，以及这些纳米复合材料所表现出的电导率增强，探索了将MXenes应用于聚合物基多功能纳米复合材料的途径，用于光电子，导电填料和电磁吸收剂等各种应用。
A new family of 2D materials known as MXenes (Ti3C2Tx) is combined with polyvinyl alcohol (PVA) to form nanocomposites thin film with a thickness in micrometre range (7.20–7.88 µm) by using a relatively simple way, a drop-casting technique. The multi-layered structure of the MXenes bound together with PVA results in a high degree of structural disorder due to increasing defects in the nanocomposites. Detailed optical studies include UV–Vis absorption, optical absorption coefficient, extinction coefficient, and band gap energy determinations are conducted to investigate electromagnetic wave absorption capability of the nanocomposites. Resistivity measurement is studied as well. Electrical conductivity of the PVA is significantly increased with at least an improvement of 3000 times as compared to pure PVA (1 × 10−13Sm−1). The highest σ value of 7.25 × 10−3Sm−1is found in the nanocomposites with a mass ratio of PVA to MXenes, 80:20 with its calculated optical absorption coefficient value in range 4000–5000 cm−1. The optical findings, as well as the electrical conductivity enhancement exhibited by these nanocomposites, explore the route to apply MXenes in polymer-based multifunctional nanocomposites for various applications such as optoelectronics, conductive filler, and electromagnetic absorbers.