Ti3C2Tx MXene/聚乙烯醇复合材料的介电性能

补淇; 胡静; 雷鑫; 何嘉欣; 王羽双; 欧阳跃军; 万维

doi:10.13801/j.cnki.fhclxb.20201030.001

Ti₃C₂T_x MXene/聚乙烯醇复合材料的介电性能

doi: 10.13801/j.cnki.fhclxb.20201030.001

怀化学院　化学与材料工程学院聚乙烯醇纤维材料制备技术湖南省工程实验室陶瓷材料与器件制备怀化市重点实验室，怀化 418000

基金项目: 湖南省自然科学基金项目(2018JJ314)；湖南省教育厅优秀青年项目(18B493)；聚乙烯醇纤维材料制备技术湖南省工程实验室重点开放项目(HGI201802)

详细信息

通讯作者:
万维，博士，副教授，研究方向为电介质功能材料　 E-mail：avealin1228@163.com

中图分类号: TB332
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出版历程
- 收稿日期: 2020-07-27
- 录用日期: 2020-10-26
- 网络出版日期: 2020-10-30
- 刊出日期: 2021-06-23

Dielectric properties of Ti₃C₂T_x MXene/polyvinyl alcohol composites

Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol Fiber Materials, Huaihua Key Laboratory for Preparation of Ceramic Materials and Devices, College of Chemistry and Materials Engineering, Huaihua University, Huaihua 418000, China

摘要

摘要: 以二维过渡金属碳化物Ti₃C₂T_x MXene作为填料，非铁电、可生物降解的高分子物质聚乙烯醇(PVA)作为基体，通过溶液涂膜法制备了具有高介电常数的Ti₃C₂T_x MXene/PVA柔性复合材料。研究了Ti₃C₂T_x MXene充填量对复合材料介电性能的影响。Ti₃C₂T_x MXene/PVA复合材料的介电性能变化遵循逾渗规律，随着Ti₃C₂T_x MXene充填量的增加，Ti₃C₂T_x MXene/PVA复合材料的介电常数呈先增加后减小的变化规律，Ti₃C₂T_x MXene充填量为20wt%的Ti₃C₂T_x MXene/PVA复合材料介电常数在20 Hz时高达577.3，比纯PVA的介电常数(10.5)提升了5 398%。但是，当Ti₃C₂T_x MXene充填量超过20wt%后，Ti₃C₂T_x MXene/PVA复合材料的介电常数急剧下降，介电损耗快速上升，表现出明显的逾渗行为。
- Ti₃C₂T_x /
- MXene /
- 聚乙烯醇 /
- 介电常数 /
- 介电损耗
Abstract: Flexible Ti₃C₂T_xMXene/polyvinyl alcohol (PVA) composites with high dielectric constant were fabricated by using the solution casting method with two-dimensional transition metal carbide Ti₃C₂T_x MXene as the filler and non-ferroelectric and biodegradable polyvinyl alcohol (PVA) as the matrix. The effect of Ti₃C₂T_x MXene loading on the dielectric properties of the composites were investigated. The variation of dielectric properties of the Ti₃C₂T_x MXene/PVA composites conforms to the percolation theory. With the increase of Ti₃C₂T_x MXene loading, the dielectric constant of Ti₃C₂T_x MXene/PVA composites first increases and then decreases. The composites show a dielectric constant up to 577.3 at 20 Hz frequency with Ti₃C₂T_x MXene loading of 20wt%, a 5 398% increase compared with that of the neat PVA matrix. When the Ti₃C₂T_x MXene loading exceeds 20wt%, the dielectric constant of the Ti₃C₂T_x MXene/PVA composites decreases sharply and the dielectric loss increases rapidly, showing obvious percolation behavior.
- Ti₃C₂T_x /
- MXene /
- polyvinyl alcohol /
- dielectric constant /
- dielectric loss

HTML全文

图 1 Ti₃C₂T_x MXene断面 (a) 、表面 (b) 的FE-SEM图像及XRD图谱 (c)

Figure 1. FE-SEM images of the cross-section (a) and surface (b), and XRD pattern (c) of Ti₃C₂T_x MXene

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图 2 Ti₃C₂T_x MXene/PVA复合材料的光学照片 (a)，10wt% Ti₃C₂T_x含量复合薄膜表面 (b)、20wt% Ti₃C₂T_x含量复合薄膜表面 (c)、20wt% Ti₃C₂T_x含量复合薄膜断面 (d) 的FE-SEM图像及XRD图谱 (e)

Figure 2. Optical photograph of Ti₃C₂T_x MXene/PVA composites (a), FE-SEM images of surface of the composite films with 10wt% Ti₃C₂T_x (b), surface of the composite films with 20wt% Ti₃C₂T_x (c) and cross-section of the composite films with 20wt% Ti₃C₂T_x(d) and XRD patterns of Ti₃C₂T_x MXene/PVA composites (e)

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图 3 不同Ti₃C₂T_x MXene充填量下Ti₃C₂T_x MXene/PVA复合材料的介电常数 (a)、介电损耗 (b) 及电导率 (c) 随频率的变化关系

Figure 3. Dielectric constant (a) , dielectric loss (b) and AC conductivity (c) of Ti₃C₂T_x MXene/PVA composites with different Ti₃C₂T_x MXene contents changing with frequency

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图 4 Ti₃C₂T_x MXene复合材料充填量对Ti₃C₂T_x MXene/PVA复合材料的介电常数 (a) 及介电损耗 (b) 的影响

Figure 4. Effect of Ti₃C₂T_x MXene loading on dielectric constant (a) and dielectric loss (b) of Ti₃C₂T_x MXene/PVA composites

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图 5 不同Ti₃C₂T_x MXene复合材料充填量时Ti₃C₂T_x MXene/PVA复合材料的Cole-Cole图

Figure 5. Cole-Cole plots of Ti₃C₂T_x MXene/PVA composites with different Ti₃C₂T_x MXene contents

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