材料科学
碳化钛
复合数
电介质
钛
复合材料
碳化物
纤维素
MXenes公司
化学工程
纳米技术
冶金
光电子学
工程类
作者
Vida Jurečič,Subramanian Lakshmanan,Nikola Novak,Vanja Kokol,V. Bobnar
出处
期刊:APL Materials
[American Institute of Physics]
日期:2024-11-01
卷期号:12 (11)
摘要
Cellulose-based nanomaterials are fascinating renewable biosystems, yet low thermal conductivity and dielectric permittivity often limit their potential applications in flexible electronics. We report dielectric properties of composite films prepared by vacuum filtration or solvent casting method from the native (CNF) or carboxylated (TCNF) cellulose nanofibrils and high electrically and thermally conductive 2D titanium carbide (Ti3C2Tx) MXenes. Measurements over broad frequency and temperature ranges revealed the influence of preparation method and type of nanofibrils matrix on the overall dielectric response, as well as a notable impact of absorbed water, particularly on the cellulose’s secondary β and γ relaxations. A detailed investigation of material with the lowest amount of impurities, vacuum-filtered MXene/CNF composites, confirmed that the dielectric response follows the predictions of the percolation theory. The resulting strong enhancement of the dielectric permittivity on increasing MXene content demonstrates the potential of developed composites for applications in eco-friendly dielectric and piezoelectric devices.
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