Flexible and conductive MXene films and nanocomposites with high capacitance
Flexible and conductive MXene films and nanocomposites with high capacitance
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DOI：
10.1073/pnas.1414215111
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发表时间：
2014-11-25
影响因子：
11.1
通讯作者：
Gogotsi, Yury
中科院分区：
文献类型：
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作者：
Ling, Zheng;Ren, Chang E.;Gogotsi, Yury
MXenes是一种新的二维材料家族，将联合收割机亲水表面与金属导电性结合在一起。MXene的分层产生单层纳米片，其厚度约为纳米，横向尺寸为微米级。分层的MXene的高纵横比使其在多功能聚合物纳米复合材料中成为有前途的纳米填料。在此，将Ti 3 C2 Tx MXene与带电的聚二烯丙基二甲基氯化铵（PDDA）或电中性聚乙烯醇（PVA）混合以产生Ti 3 C2 Tx/聚合物复合材料。所制备的复合材料是柔性的，并且在Ti 3C 2 Tx/PVA复合膜的情况下具有高达2.2 × 104 S/m的电导率，并且对于纯Ti 3C 2 Tx膜具有2.4 × 105 S/m的电导率。与纯Ti 3C 2 Tx或PVA膜相比，Ti 3C 2 Tx/PVA复合材料的拉伸强度显著提高。聚合物在MXene薄片之间的嵌入和限制不仅增加了柔性，而且增强了阳离子嵌入，在2 mV/s下为MXene/PVA-KOH复合膜提供了类似于530 F/cm（3）的令人印象深刻的体积电容。据我们所知，这项研究是探索在基于聚合物的多功能纳米复合材料中使用MXenes的潜力的第一步，但这是关键的一步，用于许多应用，例如结构组件，储能设备，可穿戴电子产品，电化学致动器和射频屏蔽，仅举几例。
MXenes, a new family of 2D materials, combine hydrophilic surfaces with metallic conductivity. Delamination of MXene produces single-layer nanosheets with thickness of about a nanometer and lateral size of the order of micrometers. The high aspect ratio of delaminated MXene renders it promising nanofiller in multifunctional polymer nanocomposites. Herein, Ti3C2Tx MXene was mixed with either a charged polydiallyldimethylammonium chloride (PDDA) or an electrically neutral polyvinyl alcohol (PVA) to produce Ti3C2Tx/polymer composites. The as-fabricated composites are flexible and have electrical conductivities as high as 2.2 x 10(4) S/m in the case of the Ti3C2Tx/PVA composite film and 2.4 x 105 S/m for pure Ti3C2Tx films. The tensile strength of the Ti3C2Tx/PVA composites was significantly enhanced compared with pure Ti3C2Tx or PVA films. The intercalation and confinement of the polymer between the MXene flakes not only increased flexibility but also enhanced cationic intercalation, offering an impressive volumetric capacitance of similar to 530 F/cm(3) for MXene/PVA-KOH composite film at 2 mV/s. To our knowledge, this study is a first, but crucial, step in exploring the potential of using MXenes in polymer-based multifunctional nanocomposites for a host of applications, such as structural components, energy storage devices, wearable electronics, electrochemical actuators, and radiofrequency shielding, to name a few.