单层MnO_(2)纳米片组装的具有高质子电导率的二维微流体通道

Assembly of two-dimensional nanofluidic channel with high proton conductivity using single-layer MnO_(2) nanosheets

二维(2D)阳离子插层的单层δ-MnO_(2)(SLMO)具有独特的结构特征,在储能、催化、传感器等领域表现出优越性.然而,高均匀性的大横向尺寸SLMO纳米片的合成技术十分有限,这阻碍了相关研究.本文中,我们报道了一种插层辅助剥离的方法来制备分散性良好的大尺寸SLMO纳米片水系分散液.以少层K+插层δ-MnO_(2)(KMnO)为前驱体以确保完全剥离.由于SLMO纳米片具有良好分散性以及超薄2D形貌,SLMO纳米片可以自组装成一种柔性自支撑的薄膜来构建有序的纳米通道.这种自支撑SLMO薄膜具有1.71 mC m^(-2)的表面电荷密度与2.59×10^(-3) cm^(2) V^(-1) s^(-1)的质子迁移率.由于2D SLMO薄膜优异的性能以及易于规模化的制备,本方法将推动离子输运的研究,并使得微流体器件的构筑变得容易.

Two-dimensional(2D)single-layer δ-MnO_(2)(SLMO)with cations intercalated in the interlayers demonstrates specific structural characteristics,possessing superiority in the fields such as energy storage,catalysis,and sensor.However,the synthesis technology of large-lateral-size SLMO nanosheets with high uniformity is rare,which hinders their correlated research.Herein,we report an intercalation-assisted exfoliation approach to produce large-sized SLMO nanosheets with high dispersity in aqueous solution.Few-layer K^(+)-intercalated δ-MnO_(2)(KMnO)nanosheets were used as a precursor to ensure complete exfoliation.On account of high dispersion and ultrathin 2D morphology,SLMO nanosheets self-assembled into a flexible and free-standing film to construct ordered nanochannels.A high surface charge density of 1.71 mC m^(-2) and proton mobility of 2.59×10^(-3) cm^(2) V^(-1) s_(-1) were achieved in the free-standing SLMO film.With the extraordinary properties and easily scaled fabrication of the 2D SLMO film,this approach will pave the way for the study of confined ion transportation and enable the easy construction of nanofluidic devices.