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Assembly of two-dimensional nanofluidic channel with high proton conductivity using single-layer MnO2 nanosheets

单层MnO2纳米片组装的具有高质子电导率的二维微 流体通道

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Abstract

Two-dimensional (2D) single-layer δ-MnO2 (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-MnO2 (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 cm2 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.

摘要

二维(2D)阳离子插层的单层δ-MnO2(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-MnO2(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 cm2 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.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (51872101, 51602115, and 61434001), the National Program for Support of Top-notch Young Professionals, the Program for HUST Academic Frontier Youth Team, and the Director Fund of WNLO. We also thank facility support provided by the Center for Nanoscale Characterization & Devices, WNLO of HUST, and the Analytical and Testing Center of HUST.

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China

    Hongrun Jin  (金宏润), Zheheng Xu  (徐哲桁), Zhimi Hu  (胡志觅), Kaisi Liu  (刘凯思), Jiangjiang Duan  (段将将), Bin Hu  (胡彬), Liang Huang  (黄亮) & Jun Zhou  (周军)

  2. Rolls-Royce@NTU Corporate Lab, Nanyang Technological University, Singapore, 639798, Singapore

    Jia Li  (李嘉)

  3. MOE Key Laboratory of Hydraulic Machinery Transients, School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China

    Kang Liu  (刘抗)

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  1. Hongrun Jin  (金宏润)
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Contributions

Hu Z and Huang L designed the project. Jin H, Hu Z, Li J and Xu Z performed the experiments and analyzed the data. Jin H and Hu Z wrote the paper. Huang L and Zhou J reviewed the manuscript. All authors contributed to the general discussion.

Corresponding author

Correspondence to Liang Huang  (黄亮).

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The authors declare that they have no conflict of interest.

Supplementary information

Experimental details and supporting data are available in the online version of the paper.

Liang Huang received his BSc degree and PhD degree from Lanzhou University in 2007 and 2013, respectively. He became a principal investigator at Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology in 2016. His current interests focus on salt-assisted synthesis of 2D materials for energy conversion and storage.

Jun Zhou is a professor in WNLO at Huazhong University of Science and Technology. He received his Bachelor’s degree (2001) in materials physics and PhD degree (2007) in materials physics and chemistry from Sun Yat-sen University. He was a visiting student (2005–2006), and a research scientist (2007–2009) at Georgia Institute of Technology. His recent research interest is energy harvesting materials and devices.

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Jin, H., Li, J., Xu, Z. et al. Assembly of two-dimensional nanofluidic channel with high proton conductivity using single-layer MnO2 nanosheets. Sci. China Mater. 65, 2578–2584 (2022). https://doi.org/10.1007/s40843-021-1987-4

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  • DOI: https://doi.org/10.1007/s40843-021-1987-4

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