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首页> 外文期刊>Chemistry: A European journal >Ultrathin Hexagonal Hybrid Nanosheets Synthesized by Graphene Oxide-Assisted Exfoliation of b-Co(OH)_2 Mesocrystals
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Ultrathin Hexagonal Hybrid Nanosheets Synthesized by Graphene Oxide-Assisted Exfoliation of b-Co(OH)_2 Mesocrystals

机译：氧化石墨烯辅助剥落b-Co（OH）_2中间晶体合成超薄六角形杂化纳米片

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In the present study, we report the synthesis of a high-quality, single-crystal hexagonal b-Co(OH)_2 nanosheet, exhibiting a thickness down to ten atomic layers and an aspect ratio exceeding 900, by using graphene oxide (GO) as an exfoliant of b-Co(OH)_2 nanoflowers. Unlike conventional approaches using ionic precursors in which morphological control is realized by structure-directing molecules, the b-Co(OH)_2 flower-like superstructures were first grown by a nanoparticle-mediated crystallization process, which results in large 3D superstructure consisting of ultrathin nanosheets interspaced by polydimethoxyaniline (PDMA). Thereafter, b-Co(OH)_2 nanoflowers were chemically exfoliated by surfaceactive GO under hydrothermal conditions into unilamellar single-crystal nanosheets. In this reaction, GO acts as a twodimensional (2D) amphiphile to facilitate the exfoliation process through tailored interactions between organic and inorganic molecules. Meanwhile, the on-site conjugation of GO and Co(OH)_2 promotes the thermodynamic stability of freestanding ultrathin nanosheets and restrains further growth through Oswald ripening. The unique 2D structure combined with functionalities of the hybrid ultrathin Co(OH)2 nanosheets on rGO resulted in a remarkably enhanced lithiumion storage performance as anode materials, maintaining a reversible capacity of 860 mAhg~(-1) for as many as 30 cycles. Since mesocrystals are ubiquitous and rich in morphological diversity, the strategy of the GO-assisted exfoliation of mesocrystals developed here provides an opportunity for the synthesis of new functional nanostructures that could bear importance in clean renewable energy, catalysis, photoelectronics, and photonics.
机译：在本研究中，我们报告了通过使用氧化石墨烯（GO）合成高质量的单晶六角形b-Co（OH）_2纳米片的方法，该片材的厚度低至10个原子层，长宽比超过900。作为b-Co（OH）_2纳米花的去角质剂。与传统的使用离子前体的方法不同，离子前体是通过结构定向分子来实现形态控制的，而b-Co（OH）_2花状超结构首先是通过纳米粒子介导的结晶过程生长的，这导致了由超薄组成的大型3D超结构纳米片被聚二甲氧基苯胺（PDMA）隔开。此后，在水热条件下通过表面活性GO将b-Co（OH）_2纳米花化学剥落成单层单晶纳米片。在此反应中，GO充当二维（2D）两亲物，通过有机和无机分子之间的量身定制的相互作用来促进剥离过程。同时，GO和Co（OH）_2的现场结合促进了独立式超薄纳米片的热力学稳定性，并通过Oswald熟化限制了其进一步的生长。独特的2D结构与rGO上的混合超薄Co（OH）2纳米薄片的功能相结合，显着增强了作为负极材料的锂离子存储性能，可逆容量保持860 mAhg〜（-1）多达30个循环。由于介观晶体无处不在且形态多样，这里开发的GO辅助剥脱介观晶体的策略为合成可能在清洁可再生能源，催化，光电子和光子学中具有重要意义的新功能纳米结构提供了机会。

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