独立的 δ-MnO2 原子片

IF 1.8 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Sumit Chahal, Tumesh Kumar Sahu, Subhasmita Kar, Harsh Ranjan, Soumya Jyoti Ray, Prashant Kumar
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引用次数: 0

摘要

δ-二氧化锰(δ-MnO2)是一种二维材料,由于其独特的原子结构而具有鲜明的性质和特征,近年来已被广泛应用于众多学科领域,尤其是磁学、能量存储、磁共振成像、生物催化剂和荧光传感等领域。着眼于这种二维材料的巨大潜力,我们报告了最近通过自下而上的激光结晶(KMnO4水溶液)和自上而下的超声化学剥离块状MnO2粉末,一步合成MnO2纳米片的发现。通过观察 173 和 634 cm-1 处的特征拉曼峰和特征 X 射线衍射峰,证明了 δ-MnO2 纳米片的成功合成。两种方法的光带隙分别为 1.64 和 1.45 eV。我们还证明了二维二氧化锰是氨传感和应变传感的理想候选材料。δ-MnO2粉末用作锂离子电池的阴极材料时,可产生˜0.5 V的稳定电压;相反,用于锂-S电池时,可产生˜1 V的电压,所获得的电压甚至可稳定达5 h。 δ-MnO2及其与石墨烯的混合物的新合成方法有望催生未来的设备。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Free-standing δ-MnO2 atomic sheets

Free-standing δ-MnO2 atomic sheets

δ-Manganese dioxide (δ-MnO2) is a 2D material which possesses distinct properties and features due to its unique atomic structure and has already been utilized in numerous disciplines recently, especially in the field of magnetism, energy storage, magnetic resonance imaging, biocatalysts, and fluorescence sensing. Keeping an eye on the huge potential of this 2D material, we report our recent discovery of single-step synthesis of MnO2 nanosheets via bottom-up laser crystallization (of aqueous KMnO4 solution) and top-down sonochemical exfoliation of bulk MnO2 powder. The successful synthesis of δ-MnO2 nanosheets has been proved through the observation of characteristic Raman peaks at 173 and 634 cm−1 and characteristic X-ray diffraction peaks. The optical band gap was found to be 1.64 and 1.45 eV for both methods. We also demonstrated that 2D-MnO2 is a prominent candidate material for ammonia sensing and strain sensing. δ-MnO2 powder, when employed as cathode material in Li-ion batteries, results in a stable voltage of ˜0.5 V and in contrast, gives ˜1 V when used in Li-S batteries and the attained voltage is stable even for >5 h. New methods of synthesis of δ-MnO2 and its hybrids with graphene will lead to future generation devices, it is expected.

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CiteScore
5.10
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