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δ-MnO2 Nanoflowers and Their Reduced Graphene Oxide Nanocomposites for Electromagnetic Interference Shielding
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-10-21 , DOI: 10.1021/acsanm.0c02247 Jayanta Mondal 1 , Suneel Kumar Srivastava 1
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-10-21 , DOI: 10.1021/acsanm.0c02247 Jayanta Mondal 1 , Suneel Kumar Srivastava 1
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The present work is focused on room-temperature reduction by subjecting reduction of an aqueous KMnO4 and KMnO4/graphene oxide (GO) dispersion by Fehling solution B in one step to form δ-MnO2, exhibiting hierarchical nanoflowers and their nanocomposites (δ-MnO2/reduced graphene oxide). This was followed by their characterization by X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), surface area measurements, and DC conductivity. The effect of the concentration of a reducing agent on the morphological evolution of δ-MnO2 has also been proposed. Further, these materials were also investigated for their performance in electromagnetic interference (EMI) shielding efficiency (SE) in the frequency range of 2–8 GHz. These findings showed the highest total shielding efficiency (∼39 dB) of the δ-MnO2/reduced graphene oxide (RGO)-1.0 nanocomposite consisting of 5.5 wt % RGO following reflection as a dominant mechanism. Such excellent performance was attributed to the poor impedance matching between MnO2/RGO, the formation of an interconnected conducting network, and interfacial polarization. It is anticipated that δ-MnO2/RGO nanocomposites synthesized by a simple room-temperature reaction in one step could be promising candidates as lightweight and high-performance EMI shielding materials for multifaceted applications.
中文翻译：
δ-的MnO 2纳米花及其还原氧化石墨烯纳米复合材料电磁干扰屏蔽
目前的工作是通过使还原水的KMnO的集中于室温还原4和的KMnO 4在一个步骤中，以形成由费林溶液B /石墨烯氧化物（GO）分散δ-的MnO 2，表现出分层纳米花和它们的纳米复合材料（δ -MnO 2 /还原的氧化石墨烯）。然后通过X射线衍射（XRD），傅立叶变换红外光谱（FTIR），拉曼光谱，X射线光电子能谱（XPS），场发射扫描电子显微镜（FESEM），表面积测量和DC进行表征电导率。还原剂的浓度对的形态演变的效应δ-的MnO 2也已经提出。此外，还对这些材料在2-8 GHz频率范围内的电磁干扰（EMI）屏蔽效率（SE）的性能进行了研究。这些发现表明，δ-MnO的最高总屏蔽效率（~39分贝）2 /还原的石墨烯氧化物（RGO）由5.5％（重量）的RGO下列反射作为主要机制-1.0纳米复合材料。如此优异的性能归因于MnO 2 / RGO之间的阻抗匹配差，互连的导电网络的形成以及界面极化。据预测，δ-的MnO 2通过一个简单的室温反应一步合成的/ RGO纳米复合材料有望成为多面应用的轻量级高性能EMI屏蔽材料。
更新日期：2020-11-25
中文翻译：
δ-的MnO 2纳米花及其还原氧化石墨烯纳米复合材料电磁干扰屏蔽
目前的工作是通过使还原水的KMnO的集中于室温还原4和的KMnO 4在一个步骤中，以形成由费林溶液B /石墨烯氧化物（GO）分散δ-的MnO 2，表现出分层纳米花和它们的纳米复合材料（δ -MnO 2 /还原的氧化石墨烯）。然后通过X射线衍射（XRD），傅立叶变换红外光谱（FTIR），拉曼光谱，X射线光电子能谱（XPS），场发射扫描电子显微镜（FESEM），表面积测量和DC进行表征电导率。还原剂的浓度对的形态演变的效应δ-的MnO 2也已经提出。此外，还对这些材料在2-8 GHz频率范围内的电磁干扰（EMI）屏蔽效率（SE）的性能进行了研究。这些发现表明，δ-MnO的最高总屏蔽效率（~39分贝）2 /还原的石墨烯氧化物（RGO）由5.5％（重量）的RGO下列反射作为主要机制-1.0纳米复合材料。如此优异的性能归因于MnO 2 / RGO之间的阻抗匹配差，互连的导电网络的形成以及界面极化。据预测，δ-的MnO 2通过一个简单的室温反应一步合成的/ RGO纳米复合材料有望成为多面应用的轻量级高性能EMI屏蔽材料。
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