Room-Temperature Synthesis of Manganese Oxide Monosheets
Room-Temperature Synthesis of Manganese Oxide Monosheets
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DOI：
10.1021/ja804503f
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发表时间：
2008-11-26
影响因子：
15
通讯作者：
Kawamata, Jun
中科院分区：
文献类型：
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作者：
Kai, Kazuya;Yoshida, Yukihiro;Kawamata, Jun
由边缘共享的MnO6八面体组成的单层氧化锰纳米片（单片）的制备依赖于涉及本体模板的高温固态合成以及溶液中的离子交换和剥离反应的多步处理，需要高成本和长处理时间。在这里，我们展示了第一个单步方法，直接访问的MnO2单页，在四甲基铵阳离子的存在下，在水溶液中的Mn2+离子的化学氧化。重要的是，这种无模板反应在室温下在一天内容易进行。MnO2单片层自组装的能力允许聚集，以形成具有钾阳离子和阳离子四硫富瓦烯类似物作为嵌入剂的层状结构。此外，LB沉积方法，其中约一层的单片被沉积为每个过程中，成功地制备了LB膜的二氧化锰单片组成。
Preparation of single-layer manganese oxide nanosheets (monosheets) comprised of edge-shared MnO6 octahedra has relied on multistep processing involving a high-temperature solid-state synthesis of bulk templates, and ion-exchange and exfoliation reactions in solutions, requiring high cost and long processing time. Here we demonstrate the first single-step approach to directly access the MnO2 monosheets, by the chemical oxidation of Mn2+ ions in the presence of tetramethylammonium cations in an aqueous solution. Of importance is that this template-free reaction readily proceeds within a day at room temperature. The ability of the MnO2 monosheets to self-assemble allows aggregation, to form layered structures with potassium cations and cationic tetrathiafulvalene analogues as intercalants. Furthermore, Langmuir-Blodgett (LB) films composed of the MnO2 monosheets were successfully fabricated by the LB deposition method, in which about one layer of the monosheets was deposited for each process.