Ultralow-temperature hydrothermal synthesis of Zn–Mn spinel nanocrystals: Its defect spinel of λ-MnO2 prepared by a soft chemical method
Ultralow-temperature hydrothermal synthesis of Zn–Mn spinel nanocrystals: Its defect spinel of λ-MnO2 prepared by a soft chemical method
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DOI：
10.1016/j.matchemphys.2012.11.029
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发表时间：
2013-02
影响因子：
4.6
通讯作者：
Lili Xue;Zhong Wu;C. Ge;Xiangdong Zhang
中科院分区：
文献类型：
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作者：
Lili Xue;Zhong Wu;C. Ge;Xiangdong Zhang
首次报道了采用超低温水热法在70℃下合成尖晶石型锌锰氧化物纳米晶，系统研究了水热温度、锌或锰源、水热时间、氢氧化钠浓度等合成工艺参数。结构和形貌表征表明，合成的锌锰尖晶石为四方相，晶体结构清晰，尺寸为10-20 nm。此外，以λ-Mn2O4纳米晶为原料，经酸浸直接合成了缺陷尖晶石纳米晶(10-20 nm)。最后，讨论了λ-MnO2形成的氧化还原机理。
An ultralow-temperature hydrothermal strategy was for the first time reported to synthesize spinel-type zinc manganese oxide (ZnMn2O4) nanocrystals at 70 °C. The synthetic parameters including hydrothermal temperature, zinc or manganese source, hydrothermal time, and NaOH concentration were systematically investigated. The structure and morphology characterization revealed that the resulting Zn–Mn spinels are tetragonal-phase, and have well-defined crystalline structure with the size of 10–20 nm. Furthermore, a defect spinel of λ-MnO2nanocrystal (10–20 nm) was directly synthesized from ZnMn2O4nanocrystal upon acid leaching. Finally, a redox mechanism for the formation of λ-MnO2was discussed.