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以乙二醇为溶剂,采用溶剂热法一步合成圆饼状LiFePO4,然后以葡萄糖为碳源与合成的LiFePO4前躯体高温烧结得到碳包覆的LiFePO4/C复合材料,其振实密度高达1.3 g·cm-3。采用X射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对LiFePO4/C复合材料进行了物相和形貌表征,研究结果表明制备得到的LiFePO4呈圆饼状,且生成的圆饼是由单晶LiFePO4纳米片堆积而成。此外,LiFePO4颗粒表面碳层包覆均匀。将制备的LiFePO4/C用作锂离子电池正极材料,电化学性能测试表明其具有高的充放电比容量(在0.1C时放电,其初始放电比容量为157.7 mAh·g-1)与良好的循环性能(500次循环后容量保持率为82.4%)。 相似文献
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以三苯胺和苯并噻唑盐为原料,设计合成了一种具有红光发射特性的D-π-A型荧光粘度探针N-乙酸乙酯基-2-(4-甲酸甲酯基三苯胺-4'-乙烯基)苯并噻唑六氟磷酸盐(L),运用现代分析测试手段进行了系统地表征。 研究结果表明,探针L的最大发射波长为630 nm,能有效地降低生物背景,提高生物成像的信噪比。 该探针对粘度有很好的荧光响应,其荧光强度比值(I/I0)的对数与粘度的对数呈现很好的线性关系(R2=0.9934)。 此外,探针L对极性的敏感性小,且荧光信号不受生物分子的干扰。 生物学研究结果表明,探针L具有低的细胞毒性,可应用于细胞内微环境粘度的荧光成像。 相似文献
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Onion-structured transition metal dichalcogenide nanoparticles by laser fabrication in liquids and atmospheres 下载免费PDF全文
Since the discovery of transition metal dichalcogenide (TMDC) nanoparticles (NPs) with the onion-like structure, many efforts have been made to develop their fabrication methods. Laser fabrication (LF) is one of the most promising methods to prepare onion-structured TMDC (or OS-TMDC) NPs due to its green, flexible, and scalable syntheses. In this mini-review article, we systematically introduce various laser-induced OS-TMDC (especially the OS-MoS2) NPs, their formation mechanism, properties, and applications. The preparation routes mainly include laser ablation in liquids and atmospheres, and laser irradiation in liquids. The various formation mechanisms are then introduced based on the different preparation routes, to describe the formations of the corresponding OS-NPs. Finally, some interesting properties and novel applications of these NPs are briefly demonstrated, and a short outlook is also given. This review could help to understand the progress of the laser-induced OS-TMDC NPs and their applications. 相似文献
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乙撑双二硫代氨基甲酸钠(商品名为代森钠,简称T_2)是由二硫代碳、乙二胺和氢氧化钠合成的农药。产品常因含有黄原酸钠等杂质而带上黄色到橙红色。通常T_2经硫酸酸化后即分解出二 相似文献