Polymer-Directed Assembly of Single Crystal Zinc Oxide/Magnetite Nanocomposites under Atmospheric and Hydrothermal Conditions
Polymer-Directed Assembly of Single Crystal Zinc Oxide/Magnetite Nanocomposites under Atmospheric and Hydrothermal Conditions
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DOI：
10.1021/acs.chemmater.6b03563
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发表时间：
2016-10-25
影响因子：
8.6
通讯作者：
Meldrum, Fiona C.
中科院分区：
文献类型：
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作者：
Kulak, Alexander N.;Grimes, Rebecca;Meldrum, Fiona C.
在晶体生长领域内，人们认识到，根据结晶条件以及添加剂和主体晶体的配对，次生物质有时会被封闭在生长的晶体内。本文从这一现象中得到启发，创造具有独特结构的多功能无机纳米复合材料：无机单晶包含嵌入无机纳米粒子。使用磁铁矿（Fe 3 O 4）/ZnO作为合适的测试系统，在用阴离子二嵌段共聚物官能化的Fe 3 O 4纳米颗粒的存在下，在90 ° C和大气压下从水溶液中沉淀ZnO晶体。使用原子吸收光谱分析的产物纳米复合晶体表明，Fe 3 O 4纳米颗粒嵌入在ZnO单晶主机内的水平约为10重量%，和TEM分析表明，有没有明显的不连续性之间的纳米颗粒和主机晶体基质。重要的是，我们证明了这种闭塞方法也可以在160摄氏度的水热条件下使用，而不会损失掺入效率。这为我们之前的闭塞研究提供了重要的进步，这些研究都是在室温下进行的，并且大大增加了使用我们的合成方法可以生成的目标材料的范围。最后，这些纳米复合材料的磁性能的测量表明，它们保留了宽带隙半导体ZnO的有吸引力的功能，同时受益于增加的磁性。
Within the field of crystal growth it is recognized that secondary species can sometimes be occluded within a growing crystal according to the crystallization conditions and pairing of the additive and host crystal. This article takes inspiration from this phenomenon to create multifunctional inorganic nanocomposites with unique structures: inorganic single crystals containing embedded inorganic nanoparticles. Using magnetite (Fe3O4)/ZnO as a suitable test system, ZnO crystals are precipitated from aqueous solution at 90 degrees C and atmospheric pressure in the presence of Fe3O4 nanoparticles functionalized with anionic diblock copolymers. Analysis of product nanocomposite crystals using atomic absorption spectroscopy shows that the Fe3O4 nanoparticles are embedded within the ZnO single crystal hosts at levels of approximately 10 wt %, and TEM analysis shows that there is no apparent discontinuity between the nanoparticles and host crystal matrix. Importantly, we then demonstrate that this occlusion approach can also be employed under hydrothermal conditions at 160 degrees C, without a loss in incorporation efficiency. This offers an important advance on our previous occlusion studies, which were all conducted at room temperature, and vastly increases the range of target materials that can be generated using our synthesis approach. Finally, measurement of the magnetic properties of these nanocomposites shows that they retain the attractive features of the wide band gap semiconductor ZnO while benefiting from added magnetism.