磁性金属纳米团簇与石墨烯基底定向组装、界面机理及器件性能研究

The Youth National Science Fundation of China project mainly research on the large-scale preparation of graphene via a facile chemical approach; Synthesis of the inorganic nanostructures including Fe3O4，γ-Fe2O3、ZnO、CoFe2O4，NiFe2O4，CoZr4(PO4)6 and matel Fe、Ni et al magnetic nanostructures; Some of these above nanostructures have been successfully assembled on graphene nanosheets via a facile one-step solution-phase strategy under different reaction conditions, where the reduction process of graphite oxide sheets into graphene was accompanied; The electromagnetic properties of graphene nanocomposites and inorganic nanostructures were studied systematically; The results show that the existence of graphene significantly improved its electromagnetic properties, and the absorbing enhancement mechanism was proposed. Seven published papers and two submitted papers in review were in “Chem. Mater.” and other journals, two patents were applied. The project will carry out the related basic research deeply and systematically: to be focused on the preparation and magnetic properties of Fe, Co, Ni metal simple substance and its alloy nanoclusters; Obtain the aligned array nanogaps by etching the graphene oxide substrate, and modification of the functional groups in the edges of the etching nanogaps, in order to provide a basis for the directed assembly of metal nanoclusters with graphene. A related mechanism should be proposed by using the first principle to simulate this complex process; Assembly of metal nanoclusters/graphene nanodevices, and test the device performance and reveal its mechanism of the associate of magnetic—electric device characteristics, and thus provide a scientific basis for the design and fabrication of micro/nanodevices.

青年基金主要研究了大规模制备石墨烯便捷化学途径；合成了包括Fe及其氧化物、铁酸盐、氧化锌、磷酸锆钴及Ni等磁性无机纳米结构；实现了上述部分纳米结构与氧化石墨烯复合并通过“一步法”成功还原氧化石墨烯，获得了磁性无机/石墨烯复合纳米结构；系统研究了石墨烯复合纳米结构与无机纳米结构的电磁性能；研究表明石墨烯的复合显著提高了其电磁性能，并提出吸波增强机理。在《Chem. Mater.》等期刊发表论文7篇，投稿在审2篇，申请专利2项。本项目将继续深入系统地开展相关基础研究：拟着重研究Fe、Co、Ni 金属单质及其合金纳米团簇的制备及其磁性能；对氧化石墨烯基底进行阵列式刻蚀，并修饰刻蚀槽边缘官能团，为定向组装金属团簇与石墨烯提供材料基础，运用第一性原理模拟此复合过程，提出相关界面机理；组装金属团簇/石墨烯纳米器件，测试相关器件性能，揭示其磁—电关联器件特性机理，为相关微纳器件的设计与制备提供科学依据。

研究了磁性金属纳米团簇与石墨烯基底定向构筑和形貌结构分析方法学，利用溶液热分解自组装和溶剂热合成方法，结合与本项目相关的青年基金项目研究内容，设计组装了系列Co单质纳米团簇与石墨烯的复合体，完善了磁性金属纳米团簇与石墨烯定向组装的普适溶液方法。基于功能增强为导向的材料设计思想，我们又将此合成方法推广至磁性合金纳米团簇及其石墨烯复合材料，制备了系列磁性合金纳米团簇如FeCo, FeNi, CoNi等纳米结构，丰富了小尺寸纳米团簇复合材料制备方法学。此外，本项目还开展了部分磁性金属氧化物与石墨烯基底复合自组装及电磁、电化学性能研究，部分层状稀土氢氧化物（LRH）纳米片、层状双金属氢氧化物（LDH）与有机物杂化材料的制备及相关性能研究。探索了合成反应条件（反应温度、反应原料和反应时间等参数）对复合结构组装的影响规律, 研究了复合纳米结构材料的电化学、电磁学及其催化特性；研究了通过有机发光小分子插层的方法，调控LRH层间距，从而调控该有机/无机杂化材料的发光波长，实现蓝/绿光的转换，揭示了其与结构密切相关的磁-电关联特性机理以及能量传递促使发光增强及淬灭的机理，为相关器件的设计与制备提供了科学依据。