摘要
在合成的MIL-88A纳米棒上包覆了一层15 nm的SiO_(2)膜,通过扫描电镜和透射电镜并结合能谱分析证明成功合成了MIL-88A@SiO_(2)核壳纳米棒。在透射电子显微镜中通过原位加热样品杆对比研究了MIL-88A纳米棒和MIL-88A@SiO_(2)核壳纳米棒在加热过程中金属颗粒的析出与迁移过程。结果表明,MOF分解过程中首先是有机配体裂解导致完整的晶体结构被破坏之后金属颗粒才逐渐析出,而MIL-88A@SiO_(2)核壳纳米棒中致密的SiO_(2)包裹抑制了有机配体的分解,延缓了金属颗粒析出的过程。
In this study,MIL-88 A nanorods were first synthesized and then coated with a layer of SiO_(2)whose thickness is about 15 nm.Through scanning electron microscopy and transmission electron microscopy,combined with energy spectrum analysis,it was proved that MIL-88 A-SiO_(2)core-shell nanorods were successfully synthesized.Finally,the precipitation and migration of metal particles in MIL-88 A nanorods and MIL-88 A@SiO_(2)core-shell nanorods during heating were compared by in-situ heating of sample rods under transmission electron microscope.The results show that in the process of MOF decomposition,the metal particles are precipitated gradually only after the complete crystal structure is destroyed due to the fragmentation of the organic ligands,while the dense SiO_(2)encapsulation in the MIL-88 A@SiO_(2)core-shell nanorods inhibits the decomposition of the organic ligands and delays the precipitation process of the metal particles.
作者
徐开兵
崔哲
陈晓
杨健茂
XU Kaibing;CUI Zhe;CHEN Xiao;YANG Jianmao(Research Center for Analysis and Measurement,Donghua University,Shanghai 201620,China;College of Materials Science and Engineering,Donghua University,Shanghai 201620,China)
出处
《实验室研究与探索》
CAS
北大核心
2021年第7期23-26,共4页
Research and Exploration In Laboratory
基金
国家自然科学基金资助项目(51602049)。
