摘要
采用简单的氧化沉淀法在低温下反应1 h制备了Mn3O4纳米晶,反应过程中添加有机添加剂葡萄糖、柠檬酸、酒石酸可有效调控Mn3O4纳米晶的尺寸。通过XRD、FTIR、TEM等分析手段对Mn3O4的晶相和微观结构进行了表征。结果表明,经有机试剂调控后得到了粒径5~10 nm的Mn3O4均匀纳米晶。与空白样相比,小尺寸的Mn3O4纳米晶具有更大的比表面和更优异的电容性能。在该反应体系中,Mn2+与葡萄糖、柠檬酸和酒石酸分子中带负电的官能团作用形成了锰离子络合物,该络合物作为多相晶化反应的模板剂,可有效调控Mn3O4的尺寸。另外,在Mn3O4成核时,葡萄糖分子、柠檬酸根和酒石酸根可通过羟基、羧基和醛基这些带负电的基团吸附在晶核表面,堵塞晶核生长的活性位,得到有大比表面积、小尺寸的Mn3O4纳米晶。
Mn3O4 nanocrystals were prepared during 1 hour by a simple and innovative oxidation-precipitation method at a low temperature. Adding organic additives which included of glucose,citric acid and tartaric acid can effectively control the size of Mn3O4 nanocrystals. Crystal phase and microstructive of products were characterized by means of X-ray diffraction(XRD),Fourier Transform infrared spectroscopy(FTIR)and transmission electron microscopy(TEM). The results indicated that products were the size of 5~10 nm Mn3O4 namocrystals regulated by organic additives. The pony-size Mn3O4 nanocrystals have greater specific surface and superior capacitance properties than blank sample. In the experimental system,Mn(II)cations interacted with negative functional groups of glucose,citric acid or tartaric acid and then formed complex cations,which acted as a template of the heterogeneousnucleation of Mn3O4,thus,the size of Mn3O4 was modulated effectively. On the other hand,glucose,citrate and tartarate were absorbed on the surface of the formed crystal nucleus,some active growth sites were blocked,thus,crystal growth was inhebited,finally leading to the formation of a large number of dinky particles with high specific surface area.
作者
周自成
张文育
李煦
冯爽
范小振
Zhou Zicheng;Zhang Wenyu;Li Xu;Feng Shuang;Fan Xiaozhen(School of Chemistry and Chemical Engineering,Cangzhou Normal University,Cangzhou 061001,China)
出处
《金属矿山》
CAS
北大核心
2019年第12期108-112,共5页
Metal Mine
