室温铁磁性Ni^(2+)掺杂TiO_2纳米带的制备与表征(英文)

Preparation and Characterization of Room-temperature Ferromagnetic Ni-doped TiO_2 Nanobelts

通过水热离子交换方法,制得不同含量的过渡金属离子Ni2+掺杂的、锐钛矿型的TiO2纳米带.使用X射线衍射(XRD),扫描电子显微镜(SEM),透射电子显微镜(TEM),高分辨透射电子显微镜(HRTEM),X射线光电子能谱(XPS),傅立叶变换红外(FTIR)光谱和磁性测试等手段对样品进行了详尽的表征.结果表明,经过离子交换,Ni2+离子进入到了TiO2纳米带的晶格中,其中并没有形成金属Ni团簇或纳米颗粒.此外,磁性测试的结果表明,实验制备的Ni-TiO2样品具有室温铁磁性和磁滞回线特性,并且,由于TiO2纳米带中Ni2+离子有较好的分散性,在相同的外磁场条件下,样品的磁化强度随着掺杂Ni2+含量的增加而增大.

Ni-doped anatase TiO2 nanobelts （NBs） with different Ni^2＋ contents were simply prepared by combining ion-exchange with hydrothermal treatment. They were characterized by X-ray powder diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, high-resolution transmission electron microscopy （HRTEM）, X-ray photoelectron spectroscopy （XPS）, Fourier transform infrared （FTIR）, and magnetic measurement techniques. The results showed that Ni^2＋ cations doped into the TiO2 lattice and no metallic nickel clusters or nanoparticles could be found. The magnetic results demonstrated that the prepared Ni-doped TiO2 samples had complex magnetic mechanism including room-temperature ferromagnetic and paramagnetic behaviors, and with the increase of Ni^2＋ content, the magnetization also increased under the same applied field owing to uniform distribution of Ni^2＋ ions in TiO2 nanobelts.