Rapid hydrothermal route to synthesize cubic-phase gadolinium oxide nanorods

Bulletin of materials science

Dambarudhar Mohanta¹  Nibedita Paul¹  Samiran Hazarika¹ 

[1] Department of Physics, Tezpur University, Tezpur 784 028, India$$Department of Physics, Tezpur University, Tezpur 784 028, IndiaDepartment of Physics, Tezpur University, Tezpur 784 028, India$$

关键词: Hydrothermal;    nanostructure;    rare-earth;    gadolinium oxide.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

An inexpensive fabrication route and growth mechanism is being reported for obtaining quality gadolinium oxide (Gd₂O₃) nanoscale rods. The elongated nanoscale systems, as produced via a hydrothermal process, were characterized by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), optical absorption spectroscopy, photoluminescence (PL) spectroscopy, Raman spectroscopy and magnetic hysteresis measurements. XRD patterns of the nanorods, as-prepared from independent precursors of different pH, depict a cubic crystal phase and an average crystallite size of 5-6.5 nm. As revealed from HRTEM micrographs, diameter of the nanorods prepared at pH = 13.3 (∼ 7nm) was much smaller than the rods prepared at pH = 10.8 (∼ 19nm). However, the aspect ratio was more than double in the former case than the latter case. PL response was found to be dominated by defect mediated emissions, whereas Raman spectrum of a given specimen (pH = 10.8) has revealed characteristic 𝐹_g + 𝐴_g modes of cubic phase of Gd₂O₃ nanorods, apart from other independent modes. Furthermore, 𝑀 ∼ 𝐻 plot of the nanorod system (pH = 10.8) exhibited slight departure from the ideal superparamagnetic behaviour, with low remanence and coercive field values. The exploitation of one-dimensional Gd₂O₃ nanorods have immense potential in the production of advanced contrast agents, smart drives and also in making novel ferrofluids of technological relevance.

【 授权许可】

Unknown