Phosphine-free synthesis of FeTe2 nanoparticles and self-assembly into tree-like nanoarchitectures  

作　　者：Hongyu Wang Min Wu Yixuan Wang Hao Wang Xiaoli Huang Xinyi Yang 王红宇;武敏;王艺璇;王浩;黄晓丽;杨新一(State Key Laboratory of Superhard Materials,College of Physics,Jilin University,Changchun 130012,China;College of Material Science and Engineering,Jilin Jianzhu University,Changchun 130118,China)

机构地区：[1]State Key Laboratory of Superhard Materials,College of Physics,Jilin University,Changchun 130012,China [2]College of Material Science and Engineering,Jilin Jianzhu University,Changchun 130118,China

出　　处：《Chinese Physics B》2019年第10期473-477,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.11874027);the China Postdoctoral Science Foundation(Grant Nos.2019T120233 and 2017M621198)

摘　　要：Manipulating the self-assembly of transition metal telluride nanocrystals(NCs) creates opportunities for exploring new properties and device applications. Iron ditelluride(FeTe2) has recently emerged as a new class of magnetic semiconductor with three-dimensional(3D) magnetic ordering and narrow band gap structure, yet the self-assembly of FeTe2 NCs has not been achieved. Herein, the tree-like FeTe2 nanoarchitectures with orthorhombic crystal structure have been successfully synthesized by hot-injection solvent thermal approach using phosphine-free Te precursor. The morphology, size, and crystal structure have been investigated using transmission electron microscopy(TEM), high-resolution TEM(HRTEM),and powder x-ray diffraction(XRD). We study the formation process of tree-like FeTe2 NCs according to trace the change of the sample morphology with the reaction time. It was found that the FeTe2 nanoparticles show oriented aggregation and self-assembly behavior with the increase of reaction time, which is attributed to size-dependent magnetism properties of the samples. The magnetic interaction is thought to be the driving force of nanoparticle self-organization.Manipulating the self-assembly of transition metal telluride nanocrystals（NCs） creates opportunities for exploring new properties and device applications. Iron ditelluride（FeTe2） has recently emerged as a new class of magnetic semiconductor with three-dimensional（3D） magnetic ordering and narrow band gap structure, yet the self-assembly of FeTe2 NCs has not been achieved. Herein, the tree-like FeTe2 nanoarchitectures with orthorhombic crystal structure have been successfully synthesized by hot-injection solvent thermal approach using phosphine-free Te precursor. The morphology, size, and crystal structure have been investigated using transmission electron microscopy（TEM）, high-resolution TEM（HRTEM）,and powder x-ray diffraction（XRD）. We study the formation process of tree-like FeTe2 NCs according to trace the change of the sample morphology with the reaction time. It was found that the FeTe2 nanoparticles show oriented aggregation and self-assembly behavior with the increase of reaction time, which is attributed to size-dependent magnetism properties of the samples. The magnetic interaction is thought to be the driving force of nanoparticle self-organization.

关 键 词：SELF-ASSEMBLY transition metal TELLURIDES PHOSPHINE-FREE Te precursor tree-like NANOARCHITECTURES 

分 类 号：O4[理学—物理]