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Size-induced amorphous structure in tungsten oxide nanoparticles
Nanoscale ( IF 5.8 ) Pub Date : 2021-11-17 , DOI: 10.1039/d1nr05991b
Mikkel Juelsholt 1 , Andy S Anker 1 , Troels Lindahl Christiansen 1 , Mads Ry Vogel Jørgensen 2, 3 , Innokenty Kantor 2, 4 , Daniel Risskov Sørensen 2, 3 , Kirsten M Ø Jensen 1
Affiliation  

The properties of functional materials are intrinsically linked to their atomic structure. When going to the nanoscale, size-induced structural changes in atomic structure often occur, however these are rarely well-understood. Here, we systematically investigate the atomic structure of tungsten oxide nanoparticles as a function of the nanoparticle size and observe drastic changes when the particles are smaller than 5 nm, where the particles are amorphous. The tungsten oxide nanoparticles are synthesized by thermal decomposition of ammonium metatungstate hydrate in oleylamine and by varying the ammonium metatungstate hydrate concentration, the nanoparticle size, shape and structure can be controlled. At low concentrations, nanoparticles with a diameter of 2–4 nm form and adopt an amorphous structure that locally resembles the structure of polyoxometalate clusters. When the concentration is increased the nanoparticles become elongated and form nanocrystalline rods up to 50 nm in length. The study thus reveals a size-dependent amorphous structure when going to the nanoscale and provides further knowledge on how metal oxide crystal structures change at extreme length scales.

中文翻译:

氧化钨纳米颗粒中的尺寸诱导无定形结构

功能材料的特性与其原子结构有着内在的联系。当进入纳米尺度时,原子结构中的尺寸引起的结构变化经常发生,但是这些很少被很好地理解。在这里,我们系统地研究了氧化钨纳米粒子的原子结构作为纳米粒子尺寸的函数,并观察到粒子小于 5 nm 时的剧烈变化,其中粒子是无定形的。氧化钨纳米粒子通过偏钨酸铵水合物在油胺中的热分解合成,通过改变偏钨酸铵水合物浓度,可以控制纳米粒子的尺寸、形状和结构。在低浓度下,直径为 2-4 nm 的纳米粒子形成并采用无定形结构,局部类似于多金属氧酸盐簇的结构。当浓度增加时,纳米颗粒被拉长并形成长达 50 nm 的纳米晶棒。因此,该研究揭示了在进入纳米尺度时与尺寸相关的非晶结构,并提供了关于金属氧化物晶体结构如何在极端长度尺度上变化的进一步知识。
更新日期:2021-11-30
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