Investigation on the size dependent optical and magnetic properties of DNA assisted synthesized nanoceria for next generation spintronic devices

P. Jyothi, B. Anitha, N. Tharayil
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Abstract

Cerium oxide nanoparticles or nanoceria of average crystallite size ∼ 6, 9 and 14 nm were synthesized by chemical co-precipitation method using deoxyribonucleic acid (DNA) as capping agent. Size dependent structural, optical and magnetic properties of prepared samples were investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), UV-Visible diffuse reflectance spectroscopy and vibrating sample magnetometer (VSM) measurements. The increase in the value of optical band gap with decrease in particle size may be attributed to the quantum confinement effect. The saturation magnetization, coercivity and remanence increases as the particle size decreases from 14 nm to 9 nm. This is in view of the fact that increase in oxygen vacancies may produce magnetic moment by polarizing spins of f electrons of cerium ions located around them. The magnetic properties decreases below a critical size, since thermal energy can overcome the anisotropy and spontaneously reverse the magnetization of a particle from one easy direction to the other. The semiconducting properties along with room temperature ferromagnetism make DNA assisted synthesized nanoceria suitable for fabrication of next generation spintronic devices.Cerium oxide nanoparticles or nanoceria of average crystallite size ∼ 6, 9 and 14 nm were synthesized by chemical co-precipitation method using deoxyribonucleic acid (DNA) as capping agent. Size dependent structural, optical and magnetic properties of prepared samples were investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), UV-Visible diffuse reflectance spectroscopy and vibrating sample magnetometer (VSM) measurements. The increase in the value of optical band gap with decrease in particle size may be attributed to the quantum confinement effect. The saturation magnetization, coercivity and remanence increases as the particle size decreases from 14 nm to 9 nm. This is in view of the fact that increase in oxygen vacancies may produce magnetic moment by polarizing spins of f electrons of cerium ions located around them. The magnetic properties decreases below a critical size, since thermal energy can overcome the anisotropy and spontaneously reverse the magnet...
新一代自旋电子器件中DNA辅助合成纳米粒子的光学和磁性研究
以脱氧核糖核酸(DNA)为封盖剂,采用化学共沉淀法合成了平均晶粒尺寸为~ 6、9和14 nm的氧化铈纳米颗粒或纳米粒。通过x射线衍射(XRD)、高分辨率透射电镜(HRTEM)、紫外-可见漫反射光谱(UV-Visible漫反射光谱)和振动样品磁强计(VSM)测量研究了制备样品的结构、光学和磁性能。光学带隙值随粒子尺寸的减小而增大,这可能归因于量子约束效应。饱和磁化强度、矫顽力和剩磁随粒径从14 nm减小到9 nm而增大。这是考虑到氧空位的增加可能通过使其周围的铈离子的f电子的自旋极化而产生磁矩。由于热能可以克服各向异性,并自发地将粒子的磁化从一个容易的方向逆转到另一个方向,因此磁性能降低到临界尺寸以下。DNA辅助合成纳米陶瓷的半导体特性和室温铁磁性使其适合于制造下一代自旋电子器件。以脱氧核糖核酸(DNA)为封盖剂,采用化学共沉淀法合成了平均晶粒尺寸为~ 6、9和14 nm的氧化铈纳米颗粒或纳米粒。通过x射线衍射(XRD)、高分辨率透射电镜(HRTEM)、紫外-可见漫反射光谱(UV-Visible漫反射光谱)和振动样品磁强计(VSM)测量研究了制备样品的结构、光学和磁性能。光学带隙值随粒子尺寸的减小而增大,这可能归因于量子约束效应。饱和磁化强度、矫顽力和剩磁随粒径从14 nm减小到9 nm而增大。这是考虑到氧空位的增加可能通过使其周围的铈离子的f电子的自旋极化而产生磁矩。由于热能可以克服各向异性并自发地反转磁体,因此磁性能降低到临界尺寸以下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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