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首页> 外文会议>Asian Particle Technology Symposium >Phase transition and optical properties of iron oxide hollow nanoparticles synthesized by chemical vapor condensation
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Phase transition and optical properties of iron oxide hollow nanoparticles synthesized by chemical vapor condensation

机译：化学气相凝结法合成氧化铁空心纳米粒子的相变和光学性质

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Phase transformation of β-Fe2O3 nanoparticles synthesized by chemical vapor condensation was studied by in-situ high temperature XRD during a heat-treatment up to 800 C with a heating rate of 10 C/min. Differently from early literatures explaining a direct transformation from p to a phase, the p phase having a hollow structure in the present work was transformed to y phase. Also, it was found from XRD patterns that the y phase stably existed without a transformation to a phase until the heat treatment was finished. TEM observation revealed that a few particles remaining in the morphology still had a hollow structure after heat-treatment.From an optoelectronic study using UV-visible spectrophotometer, it was found that the p-Fe2O3 hollow nanoparticles showed a band gap energy of 1.84 eV from the light absorption at wavelength of 674 nm. This value corresponded to the previously reported values, 1.73 eV and 1.97 eV for amorphous and polycrystalline β-Fe2O3 thin films, respectively. Finally, it was found that the optical transmittance of β-Fe2O3 hollow nanoparticles increased rapidly at 550 nm in the visible-light region. However, the increase of transmittance was restricted under 35%.
机译：在高达800 C的加热速率和10 C / min的加热速率下，通过原位高温XRD研究了通过化学气相冷凝法合成的β-Fe2O3纳米粒子的相变。与早期文献解释从p到相的直接转变不同，本研究中具有空心结构的p相转变为y相。而且，从XRD图谱发现，直到热处理完成为止，y相稳定地存在而没有转变为相。 TEM观察表明，热处理后残留在形态中的一些颗粒仍然具有中空结构。使用紫外可见分光光度计进行的光电研究发现，p-Fe2O3中空纳米颗粒的能带隙能量为1.84 eV。在674 nm波长处的光吸收。该值分别对应于先前报道的非晶态和多晶β-Fe2O3薄膜的1.73 eV和1.97 eV。最后，发现β-Fe2 O 3空心纳米粒子在可见光区域中在550nm处的透光率迅速增加。但是，透射率的增加被限制在35％以下。

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