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Synthesis of colloidal silver iron oxide nanoparticles—study of their optical and magnetic behavior

机译：胶态氧化铁银纳米粒子的合成—光学和磁行为研究

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Silver iron oxide nanoparticles of fairly small size (average diameter ～1 nm) with narrow size distribution have been synthesized by the interaction of colloidal β-Fe_2O_3 and silver nanoparticles. The surface morphology and size of these particles have been analyzed by using atomic force microscopy (AFM), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Their structural analysis has been carried out by employing x-ray diffraction (XRD), selected-area electron diffraction (SAED), optical and infrared (IR) spectroscopic techniques. The ageing of these particles exhibits the formation of self-assembly, possibly involving weak supramolecular interactions between Ag~IO_4 and Fe~(III)O_4 species. These particles display the onset of absorption in the near-infrared region and have higher absorption coefficient in the visible range compared to that of its precursors. Magnetic measurements reveal an interesting transition in their magnetic behavior from diamagnetic to superparamagnetic. The magnetic moment of these particles attains a limiting value of about 0.19 emu cm~(-2), which is more than two times higher than that of colloidal β-Fe_2O_3. With enhanced optical and magnetic properties, this system is suggested to have possible applications in optoelectronic and magnetic devices.
机译：通过胶体β-Fe_2O_3与银纳米粒子的相互作用，合成了粒径分布较窄，粒径较小（平均直径〜1 nm）的银氧化铁纳米粒子。通过使用原子力显微镜（AFM），场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）分析了这些颗粒的表面形态和尺寸。通过使用X射线衍射（XRD），选择区域电子衍射（SAED），光学和红外（IR）光谱技术进行了结构分析。这些颗粒的老化表现出自组装的形成，可能涉及Ag〜IO_4和Fe〜（III）O_4物质之间的弱超分子相互作用。与它们的前体相比，这些颗粒在近红外区域显示出吸收的开始，并且在可见光范围内具有更高的吸收系数。磁性测量揭示了其磁性行为从反磁性到超顺磁性的有趣转变。这些颗粒的磁矩达到约0.19emu cm·（-2）的极限值，是胶体β-Fe_2O_3的极限值的两倍以上。具有增强的光学和磁性特性，建议该系统在光电和磁性设备中具有可能的应用。

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