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首页> 外文期刊>Nanotechnology >Size-dependent surface plasmon resonance in silver silica nanocomposites
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Size-dependent surface plasmon resonance in silver silica nanocomposites

机译：银二氧化硅纳米复合材料中尺寸依赖的表面等离子体共振

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Silver silica nanocomposites were obtained by the sol - gel technique using tetraethyl orthosilicate (TEOS) and silver nitrate (AgNO3) as precursors. The silver nitrate concentration was varied for obtaining composites with different nanoparticle sizes. The structural and microstructural properties were determined by x-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). X-ray photoelectron spectroscopic (XPS) studies were done for determining the chemical states of silver in the silica matrix. For the lowest AgNO3 concentration, monodispersed and spherical Ag crystallites, with an average diameter of 5 nm, were obtained. Grain growth and an increase in size distribution was observed for higher concentrations. The occurrence of surface plasmon resonance (SPR) bands and their evolution in the size range 5-10 nm is studied. For decreasing nanoparticle size, a redshift and broadening of the plasmon-related absorption peak was observed. The observed redshift and broadening of the SPR band was explained using modified Mie scattering theory.
机译：通过使用原硅酸四乙酯（TEOS）和硝酸银（AgNO3）的溶胶-凝胶技术获得二氧化硅纳米银复合材料。改变硝酸银的浓度以获得具有不同纳米颗粒尺寸的复合材料。通过X射线衍射（XRD），傅立叶变换红外光谱（FTIR）和透射电子显微镜（TEM）确定结构和微观结构性质。进行了X射线光电子能谱（XPS）研究，以确定二氧化硅在基质中的化学状态。对于最低的AgNO3浓度，获得了平均直径为5 nm的单分散球形Ag微晶。对于更高的浓度，观察到晶粒长大和尺寸分布增加。研究了表面等离振子共振（SPR）带的发生及其在5-10 nm尺寸范围内的演化。为了减小纳米颗粒尺寸，观察到了红移和等离子体激元相关的吸收峰变宽。使用改进的Mie散射理论解释了观察到的SPR谱带的红移和展宽。

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