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首页> 外文期刊>Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology >Size-controlled synthesis of silver nanoparticles on Ti-containing mesoporous silica thin film and photoluminescence enhancement of rhodamine 6G dyes by surface plasmon resonance
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Size-controlled synthesis of silver nanoparticles on Ti-containing mesoporous silica thin film and photoluminescence enhancement of rhodamine 6G dyes by surface plasmon resonance

机译：含钛介孔二氧化硅薄膜上银纳米粒子的尺寸控制合成和表面等离振子共振增强罗丹明6G染料的光致发光

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摘要

Silver nanoparticles having a narrow size distribution were synthesized on Ti-containing mesoporous silica thin film (Ti-MSTF) using a simple photo-assisted deposition (PAD) method. Their particle sizes were successfully controlled by changing the photo-irradiation time during the deposition and average particle sizes at irradiation times of 1, 5 and 24 h were determined to be 2.7, 4.7 and 7.6 nm, respectively. The XPS depth profile analysis indicated that silver nanoparticles mainly exist not on the surface but in the thin film. UV-vis absorption spectra of these films showed an absorption band in the visible-wavelength region attributed to the surface plasmon resonance of silver nanoparticles. Rhodamine 6G (R6G) dye molecules were further embedded on Ti-MSTF after silver nanoparticle deposition. Photoluminescence properties of R6G dyes on these thin films were enhanced due to surface plasmon excitation from silver nanoparticles and the photoluminescence intensity reached up to 3 times as high as that achieved without silver nanoparticles. It was proven that the silver nanoparticle size had a strong influence on these enhancement effects.
机译：使用简单的光辅助沉积（PAD）方法，在含Ti的介孔二氧化硅薄膜（Ti-MSTF）上合成了具有窄尺寸分布的银纳米颗粒。通过改变沉积过程中的光照射时间成功地控制了它们的粒径，并且在1、5和24小时的照射时间下的平均粒径分别确定为2.7、4.7和7.6 nm。 XPS深度剖面分析表明，银纳米颗粒主要不存在于表面，而是存在于薄膜中。这些膜的UV-vis吸收光谱显示出在可见波长区域中的吸收带，这归因于银纳米颗粒的表面等离子体激元共振。银纳米粒子沉积后，若丹明6G（R6G）染料分子进一步嵌入到Ti-MSTF中。这些薄膜上的R6G染料的光致发光特性由于银纳米颗粒的表面等离激元激发而得到增强，其光致发光强度高达不使用银纳米颗粒时的3倍。业已证明，银纳米颗粒的尺寸对这些增强作用有很大的影响。

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