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首页> 外文期刊>Nanotechnology >Silver nanoparticles on titanate nanobelts via the self-assembly of weak polyelectrolytes: Synthesis and photocatalytic properties
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Silver nanoparticles on titanate nanobelts via the self-assembly of weak polyelectrolytes: Synthesis and photocatalytic properties

机译：通过弱聚电解质的自组装在钛酸酯纳米带上的银纳米颗粒：合成和光催化性能

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A weak-polyelectrolyte multilayer on a surface of titanate nanobelts (Ti-NBs) was utilized as a template for in situ Ag nanoparticle formation in the fabrication of Ag-loaded Ti-NBs nanocomposites. The polyelectrolyte multilayer (PEM) was fabricated using layer-by-layer self-assembly of poly(acrylic acid) (PAA) and poly(allylamine hydrochloride) (PAH) on the surface of high-surface-area titanate nanobelts (Ti-NBs) synthesized using a hydrothermal procedure. The concentration of Ag nanoparticles in the PEM was controlled by repeating the ion-loading/reduction cycle. The subsequent annealing of the Ag/Ti-NBs-PEM nanocomposites yielded nanostructured crystalline Ag/Ti-NBs. Transmission electron microscopy (TEM) techniques (HRTEM, SAED) and x-ray powder diffraction (XRD) were employed to evaluate the morphological, structural and growth characteristics of the silver nanocrystallites in the Ag/Ti-NBs nanocomposites. The UV-vis photoactivity of the as-fabricated nanocomposites was monitored by the degradation of the cationic dye methylene blue (MB). An enhanced UV photo-efficiency was observed for the Ag/Ti-NBs nanocomposites compared with pure Ti-NBs. As-fabricated Ag(χ)/Ti-NBs nanocomposites also exhibited visible photoactivity assisted by the near-field amplitudes of the localized surface plasmon resonance (LSPR) of the silver nanoparticles in the 1D nanocomposite.
机译：钛酸盐纳米带（Ti-NBs）表面上的弱聚电解质多层被用作模板，用于在载有Ag的Ti-NBs纳米复合材料的制备中原位形成Ag纳米颗粒。在高表面积钛酸酯纳米带（Ti-NBs）的表面上使用聚丙烯酸（PAA）和聚烯丙胺盐酸盐（PAH）进行逐层自组装，制备了聚电解质多层（PEM） ）使用水热法合成。通过重复离子加载/还原循环来控制PEM中Ag纳米颗粒的浓度。 Ag / Ti-NBs-PEM纳米复合材料的随后退火产生了纳米结构的晶体Ag / Ti-NBs。透射电子显微镜（TEM）技术（HRTEM，SAED）和X射线粉末衍射（XRD）用于评估Ag / Ti-NBs纳米复合材料中银纳米微晶的形态，结构和生长特性。通过阳离子染料亚甲基蓝（MB）的降解监测制备的纳米复合材料的紫外可见光活性。与纯Ti-NBs相比，Ag / Ti-NBs纳米复合材料观察到增强的UV光效率。一维纳米复合材料中，银纳米粒子的局域表面等离振子共振（LSPR）的近场幅度辅助了所制造的Ag（χ）/ Ti-NBs纳米复合材料。

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