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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Silver-Coated Polydiacetylene Nanocrystals Fabricated Using Surfactants as Binder
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Silver-Coated Polydiacetylene Nanocrystals Fabricated Using Surfactants as Binder

机译：表面活性剂作为粘结剂制备的银包覆聚二乙炔纳米晶体

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摘要

A method of fabricating polydiacetylene (PDA) nanocrystals covered with silver nanoparticles was established using surfactant as a binder between the PDA core and silver nanoparticles, and the linear optical properties were examined in relation with their structure. Noble metal-coated PDA nanocrystals are expected to enlarge effective third-order nonlinear optical susceptibility χ~((3)), due to the enhancement of the optical electric field induced by localized surface plasmon. The well-defined PDA nanocrystal cores were first prepared by the conventional reprecipitation method. The following two-step reduction, namely, seed deposition and seed growth, enabled higher silver coverage on the surface of PDA nanocrystals. In particular, silver deposition succeeded by employing an anionic surfactant, because of electrostatic attraction with silver cations. It was also important to optimize concentration and the affinity of surfactant for PDA. The extinction spectra of the PDA nanocrystals covered with silver exhibited a strong localized surface plasmon peak of silver, distinct from the already-reported inverse core-shell-type structure, which would contribute to efficient enhancement of χ~((3)).
机译：使用表面活性剂作为PDA核心和银纳米颗粒之间的粘合剂，建立了一种被银纳米颗粒覆盖的聚二乙炔（PDA）纳米晶体的制备方法，并研究了线性光学性质及其结构。涂覆贵金属的PDA纳米晶体由于局部表面等离子体激元引起的光电场的增强，有望扩大有效的三阶非线性光学磁化率χ〜（（3））。首先通过常规的再沉淀方法制备轮廓分明的PDA纳米晶体核。接下来的两步还原，即种子沉积和种子生长，使得PDA纳米晶体表面具有更高的银覆盖率。特别地，由于与银阳离子的静电吸引，通过使用阴离子表面活性剂成功地沉积了银。优化浓度和表面活性剂对PDA的亲和力也很重要。覆盖有银的PDA纳米晶体的消光光谱显示出强的局部银表面等离子体激元峰，这与已经报道的逆核-壳型结构不同，这将有助于有效地增强χ（（3））。

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