Silver-Coated Polydiacetylene Nanocrystals Fabricated Using Surfactants as Binder
Silver-Coated Polydiacetylene Nanocrystals Fabricated Using Surfactants as Binder
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DOI：
10.1143/jjap.45.379
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发表时间：
2006-01
影响因子：
1.5
通讯作者：
T. Onodera;Z. Tan;A. Masuhara;H. Oikawa;H. Kasai;H. Nakanishi;T. Sekiguchi
中科院分区：
文献类型：
--
作者：
T. Onodera;Z. Tan;A. Masuhara;H. Oikawa;H. Kasai;H. Nakanishi;T. Sekiguchi
建立了以表面活性剂为粘结剂，在聚二乙炔(PDA)核与银纳米粒子之间形成包覆银纳米粒子的方法，并考察了其线性光学性质与其结构的关系。由于局域表面等离子体激元诱导的光电场增强，贵金属包覆的PDA纳米晶有望放大有效的三阶非线性光学极化率χ(3)。首次采用传统的再沉淀法制备了结构清晰的PDA纳米晶核。随后的两步还原，即种子沉积和种子生长，使得银在PDA纳米晶的表面得到了更高的覆盖率。特别是，由于银离子对银离子的静电吸引，使用阴离子表面活性剂成功地沉积了银。优化表面活性剂对PDA的浓度和亲和力也很重要。与已报道的反核壳型结构不同，包银纳米晶的消光光谱显示出强烈的银表面等离子体激元峰，这将有助于有效地增强χ(3)。
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).