Manipulation of gold nanoparticles inside transparent materials
Manipulation of gold nanoparticles inside transparent materials
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DOI：
10.1002/anie.200352380
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发表时间：
2004-04-19
影响因子：
16.6
通讯作者：
Hirao, K
中科院分区：
文献类型：
--
作者：
Qiu, JR;Jiang, XW;Hirao, K
由于纳米结构的量子尺寸效应、表面效应和结合效应，纳米粒子具有广泛的电学和光学性质。[1]掺杂贵金属纳米粒子的材料具有很大的三阶非线性极化率和超快的非线性响应。[2]它们有望成为THz波段超快全光开关的理想材料。对于与集成光电子学相关的应用，纳米颗粒在材料中的良好定义的组装和空间分布是必不可少的。[3]人们已经对纳米粒子掺杂材料的制备进行了许多研究[4]，但没有有效的方法来控制纳米粒子在这些材料中的空间分布。此外，Zheng和Dickson报道了通过在环境条件下直接光还原银离子来合成光稳定的、水溶性的银纳米点。[5]还从单个银纳米团簇中观察到光活化荧光。[6]在此，我们报告了一种方法，可以控制沉淀的Au纳米粒子在三维透明材料内，通过使用聚焦飞秒激光照射。简而言之，沉淀过程包括两个过程：多光子过程诱导的Au离子光还原成原子和热处理驱动的Au粒子沉淀。纳米颗粒的尺寸和它们的空间分布可以通过激光照射的条件来控制。有趣的是，通过这种技术获得的沉淀纳米粒子也可以通过飞秒激光照射空间选择性地“溶解”，并通过退火再沉淀。这意味着该激光器不仅可以用于实际应用，如3D光存储器和集成全光开关的制造，而且还可以用于控制成核和晶体生长的研究。
Nanoparticles have a wide range of electrical and optical properties owing to the quantum-size effect, surface effect, and conjoint effect of nanostructures.[1] Materials doped with noble-metal nanoparticles exhibit large third-order nonlinear susceptibility and ultrafast nonlinear responses.[2] They are expected to be promising materials for ultrafast all-optical switches in the THz region. For the applications related to integrated optoelectronics, a well-defined assembly and spatial distribution of nanoparticles in materials are essential.[3] Many studies have been carried out on the fabrication of nanoparticle-doped materials,[4] but there are no effective methods to control the spatial distribution of nanoparticles in these materials. In addition, Zheng and Dickson reported the synthesis of photostable, water-soluble, silver nanodots by direct photoreduction of silver ions under ambient conditions.[5] Photoactivated fluorescence has also been observed from individual silver nanoclusters.[6] Herein, we report a method that can control the precipitation of Au nanoparticles in three dimensions inside transparent materials by using focused femtosecond laser irradiation. In brief, the precipitation involves two processes: the photoreduction of Au ions to atoms induced by multiphoton process, and the precipitation of Au particles driven by heat treatment. The size of nanoparticles and their spatial distribution can be controlled by the conditions of the laser irradiation. Interestingly, the precipitated nanoparticles obtained by this technique can be also space-selectively “dissolved” by the femtosecond laser irradiation, and reprecipitated by annealing. This implies that the laser can be used not only in practical applications, such as the 3D optical memory and the fabrication of integrated alloptical switches, but also in the study of the control of nucleation and crystal growth.