金属纳米结构的物理和化学性质强烈依赖于其形貌（如：球形或非球形，空心或实心等）。近年来，制备形貌可控的金属纳米结构已成为纳米材料研究的热点。本研究小组采取苯胺热还原经无机酸、碱调制的HAuCl4水溶液的新的合成策略，无模板、无吸附剂或表面活性剂的辅助，高产量、可控地制备了三角形、六边形、截角三角形的单晶片、网络状的线、海绵状的颗粒聚集体、珊瑚状分支的单晶片等多种金纳米结构。所获的非球形的金纳米结构呈现了强烈的形貌相关的光学性质并在近红外区具有显著的吸收, 从而有望在肿瘤热疗以及红外吸收光学涂层领域获得应用。
The physicochemical properties of metallic nanostructures heavily depend on their shapes (e.g. spherical versus nonspherical and solid versus hollow). In recent years, shape-controlled preparation of metallic nanostructures has become a hot research area. Herein we developed a novel but facile approach for controllable synthesis of anisotropic gold nanostructures, such as single-crystal nanoplates with triangular, hexagonal or truncated triangular shapes, networked nanowires，spongy-like aggregates and single-crystal coral-like plates, through the aniline reduction of inorganic acid or base mediated HAuCl4 aqueous solutions without the need for additional templates or capping agents. These anisotropic gold nanostructures present strongly shape-dependent optical properties as well as intense absorption in the NIR region, which holds potential applications in cancer hyperthermia and IR-absorbing optical coatings.
Fig.1 Typical TEM images of the obtained gold nanostructures: (a) single-crystal plates with triangular, hexagonal or truncated triangular shapes, (b) networked wires, (c) spongy-like aggregates of particles and (d) coral-like single-crystal plates.
Zhirui Guo, Yu Zhang, Lan Huang, Meng Wang, Jing Wang, Jianfei Sun, Lina Xu, Ning Gu, One-step controlled synthesis of anisotropic gold nanostructures with aniline as the reductant in aqueous solution，Journal of Colloid and Interface Science, 2007, 309: 518-523.
