Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China. ychai@ polyu.edu.hk.
Nanoscale. 2015 Aug 28;7(32):13420-6. doi: 10.1039/c5nr02611c. Epub 2015 Jul 27.
Ag nanostructures are widely used in catalysis, energy conversion and chemical sensing. Morphology-tailored synthesis of Ag nanostructures is critical to tune physical and chemical properties. In this study, we develop a method for synthesizing the morphology-tailored Ag nanostructures in aqueous solution at a low temperature (45 °C). With the use of AgCl nanoparticles as the precursor, the growth kinetics of Ag nanostructures can be tuned with the pH value of solution and the concentration of Pd cubes which catalyze the reaction. Ascorbic acid and cetylpyridinium chloride are used as the mild reducing agent and capping agent in aqueous solution, respectively. High-yield Ag nanocubes, nanowires, right triangular bipyramids/cubes with twinned boundaries, and decahedra are successfully produced. Our method opens up a new environmentally-friendly and economical route to synthesize large-scale and morphology-tailored Ag nanostructures, which is significant to the controllable fabrication of Ag nanostructures and fundamental understanding of the growth kinetics.
Ag 纳米结构在催化、能量转换和化学传感等领域得到了广泛应用。形貌可控的 Ag 纳米结构合成对于调节其物理和化学性质至关重要。在本研究中，我们开发了一种在低温（45°C）下在水溶液中合成形貌可控 Ag 纳米结构的方法。以 AgCl 纳米颗粒为前驱体，通过调节溶液的 pH 值和催化反应的 Pd 立方体的浓度，可以调控 Ag 纳米结构的生长动力学。抗坏血酸和十六烷基吡啶盐酸盐分别用作水溶液中的温和还原剂和稳定剂。成功制备了高产率的 Ag 纳米立方体、纳米线、具有孪晶边界的正三角双锥/立方体和十面体。我们的方法为大规模合成形貌可控的 Ag 纳米结构开辟了一条环保且经济的新途径，这对于 Ag 纳米结构的可控制备和生长动力学的深入理解具有重要意义。
