Dahl Gregor Thomas, Krueger Jan-Dominik, Döring Sebastian, Weller Horst, Vossmeyer Tobias
Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany.
Fraunhofer Center for Applied Nanotechnology CAN, Grindelallee 117, 20146 Hamburg, Germany.
Nanomaterials (Basel). 2020 Jun 19;10(6):1197. doi: 10.3390/nano10061197.
Metal-ceramic composite particles are of increasing interest due to their potential applications in photonic metamaterials as well as next-generation catalysts. The zirconia-gold system has received little attention due to the lack of controllable preparation methods. Well-known methods for the deposition of gold nanoshells on silica spheres, however, should be adaptable for similar zirconia-based materials. Here, we present a novel synthetic approach to the well-controlled deposition of gold on the surface of sol-gel derived zirconia mesoparticles by a stepwise method involving the immobilization of gold nanoparticles and repeated seeded-growth steps. We show that the immobilization efficiency is strongly enhanced by acidification with hydrochloric acid and additional employment of aminomethylphosphonic acid as coupling agent. The optimum conditions are identified and the subsequent incremental growth by seeded reduction of gold is demonstrated. The results shed light on the parameters governing the preparation of zirconia@gold composite particles and our synthetic approach provides a promising tool for future developments in complex nanomaterials design.
金属陶瓷复合颗粒因其在光子超材料以及下一代催化剂中的潜在应用而越来越受到关注。由于缺乏可控的制备方法，氧化锆-金体系很少受到关注。然而，在二氧化硅球上沉积金纳米壳的知名方法应该适用于类似的氧化锆基材料。在这里，我们提出了一种新颖的合成方法，通过逐步方法将金可控地沉积在溶胶-凝胶衍生的氧化锆介孔颗粒表面，该方法包括固定金纳米颗粒和重复的种子生长步骤。我们表明，通过用盐酸酸化并额外使用氨基甲基膦酸作为偶联剂，固定效率得到了显著提高。确定了最佳条件，并展示了通过金的种子还原进行的后续增量生长。这些结果揭示了控制氧化锆@金复合颗粒制备的参数，我们的合成方法为复杂纳米材料设计的未来发展提供了一个有前景的工具。
