Synthesis of Al-Catalyzed Si Nanowires Using the Al Remaining After Removal of Anodic Aluminum Oxide
- Aug 16, 2023
- 1 min read
Jin-Young Jung, Sang-Won Jee, Kwang-Tae Park, and Jung-Ho Lee∗
Abstract
Single-crystal, Al-catalyzed silicon nanowires were grown under atmospheric pressure using the dimpled feature of the Al metal that remained after removal of an anodic aluminum oxide (AAO) template directly formed on a Si substrate. Upon nnealing in a hydrogen-rich atmosphere, the dimpled morphology of Al was transformed into a smooth, rounded shape in which Si nanodots were periodically embedded due to Si migration from the substrate. The positions of the nanodots were exactly the same as the positions of sawtooth features on the dimpled surface. Although Al-catalyzed silicon nanowires have been known to grow only under vacuum due to the tendency of Al to oxidize, these silicon nanodots, surrounded by residual Al, showed excellent resistance to oxidation under atmospheric pressure. These nanodots were also capable of acting as catalysts for the growth of nanowires, and played a role in determining the diameter of the nanowires. A thinner residual Al layer made it easier to form Si nanodots while reducing the size of the nanodots, which subsequently led to the growth of nanowires with smaller diameters and better crystalline morphology.
The innovative approach of using residual Al from anodic aluminum oxide to catalyze Si nanowire growth is quite fascinating. The transformation of the dimpled Al morphology into smooth structures while enabling effective Si dot formation opens new avenues for nanotechnology. It's interesting how this method allows for atmospheric pressure synthesis, which could lead to more accessible applications in various fields. For those working on experiments that require precision in measurements, utilizing a significant figures calculator like Significant Figures Calculator can be incredibly helpful in ensuring accuracy throughout the process.