Scientists Watch Nanowires as They Grow
For wire production, the scientists used the self-catalyzed vapor-
liquid-solid process (VLS process). Minute liquid gallium droplets are deposited on a hot silicon crystal of around 600°C in temperature. Then, this wafer is subjected to directed beams of gallium atoms and arsenic molecules that dissolve in the gallium droplets. After some time, nanowires start to grow below the droplets that act as catalysts for the longitudinal growth of the wires. “This process is quite well established, but it has been impossible so far to specifically control it. To achieve this, the details of growth have to be understood first,” co-author Ludwig Feigl of KIT says.
For the studies, the team used a portable chamber specifically designed by KIT’s Institute for Photon Science and Synchrotron Radiation (IPS) with funds of the Federal Ministry of Education and Research (BMBF). The researchers installed the chamber in the research light source PETRA III of the German Electron Synchrotron (DESY) and took X-ray pictures every minute to determine the structure and diameter of the growing nanowires. Finally, they measured the fully grown nanowires with an electron microscope.
Karlsruhe Institute of Technology (KIT)
Radial Growth of Self-Catalyzed GaAs Nanowires and the Evolution of the Liquid Ga-Droplet Studied by Time-Resolved in situ X‐ray Diffraction; Philipp Schroth, Julian Jakob, Ludwig Feigl, Seyed Mohammad Mostafavi Kashani, Jonas Vogel, Jörg Strempfer, Thomas F. Keller, Ullrich Pietsch, and Tilo Baumbach; „Nano Letters“, 2018; DOI: 10.1021/acs.nanolett.7b03486
Source: http://www.ineffableisland.com/2018/03/scientists-watch-nanowires-as-they-grow.html
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