Unusually-high growth rate (～2.8 μm/s) of germania nanowires and its hierarchical structures by an in-situ continuous precursor supply

作者：Wu, Shaoteng^*; Chen, Qimiao; Zhang, Lin; Dian, Lim Yu; Zhou, Hao; Tan, Chuan Seng^*

来源：Ceramics International, 2023, 49(5): 7180-7186.

DOI：10.1016/j.ceramint.2021.11.245

• Semiconductor nanowire
• CeO2
• Ultra-fast
• In-situ precursor supply
• Hierarchical structure

Low-dimensional nanostructured semiconductors are becoming the promising materials for high-performance nanophotonics, nanoelectronics, and quantum devices. To enable these applications, it requires an efficient methodology to control the dimension of these materials during synthesis processes, and to achieve mass pro-duction of these materials with high reproducibility, perfect crystallinity, and low production cost. In this study, an ultra-fast, facile synthesis strategy is presented for reproducible monocrystalline hexagonal germania (GeO2) nanowires (NWs) and hierarchical structures. These GeO2 nanostructures were grown by one-step-annealing of the Ni film-covered GeSn epilayers in a rapid thermal annealing (RTA) system without any gaseous or liquid Ge sources. It was found that after short annealing for 60 s at 675 degrees C, the long GeO2 NWs of more than 170 mu m are obtained, indicating that the growth rate is several magnitude orders higher than that of the common chemical vapor deposition (CVD) methods. The mechanism of the growth was studied by changing the growth tempera-ture, catalyst type, and surface oxidation. The results indicate that this record-fast growth (>2.8 mu m/s) of NW is due to the continuously generated in-situ GeO vapors from the Ni-catalyst decomposition of supersaturated GeSn epilayer. This work presents a rapid, and low-cost method to synthesis high-density GeO2 NW and its hierarchical structures which have the potential applications for optoelectronic communication/detection, superhydrophobic surfaces, photocatalyst, and sensing.

• 单位
  中国科学院