[Research Stories] prof. Hyun Jeong Shin (DOES of SKKU)
- 성균융합원
- Hit2440
- 2018-05-03
Successful synthesis of gold nanowires with a new crystalline structure with 60-degree rotation symmetry
Professor Shin Hyun-Jung of the Department of Energy Science (DOES) has grown gold nanowires with high aspect ratios within a limited structure of nanoscale, where new crystal structures, homomorphic (polymorph) ). Gold is known to be the most structurally stable material with platinum (Pt), and so far only face-centered cubic (fcc) structures have been reported. Polymorphism refers to those with the same chemical composition but different crystal structures. Control of homogeneity or more is very important in basic material science research because fine changes in crystal structure cause physical and chemical property changes including optical and electrical properties. Homogeneous abnormalities are also found in materials such as water and ice, diamonds and graphite that are commonly encountered in everyday life, and have been studied mainly in pharmacology to reduce side effects. However, little research has been done on precious metals such as gold, silver, platinum, and copper, and remains an unknown area.
In general, homogeneous anomalies are affected by the surrounding environment, such as temperature and pressure, and adopt the most thermodynamically stable structure, but Professor Shin Hyun-jung and colleagues note that even with constant temperature and pressure, the nanoscale limited structure forms a new metastable phase Which can be used to provide the environment to be This metastable phase was identified as a hexagonal non-close-packed structure with a 6-fold rotational symmetry using a transmission electron microscope. This structure has a larger interplanar distance than a hexagonal close-packed (hcp) structure and is very similar to a layered graphite. The hexagonal compact packing structure showed thermal stability corresponding to the existing face-centered cubic structure, and also showed a clear difference in optical characteristics.
Basic research in the field of materials science has made it possible to identify the mechanism of homogeneous anomalies in nanoscale, and it has a great significance in that it has laid a foundation for the development of new materials that go beyond the physical and chemical properties inherent to the material without changing the chemical composition.
This research, which was conducted mainly by professor Shin Hyun-jeong, researcher Lee Sunhee, and researcher Professor Bae Chang-gul of energy science, was selected as a cover paper for Advanced Materials (IF 19.791), a worldwide academic journal in material science. (2018.04.20) This research was supported by the Korea Research Foundation.