Current Research Topics

R&D programs in Prof. Yoon's group cover four major areas.

   Publications

Prof. Yoon's group has written about 291 international SCI(E) journals.

   Patents

Prof. Yoon's group has obtained 16 domestic patents and 3 international patents.

           

 

Current Research Topics

Our research interests are classified into four fields of TEM analysis, self-assembly of nanoparticles by phospholipid membrane, synthesis and application of magnetic materials and synthesis of Si NW and CNT. Among the essential fields in researches on materials, we have defined the formation mechanisms of specific materials and synthesized thin-film, molecules and cells through new methods based on fine structure analysis by TEM. And we have investigated the phenomena and property changes on magnetic thin film interfaces and increased lifetime and capacity of materials (cathode, anode) on lithium ion battery trough the structure analysis by TEM. Property improvements of these materials and techniques on casual analysis have been conducted by TEM, AES, XPS and photon accelerator (Pohang, Japan Tsukuba) so far. By the way, as the size of materials goes nano-scale, TEM has been one of the most essential tools for fine structure analysis. Therefore, we have focused on research and training of TEM. Furthermore, as we analyze atom distributions and chemical bonds of materials for electrodes and thin-film using AES and XPS, we have gained the information not easy to be gained by TEM. In addition, as we have used beam line of photon accelerator for innovative approaches, we have suggested many approach methods on analysis of property and fine structure on advanced materials. On lipid membrane fields, we have demonstrated self?assembly of Ag nanoparticles by lipid membrane depending on temperature and humidity. Recently, observation on phase transitions of lipid membrane deposited Ag nanoparticles and formation of Ag nano string by phospholipid (DOPE) phase transitions have been conducted respectively. More recently, we have investigated coarsening behavior of Au nanoparticles depending on temperature and humidity in lipid membrane (DOTAP). These are expected to be applied to drug-delivery, bio-sensor and so on. Also we have studied about magnetocaloric effect of magnetic materials for magnetic refrigerator and synthesized magnetic random nanoparticle array for high density hard disk media. And we synthesized Si nanorod, SiOx nanowire and CNT by each different methods and they were applied to desalination, bio-sensor and fuel cell.

>> TEM analysis
- Structure analysis of materials(cathode, anode) on lithium ion battery
- Analysis and investigation of phenomena and property changes on magnetic thin film interfaces

>> Self-assembly of nanoparticles by Phospholipid membrane
- Self-assembly of Ag nanoparticles by Lipid membrane
- Observation on phase transitions of lipid membrane deposited Ag nanoparticles
- Formation of Ag nanostring by Phospholipid(DOPE) phase transitions depending on temperature and humidity
- Investigation on coarsening behavior of Au nanoparticles depending on temperature and humidity in lipid membrane(DOTAP)

>> Synthesis and application of magnetic materials
- Research on magnetocaloric effect of magnetic compounds for magnetic refrigerator
- Synthesis of magnetic random nanoparticle array for high density hard disk media

>> Synthesis of Si NW and CNT
- Formation of Si nanorod by chemical etching and application to biso sensor
- Synthesis of SiOx nanowire on Si substrate by polyimide
- Synthesis of CNT depending on Ni seeds size in CH4 and H2 atmosphere by PECVD