Doh Chang Lee (이도창)Associate Professor
Tel : +82-42-350-3937
Fax : +82-42-350-3910
E-mail : firstname.lastname@example.org
Homepage : http://dclee.kaist.ac.kr
- 2007 : Ph.D., University of Texas at Austin(Thesis Advisor: Prof. Brian Korgel)
- 2002 : M.S., Seoul National University(Thesis Advisor: Prof. Sang Heup Moon)
- 2000 : B.S., Seoul National University
Employment and Professional Experience
- 2010 : Postdoctoral Fellow, Los Alamos National Laboratory (Supervisor: Dr. Victor Klimov)
Awards and Honors
- Los Alamos National Laboratory Director’s Postdoctoral Fellowship
- Harrington Dissertation Fellowship
1. Doh C. Lee, Istvan Robel, Jeffrey M. Pietryga, Victor I. Klimov, “Infrared-Active Nanocrystals with Ultralong Carrier Lifetimes,” Journal of the American Chemical Society, 132, 9960-9962 (2010).
2. Doh C. Lee, Jeffrey M. Pietryga, Istvan Robel, Donald J. Werder, Richard D. Schaller, Victor I. Klimov, “Colloidal Synthesis of Infrared-Emitting Germanium Nanocrystals,” Journal of the American Chemical Society, 131, 3436-3437 (2009).
3. Doh C. Lee, Danielle K. Smith, Andrew T. Heitsch, Brian A. Korgel, “Colloidal magnetic nanocrystals: synthesis, properties and applications,” Annual Reports on the Progress of Chemistry, Section C: Physical Chemistry, 103, 351-401 (2007).
4. Doh C. Lee, Ali Ghezelbash, Cynthia A. Stowell, Brian A. Korgel, “Synthesis and Magnetic Properties of Colloidal MnPt3 Nanocrystals,” Journal of Physical Chemistry B, 110, 26906-26911 (2006).
5. Doh C. Lee, Frederic V. Mikulec, José M. Pelaez, Bonil Koo, Brian A. Korgel, “Synthesis and Magnetic Properties of Silica-Coated FePt Nanocrystals” Journal of Physical Chemistry B, 110, 11160-11166 (2006).
6. Yoonjung Bae, Doh C. Lee, Elena Rogojina, David Jurbergs, Brian A. Korgel, Allen J. Bard, “Electrochemistry and Electrogenerated Chemiluminescence of Films of Silicon Nanoparticles in Aqueous Solution,” Nanotechnology, 17, 3791-3797 (2006).
7. Doh C. Lee, Tobias Hanrath, Brian A. Korgel, “The Role of Precursor-Decomposition Kinetics in Silicon Nanowire Synthesis in Organic Solvents,” Angewandte Chemie International Edition, 44, 3573-3577 (2005).
8. Doh C. Lee, Brian A. Korgel, “Metal nanocrystal–seeded synthesis of carbon nanotubes and nanofibers in a supercritical fluid,” Molecular Simulation, 31, 637-642 (2005).
9. Doh C. Lee, Frederic V. Mikulec, Brian A. Korgel, “Carbon nanotube synthesis in supercritical toluene,” Journal of the American Chemical Society, 126, 4951-4957 (2004).
10. Doh Chang Lee, Jae Hyung Kim, Woo Jae Kim, Jung Hwa Kang, Sang Heup Moon, “Selective Hydrogenation of 1,3-Butadiene on TiO2-modified Pd/SiO2 Catalysts,” Applied Catalysis A, 244(1), 83-91 (2003).
Electronic Nanomaterials & Devices Laboratory
Synthesis and characterization of quantum dots and carbon Nanomaterials, Design and fabrication of ultracapacitors/photodetectors/photocatalysts based on colloidal nanocrystals
The research focus of our group centers on (1) synthesis and characterization of quantum dot/grapheme hybrid nanomaterials, (2) photocatalysis of metal/semiconductor heterostructure nanocrystals, (3) spintronic devices, and (4) design and fabrication of ultracapacitors based on colloidal nanocrystals and nanowires.
- Synthesis and Characterization of Quantum Dot/Graphene Hybrid Nanomaterials
The presence of organic ligands controls the size of the crystals and prevents surfaces from undergoing unwanted reactions. This approach has provided a unique solution to precise control over nanocrystal size and shapes in a colloidal phase. The versatility of the synthesis sparked research interest in the study of the size-dependent properties of colloidal inorganic nanocrystals. For instance, the energy gap (or optical gap) of semiconductor nanocrystals is size-tunable as a result of quantum confinement.
Despite the outstanding control of their structural and optical properties, the use of the nanocrystals in electronic devices has remained elusive, as the organic ligands generally make the nanocrystal film insulating. One way to address the problem is to replace the organic ligands with graphitic carbon materials. In this study, we synthesize nanometer-scale graphenes colloidally and use them as a passivation layer for the nanocrystals. The novel hybrid structures with improved conductivity ensure the use of the materials in a range of device applications, such as photodetectors, photodiodes, photovoltaics, and spintronics.
- Photocatalysis of Metal/Semiconductor Heterostructure Nanocrystals
A relatively new trend in the colloidal nanocrystals field is the synthesis of heterostructure nanomaterials comprising various functional components. The heterostructure architecture enables the fine-tuning of optical and electrical properties. This motif has been utilized for producing new emergent properties arising from strong interactions between different components located in the nanoscale proximity from each other. Control of the dimension of each component permits the comprehensive engineering of electronic energy state configuration within the nanoscale architecture.
Our group studies the metal/semiconductor heterostructure nanocrystals and their use in photocatalytic reactions. To have a better understanding of how we can improve catalytic activity and selectivity of the metal components, we investigate the charge transfer, charge carrier dynamics, and electron-hole separation within the heterostructure nanocrystals.
- Spin Coherence Control in Magnet/Semiconductor Hybrid Nanocrystals
- Ultracapacitors based on Colloidal Nanocrystals and Nanowires
In the pursuit of high-quantity synthetic routes, our group employs the solution-based growth of nanocrystals and nanowires.