1. Department of Mechanical Engineering, BK21FOUR ERICA-ACE Center, Hanyang University, Ansan, Gyeonggi 15588, Republic of Korea.
2. Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.
3. National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
4. Integrated Dynamic Electron Solutions Inc., Pleasanton, CA 94588, USA.
5. Department of Physics, University of California, Berkeley, CA 94720, USA.
6. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
7. Kavli Energy NanoSciences Institute, Berkeley, CA 94720, USA.
8. School of Chemical and Biological Engineering and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea.
9. Center for Nanoparticle Research, Institute for Basic Science, Seoul 08826, Republic of Korea.