Optical properties of zinc oxide (ZnO) nanoparticles prepared in supercritical methanol and supercritical water were investigated. Interstitial zinc and oxygen vacancy were the major defects in the ZnO nanoparticles synthesized in supercritical methanol. The addition of oleic acid as a surface modifier resulted in the isolation of the nanoparticles and the removal of interstitial zinc. Lasing was observed with sharp longitudinal modes and a superlinear increase in the emission intensity of the ZnO nanowires synthesized in supercritical water. The band gap renormalization due to the electron-hole plasma induced a red-shift in the emission band, whereas the individual longitudinal modes were blue-shifted due to a change in refractive index.
Bibliographical noteFunding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2010-0012794). This work was also supported by the National Research Foundation of Korea Grant funded by the Korean Government (MEST, NRF-2009-C1AAA001-0 092 939). Additional support by Nano R&D program through the Korea Science and Engineering Foundation funded by the Ministry of Education, Science and Technology (2010-0019131) is appreciated.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry