Surface control of CdSe nanocrystals by UV-exposure in air and successive thermal treatment under ultra high vacuum
- Authors
- Choi, Hyun-Ju; Wang, Seok-Joo; Kim, Hyuncheol; Park, Hyung-Ho; Chang, Ho Jung; Jeon, Hyeongtag
- Issue Date
- Aug-2008
- Publisher
- ELSEVIER
- Keywords
- CdSe nanocrystals; electronic structure; UV treatment; thermal treatment
- Citation
- APPLIED SURFACE SCIENCE, v.254, no.21, pp.6886 - 6889
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 254
- Number
- 21
- Start Page
- 6886
- End Page
- 6889
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/171932
- DOI
- 10.1016/j.apsusc.2008.04.090
- ISSN
- 0169-4332
- Abstract
- Colloidal CdSe nanocrystals were synthesized through a solution process. The CdSe nanocrystals coated on Si(1 0 0) wafers were UV-exposed in either an air or argon atmosphere to distinguish the effect of generated ozone from UV-radiation at 365 nm on the removal of surface capping pyridine molecules. The pyridine on the CdSe nanocrystal's surface could be effectively removed by the ozone generated during UV-exposure with an accompanying highly oxidized surface state of the CdSe nanocrystals. For the removal of surface oxides of CdSe nanocrystals, a successive thermal treatment under ultra high vacuum (UHV) was adopted. The optical energy bandgap measured by using UV-vis absorption spectroscopy showed a red shift with treatment with an increase of annealing temperature. The electronic energy structure of UHV-annealed CdSe nanocrystals film was analyzed in situ using X-ray absorption and photoelectron spectroscopy. A great resemblance was found between the values of the optical and electron energy bandgaps of effectively surface-treated CdSe nanocrystals film after UHV-annealing at 400 degrees C.
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