Details
| Original language | English |
|---|---|
| Pages (from-to) | 11175-11180 |
| Number of pages | 6 |
| Journal | Journal of the American Chemical Society |
| Volume | 133 |
| Issue number | 29 |
| Publication status | Published - 6 Jul 2011 |
| Externally published | Yes |
Abstract
We demonstrate that colloidal Cu2 - xSe nanocrystals exhibit a well-defined infrared absorption band due to the excitation of positive charge carrier oscillations (i.e., a valence band plasmon mode), which can be tuned reversibly in width and position by varying the copper stoichiometry. The value of x could be incrementally varied from 0 (no plasmon absorption, then a broad peak at 1700 nm) to 0.4 (narrow plasmon band at 1100 nm) by oxidizing Cu 2Se nanocrystals (upon exposure either to oxygen or to a Ce(IV) complex), and it could be incrementally restored back to zero by the addition of a Cu(I) complex. The experimentally observed plasmonic behavior is in good agreement with calculations based on the electrostatic approximation.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
- General Chemistry
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry
- Chemical Engineering(all)
- Colloid and Surface Chemistry
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Journal of the American Chemical Society, Vol. 133, No. 29, 06.07.2011, p. 11175-11180.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Reversible Tunability of the Near-Infrared Valence Band Plasmon Resonance in Cu2- xSe Nanocrystal
AU - Dorfs, Dirk
AU - Härtling, Thomas
AU - Miszta, Karol
AU - Bigall, Nadja C.
AU - Kim, Mee Rahn
AU - Genovese, Alessandro
AU - Falqui, Andrea
AU - Povia, Mauro
AU - Manna, Liberato
PY - 2011/7/6
Y1 - 2011/7/6
N2 - We demonstrate that colloidal Cu2 - xSe nanocrystals exhibit a well-defined infrared absorption band due to the excitation of positive charge carrier oscillations (i.e., a valence band plasmon mode), which can be tuned reversibly in width and position by varying the copper stoichiometry. The value of x could be incrementally varied from 0 (no plasmon absorption, then a broad peak at 1700 nm) to 0.4 (narrow plasmon band at 1100 nm) by oxidizing Cu 2Se nanocrystals (upon exposure either to oxygen or to a Ce(IV) complex), and it could be incrementally restored back to zero by the addition of a Cu(I) complex. The experimentally observed plasmonic behavior is in good agreement with calculations based on the electrostatic approximation.
AB - We demonstrate that colloidal Cu2 - xSe nanocrystals exhibit a well-defined infrared absorption band due to the excitation of positive charge carrier oscillations (i.e., a valence band plasmon mode), which can be tuned reversibly in width and position by varying the copper stoichiometry. The value of x could be incrementally varied from 0 (no plasmon absorption, then a broad peak at 1700 nm) to 0.4 (narrow plasmon band at 1100 nm) by oxidizing Cu 2Se nanocrystals (upon exposure either to oxygen or to a Ce(IV) complex), and it could be incrementally restored back to zero by the addition of a Cu(I) complex. The experimentally observed plasmonic behavior is in good agreement with calculations based on the electrostatic approximation.
UR - http://www.scopus.com/inward/record.url?scp=79960596606&partnerID=8YFLogxK
U2 - 10.1021/ja2016284
DO - 10.1021/ja2016284
M3 - Article
AN - SCOPUS:79960596606
VL - 133
SP - 11175
EP - 11180
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 29
ER -