Reversible Tunability of the Near-Infrared Valence Band Plasmon Resonance in Cu2–xSe Nanocrystals
Journal of the American Chemical Society2011Vol. 133(29), pp. 11175–11180
Citations Over TimeTop 1% of 2011 papers
Dirk Dorfs, Thomas Härtling, Karol Miszta, Nadja C. Bigall, Mee Rahn Kim, Alessandro Genovese, Andrea Falqui, Mauro Povia, Liberato Manna
Abstract
We demonstrate that colloidal Cu(2-x)Se 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(2)Se 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.
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