Reversible tunability of the near-infrared valence band plasmon resonance in Cu(2-x)Se nanocrystals |
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Authors: | Dorfs Dirk Härtling Thomas Miszta Karol Bigall Nadja C Kim Mee Rahn Genovese Alessandro Falqui Andrea Povia Mauro Manna Liberato |
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Institution: | Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy. |
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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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