Reversible tunability of the near-infrared valence band plasmon resonance in Cu2- xSe nanocrystals

Dirk Dorfs; Thomas Härtling; Karol Miszta; Nadja C. Bigall; Mee Rahn Kim; Alessandro Genovese; Andrea Falqui; Mauro Povia; Liberato Manna

doi:10.1021/ja2016284

Reversible tunability of the near-infrared valence band plasmon resonance in Cu_{2- x}Se nanocrystals

Dirk Dorfs, Thomas Härtling, Karol Miszta, Nadja C. Bigall, Mee Rahn Kim, Alessandro Genovese, Andrea Falqui, Mauro Povia, Liberato Manna^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

419 Scopus citations

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 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.

Original language	English (US)
Pages (from-to)	11175-11180
Number of pages	6
Journal	Journal of the American Chemical Society
Volume	133
Issue number	29
DOIs	https://doi.org/10.1021/ja2016284
State	Published - Jul 27 2011
Externally published	Yes

ASJC Scopus subject areas

Catalysis
General Chemistry
Biochemistry
Colloid and Surface Chemistry

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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.",

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T1 - Reversible tunability of the near-infrared valence band plasmon resonance in Cu2- xSe nanocrystals

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 - 2011/7/27

Y1 - 2011/7/27

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.

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Reversible tunability of the near-infrared valence band plasmon resonance in Cu_{2- x}Se nanocrystals

Abstract

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