Reversible Tunability of the Near-Infrared Valence Band Plasmon Resonance in Cu2-xSe Nanocrystals

被引：417

作者：

Dorfs, Dirk ^{[1
]}

Haertling, Thomas ^{[2
]}

Miszta, Karol ^{[1
]}

Bigall, Nadja C. ^{[1
]}

Kim, Mee Rahn ^{[1
]}

Genovese, Alessandro ^{[1
]}

Falqui, Andrea ^{[1
]}

Povia, Mauro ^{[1
]}

Manna, Liberato ^{[1
]}

机构：

[1] Ist Italian Tecnol, I-16163 Genoa, Italy

[2] Fraunhofer Inst Nondestruct Testing, Dresden Branch, D-01109 Dresden, Germany

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 29期

关键词：

COPPER SELENIDE; FLUORESCENCE ENHANCEMENT; OPTICAL-PROPERTIES; NANOPARTICLES; SHAPE; SIZE; DEPENDENCE;

D O I：

10.1021/ja2016284

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 Cu2Se 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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收藏

页码：11175 / 11180

页数：6

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