期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 9, 期 2, 页码 274-280出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b03305
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资金
- Ministry of Science and Technology [2016YFA0200700]
- Natural Science Foundation of China [21473243, 21625304]
Active control of nanocrystal optical and electrical properties is crucial for many of their applications. By electrochemical (de)lithiation of Cu2-xSe, a highly doped semiconductor, dynamic and reversible manipulation of its NIR plasmonics has been achieved. Spectroelectrochemistry results show that NIR plasmon red-shifted and reduced in intensity during lithiation, which can be reversed with perfect on-off switching over 100 cycles. Electrochemical impedance spectroscopy reveals that a Faradaic redox process during Cu2-xSe (de)lithiation is responsible for the optical modulation, rather than simple capacitive charging. XPS analysis identifies a reversible change in the redox state of selenide anion but not copper cation, consistent with DFT calculations. Our findings open up new possibilities for dynamical manipulation of vacancy-induced surface plasmon resonances and have important implications for their use in NIR optical switching and functional circuits.
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