Designed Synthesis of Solid and Hollow Cu2鈥?i>xTe Nanocrystals with Tunable Near-Infrared Localized Surface Plasmon Resonance

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• 作者：Hong-Jie Yang ; Chia-Yu Chen ; Fang-Wei Yuan ; Hsing-Yu Tuan
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：October 24, 2013
• 年：2013
• 卷：117
• 期：42
• 页码：21955-21964
• 全文大小：597K
• 年卷期：v.117,no.42(October 24, 2013)
• ISSN：1932-7455

文摘

Solid and hollow structures of Cu_2鈥?i>xTe nanocrystals are synthesized by the injection of a Te鈥揟OP solution at different reaction times. Both types of Cu_2鈥?i>xTe nanocrystals exhibit an intense absorption peak (localized surface plasmon resonance (LSPR)) in the near-infrared region, arising from excess holes in the valence band, and high molar extinction coefficients of 2.6 脳 10⁷ M^鈥? cm^鈥? at 1150 nm and 8.1 脳 10⁷ M^鈥? cm^鈥? at 1200 nm are demonstrated for the solid-type and hollow-type Cu_2鈥?i>xTe nanocrystals, respectively. The experimentally observed extinction spectra and calculated extinction spectra based on the electrostatic approximation are studied. The LSPR responses in the near-infrared (NIR) region for both solid and hollow Cu_2鈥?i>xTe nanocrystals are affected by the refractive index of the medium, whereas the NIR resonance shift is more obvious in the hollow-type Cu_2鈥?i>xTe nanocrystals. Furthermore, the localized surface plasmon band of the Cu_2鈥?i>xTe nanostructures can be tuned by post processing via oxidation and reduction methods (controlling their degree of copper deficiency).