Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 42, Pages 21955-21964Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp407559b
Keywords
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Funding
- National Science Council of Taiwan [NSC 102-2221-E-007-023-MY3, NSC 101-2623-E-007-013-IT]
- Minitry of Economic Affairs, Taiwan [101-EC-17-A-09-S1-198]
- National Tsing Hua University [102N2051E1, 102N2061E1]
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Solid and hollow structures of Cu2-xTe nanocrystals are synthesized by the injection of a Te-TOP solution at different reaction times. Both types of Cu2-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 x 10(7) M-1 cm(-1) at 1150 nm and 8.1 x 10(7) M-1 cm(-1) at 1200 nm are demonstrated for the solid-type and hollow-type Cu2-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 Cu2-xTe nanocrystals are affected by the refractive index of the medium, whereas the NIR resonance shift is more obvious in the hollow-type Cu2-xTe nanocrystals. Furthermore, the localized surface plasmon band of the Cu2-xTe nanostructures can be tuned by post processing via oxidation and reduction methods (controlling their degree of copper deficiency).
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