We compare the dierent be-havior of the Cu 2xSe LSPR and. Cu 2xSe NCs to the addition of univalent ions. First, we explore the LSPR response of Cu 1.1S vs. A stable absorption maximum centered at 556 nm was observed 155 min after the addition of PMA, suggesting complete reduction of gold ions. With time, the LSPR absorption maximum ( max) amplitude increased steadily, the asymmetric LSPR peaks became more symmetric and the max red-shifted. The calculated coupled coefficients between SPR of the Cu 2−xS shell and LSPR of the Au NRs is 180 meV, which is much stronger than that of TSPR of Au NRs of 55 meV. and stabilize the LSPR of copper chalcogenide NCs in an attempt to increase their controlled flexibility for future appli-cations: ion intercalation, ion exchange and metal growth. resonance (LSPR) peak centered at 539 nm was detected. The dispersion properties of the coupling of 2−xS NRs with the LSPR of the initial Au core are studied experimentally by changing the length of the Au NRs, which are explained theoretically by the coupled harmonic oscillator model. The extinction spectrum of the 2−xS NRs with three coupled resonance peaks is simulated by using the FDTD method, taking into account the electron-transfer effect. Although, for 2S NRs, only TSPR and LSPR peaks can be seen and a redshift arises with the increasing Cu 2S shell thickness, implying that no plasmonic coupling between Au NRs and Cu 2S shell occurred. With the Cu 2−xS shell increasing (fixed Au NRs), the TSPR peak slightly redshifts and the LSPR and SPR peaks blueshift, owing to competition between the redshift of the refractive index effect and blueshift from the plasmon coupled effect. The extinction spectrum of 2−xS NRs is dominated by the surface plasmon resonance (SPR) of the Cu 2−xS shell, the transverse surface plasmon resonance (TSPR), and the longitudinal surface plasmon resonance (LSPR) of the Au NRs. Dual plasmonic 2−xS core−shell nanorods (NRs) have been fabricated by using a hydrothermal method and plasmon-coupled effect between the Au core and Cu 2−xS shell in the near-infrared (NIR) region.
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