We use micro-Raman spectroscopy to probe the structure of alloyed CdSe/CdS and InP/GaP quantum dots. The alloyed quantum dot series CdSe1-xSx includes CdSe, CdSe0.75S0.25, CdSe0.50S0.50, CdSe0.25S0.75, and CdS. We measured Raman spectra at 77 K and observe a longitudinal optical (LO) phonon mode for both CdSe and CdS in these samples. The CdS LO frequency at 302 cm-1 and the CdSe LO frequency at 206 cm-1 each decrease as the sulfur and selenium content of the alloys decreases, respectively. These trends with composition are consistent with two-mode" behavior that is characteristic of homogeneous alloys of CdSe/CdS. Raman spectra of CdS/CdSe and CdSe/CdS core/shell nanoparticles are distinct from the alloy spectra. The alloyed quantum dot series In1-xGaxP includes GaP, In0.25Ga0.75P, In0.5Ga0.5P, In0.75Ga0.25P, and InP. We measured Raman spectra at room temperature and observe a broad peak between 300 and 370 cm-1. The single broad peak shifts to lower frequency as more indium is incorporated. This trend with composition suggests "one-mode" behavior that is expected for homogeneous InP/GaP alloys.

Raman spectroscopic studies of the structure of alloyed quantum dots

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.