Quantum Dots(QDs) are nanoscale semiconductor particles, having size dependent electronic and optical properties. As the size of QDs increases, there band gap decreases, and a higher wavelength of light is emitted when they fluoresce. Digestive Ripening (DR) is known to convert polydisperse nanocrystals to monodisperse ones via fusion/coalescence and intraparticle growth. The goal of the experiment was to use DR technique on two different type of QDs together to find how they behave. The hypothesis was that the two different QDs would grow together in the same crystal structure forming a QD alloy. The two different QDs were subjected to DR inducing condition. The color of light emitted by QDs under UV red shifted after treatment. This is evidence for growth in size. The wavelength of emission spectrum and Transmission Electron Microscope(TEM) images before and after treatment also supported this conclusion. Furthermore, X-Ray powder diffraction(XRD) was conducted before and after treatment to compare the crystal structures. The peak from XRD of CdS+CdSe QD product after treatment was in between initial peaks of CdS and CdSe QDs. This is the evidence for formation of CdSe<sub>x</sub>S<sub>1-x</sub> QD alloy. Other combinations did not provide conclusive data.

Use of digestive ripening to synthesize quantum dot alloy nano particles

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.