研究目的
To investigate the self-assembly method for preparing array nano-wires of colloidal CdSe quantum dots on a substrate of porous Al2O3 film modified by gold nanoparticles and measure their photoluminescence (PL) spectra.
研究成果
The self-assembly method successfully prepared array nano-wires of colloidal CdSe quantum dots on porous Al2O3 film modified by gold nanoparticles. The fluorescence on the Al2O3/Au/CdSe interface was significantly enhanced in the self-assembly nano-wire regions due to the electron transfer conductor effect of gold nanoparticles. This method has potential applications in photodetectors, photocatalysis, optical displays, optical sensing, and biomedical imaging.
研究不足
The study focuses on the fluorescence enhancement and energy transfer effects of the self-assembled CdSe nano-wires on porous Al2O3 film modified by gold nanoparticles. Potential limitations include the difficulty in purification and monodisperse of the colloidal chemistry method, and the aggregation features of CdSe QDs.
1：Experimental Design and Method Selection:
A self-assembly method was used to prepare array nano-wires of colloidal CdSe quantum dots on a substrate of porous Al2O3 film modified by gold nanoparticles. The PL spectra were measured in situ using a scanning near-field optical microscopy (SNOM) probe tip with a 100-nm aperture.
2：Sample Selection and Data Sources:
The samples included colloidal CdSe quantum dots, porous Al2O3 film modified by gold nanoparticles, and the prepared self-assembled CdSe nano-wires.
3：List of Experimental Equipment and Materials:
Scanning near-field optical microscope (Nanonics, Mv4000), atomic force microscope (AFM), fiber optical spectrometer (Ocean optics, QE6500), ultraviolet (UV) laser (Changchun new industries Ltd., CNI-360).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The CdSe QDs solution was dropped on the surface of porous Al2O3 film modified with gold NPs, and the self-assembly nanostructures of CdSe QDs were formed. The PL spectra and surface topography map were in situ obtained in the process of scanning.
5：Data Analysis Methods:
The PL spectra were analyzed to compare the fluorescence enhancement and energy transfer effects.
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