研究目的
To develop a technique for in-situ growth of gold nanoparticles on silica-coated CdSe-dot/CdS-rod nanocrystals using polyethylene glycol as a reducing agent under ultrasonic irradiation, and to study the plasmon-exciton interaction in these hybrid systems.
研究成果
The developed technique allows for the non-destructive in-situ growth of gold nanocrystals on silica-coated CdSe-dot/CdS-rod nanocrystals, leading to hybrid systems with modified optical properties due to plasmon-exciton interaction. These hybrid systems exhibit decreased fluorescence lifetimes and reduced fluorescence blinking while maintaining high fluorescence intensity.
研究不足
The technique requires precise control over the reaction conditions to prevent the penetration of gold ions into the silica shell and to ensure the formation of gold nanocrystals with a narrow size distribution.
1：Experimental Design and Method Selection:
The synthesis involved the reduction of Au3+ ions in polyethylene glycol under ultrasonic irradiation to grow gold nanocrystals on silica-coated CdSe-dot/CdS-rod nanocrystals.
2：Sample Selection and Data Sources:
CdSe/CdS dot/rods were synthesized and coated with a silica shell before functionalization with amino groups.
3：List of Experimental Equipment and Materials:
TEM (JEM-1011 by JEOL), UV-Vis spectrophotometer (Cary 5000 by Varian), pulsed diode laser (PDL800-D, PiL044X, A.L.S. GmbH), avalanche photodiode (PDM Series, Micro Photon Devices), time-correlated single-photon counting module (PicoHarp 300, Picoquant).
4：Experimental Procedures and Operational Workflow:
The synthesis process included the preparation of CdSe/CdS dot/rods, silica shell growth, functionalization, and gold nanocrystal growth under ultrasonic irradiation.
5：Data Analysis Methods:
UV-Vis spectroscopy and TEM were used to monitor the growth of gold nanocrystals, and photoluminescence spectroscopy was used to study the optical properties of the hybrid structures.
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