16 September 2011 Modulation of CdSe fluorescence using palladium nanoparticles
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Abstract
The increasing demand for clean, efficient energy has strongly influenced the direction of nanoscale research. One of the most promising areas of solar energy production lies with cadmium selenide quantum dots (CdSe QDs). As a means to improve the efficiency of solar energy conversion in QDs, metal nanoparticles have been examined. It has been shown that in certain systems the presence of these metal nanoparticles increase electron - hole charge separation thus providing extended times for electron harvesting. Most of the systems currently explored utilize gold nanoparticles, which is unsurprising due to the vast amount of synthetic methods for these particles and their plasmonic effects on the QDs. We seek to further examine these unique metal nanoparticle -quantum dot interactions through the study of CdSe QD - palladium nanoparticle systems. We employ both steady-state and time resolved ensemble fluorescence spectroscopy to observe the effects of increasing palladium nanoparticle concentrations on both the fluorescence intensity and lifetime of various CdSe QDs. We find that decreasing separation distance between the particles through increasing palladium concentration, leads to a stronger interaction between the particles. We find expected fluorescence quenching of the QDs at higher concentrations of palladium. At low palladium concentrations however we observe a unique fluorescence enhancement of the QDs. We use this data to explore the relative contributions of energy and electron transfer between the particles and determine the conditions under which the maximum effects of these interactions are observed.
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Kevin J. Major, Kevin J. Major, Marcus Jones, Marcus Jones, } "Modulation of CdSe fluorescence using palladium nanoparticles", Proc. SPIE 8098, Physical Chemistry of Interfaces and Nanomaterials X, 80980T (16 September 2011); doi: 10.1117/12.893922; https://doi.org/10.1117/12.893922
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