Abstract
Optical properties of nanomaterials such as semiconductor and metal quantum dots are important for sensors and photovoltaic applications. We report on optical, microscopic, and AFM investigations on bulk and single nanoobjects such as metal and semiconducting nanoparticles. Firstly, of special interest is the investigation of Ag metal nanoaggregates formed in zeolites. Here, the defined structure of the zeolite serves both as size directing and a stabilizing agent. The size selected Ag aggregates fluoresce in the zeolite cages even after storage under ambient conditions for almost one year. In addition, single Ag particles escape the cages and can be investigated by fluorescence microscopy also with respect to sensor applications. Secondly, with respect to photovoltaic applications, energy transfer among organic dye molecules and semiconductor quantum dots is of great importance. We report on the extension of the optical absorption of ZnSe quantum dots into the UV regime and investigate excitation energy transfer within self-assembled nanoaggregates of surface functionalized QDs and fluorescent styrylpyridine dyes.
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Acknowledgements
We thank Martin Neumann for AFM measurements and Dr. Frank Rauscher, Bayer Technology Services for providing ZnSe quantum dots. Financial support from the Fonds der Chemischen Industrie and BAYER Technology Services is gratefully acknowledged.
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Kahle, I., Krause, S., Krasselt, C. et al. Assemblies from metallic and semiconducting nanocrystals. Appl. Phys. A 115, 617–625 (2014). https://doi.org/10.1007/s00339-013-8027-2
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DOI: https://doi.org/10.1007/s00339-013-8027-2