Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 30: Poster: Quantum dots and wires: Preparation, characterization, optical properties and transport

HL 30.1: Poster

Montag, 31. März 2014, 17:00–20:00, P2

Raman and AFM Characterization of Ultrasmall CdS Nanoparticles Incorporated in Polymeric Matrix — •Dmytro Solonenko1, Volodymyr Dzhagan2, Oleksandra Raevska3, Oleksandr Stroyuk3, Ovidiu D. Gordan1, and Dietrich R. T. Zahn11Semiconductor Physics, Technische Universität Chemnitz, Chemnitz, Germany — 2E. Lashkaryov Institute of Semiconductor Physics, Kyiv, Ukraine — 3L.V. Pysarzhevskiy Institute of Physical Chemistry, Kyiv, Ukraine

Semiconductor nanoparticles (NPs), or quantum dots, gain wide interest due to anumber of striking features: tunable and narrow features in photoluminescence (PL) and absorption spectra, high chemical and photophysical stability, and high PL quantum yields. Theunique properties of ultrasmall NPs include broadband PL. They can also be strongly influenced by environment and stabilizing ligands. However, both ordinary and ultrasmall NPs should be processed before their applicationin various optoelectronic devices. In this work we investigated the interactions between ultrasmall CdS NPs stabilized by mercaptoacetic acids and ammonia (N2H4) with polymers such as polyethyleneimine (PEI), polyethylene glycol (PEG), and surfactant sodium dodecyl sulfate (SDS) by Raman spectroscopy and AFM. Thin polymer films containing NPs were prepared by spin- and spray-coating. We concluded that neutral polymers such as PEG as well as SDS refrain from chemical interaction with the negatively charged NPs surface, while polycationic PEI chemically reacts with the NPs resulting in the formation of agglomerates in a colloidal phase.

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