Tuesday, 24 May 2005

This presentation is part of: NanoScience and Technology Posters

Formation of Nano-sized Lead Sulfide and Cadmium Sulfide by Using Ionomers

Kayla A. Lu, Roshan Deen, and Masanori Hara. Rutgers University, Piscataway, NJ

Semiconductor nano-particles have been studied extensively in the past few decades. The blue-shifts occur in their band-gap compare to those of the bulk, known as the quantum size effect. These nano-sized semiconductors also exhibit unique electrical, optical, and mechanical properties that have potential applications in electronic devices. Semiconductors such as lead sulfide (PbS) and cadmium sulfide (CdS) were synthesized in various concentrations of poly(methyl methacrylate-methacrylic acid) (MMA-MAA) ionomer by a solid-state method that we have developed. Ions in the ionomer were exposed to Hydrogen sulfide (H2S) for a sufficient amount of time to completely convert Pb2+ and Cd2+ ions to PbS and CdS. The changes in color (blue shift) were apparent, reflecting the formation of the nano-sized semiconductors. One of the tests used was Differential Scanning Calorimeter (DSC) to measure the glass transition temperatures (Tg). The increase in Tg with the increase in ion content was observed. UV-vis spectroscopy was used to determine the sizes and size distributions of the nano-particles. The UV-spectrum showed that the size of the nano-particles decreases with decreasing ion content.

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