Materials Research Laboratory

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Materials Science and Engineering Colloquium

Event Type
MatSE Department
100 Materials Science and Engineering Building
Nov 11, 2013   4:00 pm  
Linda Hirst, School of Natural Sciences, University of California, Merced
Originating Calendar
MatSE Seminars

"Liquid crystal/quantum dot hybrid materials" - Ensembles of nanoparticles (NPs) demonstrate collective behaviors that are fascinating variations on their bulkand single particle properties. These include novel electronic, magnetic and photonic effects, such as plasmonicresonances in metallic NP arrays, superparamagnetism in assembled magnetic NPs and Forster resonance energy transfer (FRET) between semiconductor particles such as Quantum dots (QDs). Controlling the assembly of interacting nanoparticles is therefore an important goal in materials science as we aim to develop organized

and close-packed two and three-dimensional NP super-lattices to form new meta-materials. QDs are particularly interesting due to their unique size-tuneable properties. Creating macroscopic ordered assemblies of QDs

with actively tunable properties is a challenging problem that our group hopes to address using a liquid crystalline template. In this talk, I will discuss recent results from our group in QD dispersion and assembly using liquid crystals as

an active medium to form hybrid solid state/liquid crystal materials. Recent progress in QD functionalization with mesogenic ligands will be discussed. Our group uses fluorescence and polarized microscopy, photoluminescence

confocal microscopy and time resolved spectroscopy to look at the emission of QDs in the nematic, and cholesteric phases, synchrotron x-ray diffraction allows further investigation of the hybrid materials’ structure, probing QD organization within the liquid crystal.

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