Title:
Putting Chemistry to Work for Nano and Biomedical Research
Putting Chemistry to Work for Nano and Biomedical Research
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Author(s)
Xia, Younan
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Abstract
Nanomaterials are finding widespread use in many applications, including
electronics, photonics, information storage, catalysis, as well as diagnosis and
treatment of diseases. Chemistry plays a pivotal role in all these exciting
developments because it allows for the synthesis of nanomaterials with
well-controlled sizes, shapes, compositions, structures, and properties. In this
talk, I will demonstrate this concept using a number of examples from my own
research group, including silver/palladium nanocubes, gold nanocages, and
platinum nanodendrites. While the synthetic methods mainly involve
solution-phase redox chemistry, we have been working diligently to understand
the complex physics behind the simple chemistry – that is, the nucleation and
growth mechanisms leading to the formation of nanocrystals with specific
shapes. For example, we have discovered that the shape of metal nanocrystals
are dictated by the crystallinity and structure of the seeds, which are, in turn,
controlled by factors such as reduction kinetics, oxidative etching, diffusion, and
surface capping. The methodologies we have developed seem to work well for
all noble metals including silver, gold, palladium, platinum, and rhodium. The
success of these syntheses has enabled us to tailor the electronic, plasmonic,
and catalytic properties of noble-metal nanocrystals for a range of applications in
catalysis and biomedical research.
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Date Issued
2012-08-29
Extent
56:42 minutes
Resource Type
Moving Image
Resource Subtype
Lecture