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Achieving tight shape-control can complement applications such as bioassays based on surface-enhanced Raman spectroscopy (SERS).  For example, a localized surface plasmon resonance bio-chip can be used for real-time detection of insulin \cite{Hiep_2008}.  \subsection{Synthesis of Metal Nanocrystals}  Metal nanocrystals can be produced through vapor-phase \cite{Swihart_2003} and colloidal methods \cite{Tao_2008}. Examples of vapor-phase methods are inert gas condensation \cite{Wegner_2002,Simchi_2007}, chemical vapor synthesis \cite{Lee_2012,Ostraat_2001}, and flame spray pyrolysis \cite{Teoh_2010}.   Vapor-phase methods require a high temperature (over 1000 $^{\circ}$C \cite{Smetana_2005}), vacuum and expensive equipments.  The scope of my investigation is limited to the chemical synthesis of colloidal metal nanocrystals. 
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For example, Au and Ag have a lattice mismatch of only 0.25\% therefore Au seeds have been successfully used as template for Ag deposition.  Synthesized shapes with the Au-Ag core-shell structure include triangular bifrustums \cite{Yoo_2009} and nanorods \cite{Seo_2008,Tsuji_2006}.  When there is a large lattice mismatch, anisotropic growth are promoted because isotropic growth is inhibited by high strain energy.  For example, Pt and Ag have a lattice mismatch of 4.15\% thus Pt nanocrystals can be used as seeds for Ag nanowires growth \cite{Sun_2002,Sun_2002b,Tsuji_2008b}.