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This is because polarization of free electrons and charges distribution occurs over the nanocrystal surface.  Among all metals, Ag exhibits the strongest plasmonic interaction with light \cite{Lu_2009}.  Achieving tight shape-control can complement applications such as bioassays based on surface-enhanced Raman spectroscopy (SERS).  For example, a localized surface plasmon resonance biochip bio-chip  can be used for real-time detection of insulin \cite{Hiep_2008}. \subsection{Research objective}  Our research objective is to gain molecular understanding of on  how Ag nanocrystals are grown to specific shapes, such as nanocubes \cite{Im_2005} \cite{Im_2005}, nanoplates \cite{Lofton_2005}  and nanowires \cite{Tsuji_2008}. We find these questions intriguing:   How are {100} facets stabilized in the growth of nanocubes?  How are twinned nanocrystals formed and stabilized?  How does stabilizing agents, foreign species, and solvent molecules contribute to shape selectivity?