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Colloidal methods to synthesize Ag nanocrystals include citrate reduction \cite{Wu_2008,Lee_1982}, silver mirror reaction \cite{Yin_2002}, polyol synthesis \cite{Wiley_2008,Sun_2002}, seed-mediated growth \cite{Pietrobon_2009,Sun_2002,Zhang_2010}, and light-mediated synthesis \cite{Pietrobon_2008,Jin_2003,Zhou_2008}.  The polyol synthesis is a common and successful synthesis route, in which nanocrystals with well-defined shapes and sizes can be obtained.  Seed-mediated growth is essentially the polyol synthesis with nanoparticle seeds added to disentangle growth from nucleation, enhancing control of size and shape.  Slight modifications of the polyol synthesis protocol, such as introducing foreign species, enable different nanocrystal shapes to be produced.  In the synthesis of Ag nanocubes, trace amount of Na_2S can be added to increase the selectivity towards nanocubes \cite{Skrabalak_2007}. 
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As a final example, Ag nanoplates can be formed by substituting PVP with polyacrylamide into the polyol synthesis \cite{Xiong_2007}.  It has been reported that the amino groups of polyacrylamide can form complexes with metal cations \cite{Sari_2006}, greatly reducing the potential of the Ag/Ag$^+$ pair, thus reduction rate of AgNO_3 is significantly reduced.  The reduced reduction rate favors the formation of nanoplates through kinetic control.  Seed-mediated growth is essentially the polyol synthesis with nanoparticle seeds added to disentangle growth from nucleation, enhancing control of size and shape.