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The morphology and dimensions of the product were shown to depend on the reaction conditions \cite{Sun_2002}.  Irregular nanoparticles were obtained when the temperature is below 120$^{\circ}$C or above 190$^{\circ}$C.  At the initial concentration of AgNO_3 higher than 0.1 M nanocubes were formed, otherwise nanowires were the major product.  Multiply twinned particles were obtained instead of single crystal cubes when the molar ratio of PVP to AgNO_3 was increased from 1.5 to 3.  $ Introducing foreign species  Slight modifications of the polyol synthesis protocol, such as introducing foreign species, enable different nanocrystal shapes to be produced. 
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