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The polyol synthesis is a common and successful synthesis route, in which nanocrystals with well-defined shapes and sizes can be obtained.  % Talk about different polyol synthesis  In a self-seeding polyol synthesis, AgNO_3 and PVP are dissolved in ethylene glycol.  The mixture is typically refluxed at 150$^{\circ}$C. 150 C.  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 120 C  or above 190$^{\circ}$C. 190 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. 
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