Nanostructured silver was obtained by potentiostatic electrolysis. The effects of ionized surfactant (sodium dodecanesulphonate) and the substrate (Cu and Ti) on the morphology of depositions were investigated. It is found that morphologies of silver nanostructures can be simply controlled via change of the substrate. Spherical Ag nanoparticles with narrow size distribution were obtained by electrodeposition in AgNO 3 -SDS aqueous solution on copper substrate. In the case of titanium substrate, silver dendrite structures were obtained. Despite of different morphologies, XRD and TEM results showed that the as-prepared samples belong to face-centered cubic silver structure with good crystallinity. The formation mechanism of different silver nanostructures was discussed.Keywords: Electrodeposition; Silver nanopartilces; Silver nano dentrites Nanometer-sized metal structures have recently attracted great interests because of their excellent electronic, magnetic, optical, thermal and catalytic properties [1][2][3][4]. It is well known that the properties of a noble metal nanostructure depend on its size, shape, morphology and crystallinity [5][6][7][8]. Therefore, much attention has been focused on the size and shape-controlled synthesis of metal nanostructures. Among many different metal nanostructures, silver nanocrystals seem to be particularly attractive because of their unique applications in active catalysts, nonlinear optical materials, electrical and thermal conductivities [9][10][11]. Silver nanoparticles with diameter under 20 nm exhibit effective antibacterial properties without side-effects and antibiotic resistance [12,13]. Nanoprism structure and nanodisks of silver exhibit optical properties different from the silver nanospheres, showing a potential application in optics [14,15]. Dendritic silver structure was developed as a novel good reproducible surface enhanced Raman scattering active substrate which can reflect different SERS effects based on different sizes of the dendrites [16][17][18][19]. Accordingly, by adjusting sizes and shapes in the process of synthesis, the physical and chemical properties of silver nanostructure can be controlled.Much effort has been made to design nanocrystals with well defined sizes, shapes and crystallinity. Until now, a number of different techniques, including electrochemical deposition [20,21], γ-irradiation route [22,23], template approach [24,25], thermal evaporation and chemical vapor deposition [26,27] have been used for growing silver nanostructures. Electrochemical deposition is relatively a simple and convenient way to synthesize silver nanostructures [28]. There are already several reports on the synthesis of silver nanostructures by electrochemical deposition [29][30][31]. The method generally involves the reduction of Ag salt in the presence of a suitable non-ionized surfactant. Zhu Junjie et al. [31] have prepared shaped silver particles in the presence of nitrilotriacetate (NTA) by pulse sonoelectrochemical method. Kang Zhenhui et al. [32] have reporte...