INTRODUCTION Recently there has been a great deal of progress in the production of one-dimensional nanostructures with coresheath structures from a variety of materials.Among the other nano/micro-size fiber fabrication methods,electrospinning has gained growing interest in the past decade because this technique is quite versatile and costeffective for producing functional nano/micro-size fibers from variety of materials including polymers,polymer blends,emulsions,suspensions,sol-gels,metal oxides,composite structures as well as non-polymeric systems.Electrospun fibers and their webs have remarkable characteristics including a very high specific surface area,pore sizes within the nanoscale and very lightweight.Moreover,the control of the fiber surface morphology,fiber orientation,and cross-sectional configuration,quite feasible for obtaining multi-functional electrospun nanofibers.