Nanocomposites are either prepared in a host matrix of inorganic materials (glass, porous ceramics etc) or by using conventional polymers as one component of the nanocomposites. The second type of nanocomposites which are a special class of hybrid materials are termed “polymeric nanocomposites”. These materials are intimate combinations (up to almost the molecular level) of one or more inorganic materials (nanoparticles , eg.) with a polymer so that unique properties of the former can be mixed with the existing qualities of the polymer to result in a totally new material suitable for novel applications. In most of the cases such combinations require blending or mixing of the components, taking the polymer in solution or in melt form. Resulting nanocomposites have found successful applications in versatile fields viz. battery cathodes, i microelectronics, nonlinear optics, sensors,