Local control of the domain orientation in diblock copolymer thin films can be obtained by the application of electric fields, which is a crucial element to their potential use as templates for nanostructured materials. Here we describe a particularly simple electric field set-up that allows high electric field needed, with potentials of only several of volts for electrodes separated by few micrometers or, without buffer layer between copolymer thin film and electrode. Alignment of cylindrical microdomains of an asymmetric block copolymer PS-PMMA was studied in an oscillating electric field. Complete alignment of the cylindrical microdomains was achieved perpendicular to the substrate, without balancing any interfacial interactions. A systematic study was carried out to study the effect of varying thickness of diblock copolymer thin films, molecular weight of diblock copolymer, time on the morphology and frequency of AC field. The experiments described above were also carried under DC fields. The alignment of copolymer microdomains under DC electric field is found to be comparable to AC alignments for diblock copolymer system. Perpendicular alignment of cylindrical microdomains and packing of cylinders in hexagonal pattern was found to improve with thickness of film. The PMMA cylinders were found to align in the direction of field in time as low as 5 min. Here I also demonstrate in-progress work to incorporate nanorods in desired microdomain of copolymer by controlling their surface chemistry.