Supplementary Information Poly [3-(2-hydroxyethyl)-2, 5-thienylene] grafted reduced graphene oxide: An efficient alternating material of TiO 2 for dye sensitized Solar Cell Shreyam Chatterjee a , Astam K. Patra b , Asim Bhaumik b and Arun K. Nandi* a a Polymer Science unit, b Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, kolkata- 700 032. Electronic Supplementary Material (ESI) for Chemical Communications This journal is © The Royal Society of Chemistry 2013