ELECTRONIC SUPPLEMENTARY INFORMATION Convenient Architectures of Cu 2 O/SnO 2 Type II p- n Heterojunctions and their Application in Visible Light Catalytic Degradation of Rhodamine B Shravanti Joshi, a, b, d Samuel J. Ippolito, a, b, c and Sunkara V. Manorama b, d* a Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Science, College of Science, Engineering & Health, RMIT University, Melbourne, VIC 3001, Australia. b RMIT-IICT Research Centre, CSIR-Indian Institute of Chemical Technology, Hyderabad - 500 007, India. c School of Engineering, RMIT University, Melbourne, VIC 3001, Australia. d Nanomaterials Laboratory, Inorganic & Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad - 500 007, India. E-mail address: manorama@iict.res.in, Tel.: +91 40 27193225; Fax: +91 40 27160921. * To whom all Correspondence should be addressed. Electronic Supplementary Material (ESI) for RSC Advances. This journal is © The Royal Society of Chemistry 2016