Supplementary Material (ESI) for PCCP This journal is © the Owner Societies 2010 1 Supporting Information Selective Synthesis of Diameter- and Interlayer-Controlled Carbon Nitride Nanotubes with Hydrogen Ensnaring Nanopores Jun Hyeon Bae, Jung Hoon Choi, Weon Ho Shin, Jung Woo Lee, Yoon Jeong Choi, and Jeung Ku Kang NanoCentury KI, Graduate School of EEWS, Department of Materials Science & Engineering, KAIST, 373-1 Guseong Dong, Yuseong Gu, Daejeon 305-701, Republic of Korea Experimental Procedures Synthetic procedure of templates: The organic silica mesoporous template was synthesized from a mixture with 1,4-bis(triethoxysilyl)benzene (BTEB) precursor, Aldrich, in the presence of Octadecyltrimethylammonium chloride (ODTMA) surfactant, TCI. Ionic surfactant ODTMA (6.666g, 47.88mmol) was dissolved in a mixture of ionic-exchanged water (200ml) and 6M sodium hydroxide (NaOH) aqueous solution (16ml, 200mmol NaOH) at 50~60 ◦ C. BTEB (8ml, 49.67mmol) was added to the transparent mixture solution in which ODTMA was dissolved completely under the vigorous stirring at room temperature. The solution was treated ultrasonically for 20 min and stirred for 20 hrs at room temperature. After stirring, the mixture was kept in a 95 ◦ C oven for 20 hrs under static condition. The resulting white precipitate was collected by filtration and dried to yield as-synthesized organic silica mesoporous materials. Surfactants embedded in pores were removed by stirring 1.0g of as-made materials in 250ml of ethanol with 9ml of 36% HCl aqueous solution at 70 ◦ C for 8 hrs to yield an organic silica mesoporous templat.e 1