1. Laboratory for Advanced Carbon Nanomaterials, Chemical Institute, Kazan Federal University, Kremlyovskaya Str. 18, Kazan 420008 Tatarstan, Russian Federation
2. Institute of Physics, Kazan Federal University, Kremlyovskaya Str. 18, Kazan 420008 Tatarstan, Russian Federation
3. Department of Chemistry, Rice University, 6100, Main Street, Houston, Texas 77005, United States