1. Laboratory for Advanced Carbon Nanomaterials, Kazan Federal University, Kremlyovskaya Street 18, Kazan 420008, Russian Federation
2. Institute of Physics, Kazan Federal University, Kremlyovskaya Street 18, Kazan 420008, Russian Federation
3. Departments of Chemistry and Materials Science and NanoEngineering, Smalley-Curl Institute and the NanoCarbon Center, Rice University, 6100 Main Street, Houston, Texas 77005, United States