1Department of Chemistry, Rice University, 6100 Main Street, Houston, TX 77005, USA
2Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Rice University, 6100 Main Street, Houston, TX, 77005 USA
3School of Materials Science and Engineering, Beihang University, Beijing 100191, China
4Smalley-Curl Institute and NanoCarbon Center, Rice University, 6100 Main Street, Houston, TX, 77005 USA
5Department of Materials Science and NanoEngineering, Rice University, 6100 Main Street, Houston, TX, 77005, USA