[1] Rice Univ, Dept Mech Engn & Mat Sci, Houston, TX 77005 USA
[2] Natl Inst Adv Ind Sci & Technol, Nanotube Res Ctr, Tsukuba, Ibaraki 3058565, Japan
[3] Univ Utah, Dept Mat Sci & Engn, Salt Lake City, UT 84112 USA
[4] Prairie View A&M Univ, Dept Phys, Prairie View, TX 77446 USA
[5] Natl High Magnet Field Lab, Tallahassee, FL 32310 USA