[1] Sandia Natl Labs, Dept Mat Devices & Energy Technol, Albuquerque, NM 87185 USA
[2] Rice Univ, Dept Chem & Mech Engn, Houston, TX 77005 USA
[3] Rice Univ, Dept Mat Sci, Houston, TX 77005 USA
[4] Rice Univ, Smalley Inst Nanoscale Sci & Technol, Houston, TX 77005 USA
[5] Sandia Natl Labs, Dept Photon Microsyst, Albuquerque, NM 87185 USA
[6] Sandia Natl Labs, Dept Mat Characterizat, Albuquerque, NM 87185 USA