[1] Univ Texas Dallas, Dept Mat Sci & Engn, Richardson, TX 75080 USA
[2] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ USA
[3] Rutgers State Univ, Dept Chem & Chem Biol, Piscataway, NJ USA
[4] Wake Forest Univ, Dept Phys, Winston Salem, NC 27109 USA