[1] Univ New Orleans, Dept Chem, New Orleans, LA 70148 USA
[2] Univ New Orleans, Dept Phys, New Orleans, LA 70148 USA
[3] Univ New Orleans, Adv Mat Res Inst, New Orleans, LA 70148 USA
[4] Univ Texas, Dept Chem, Dallas, TX USA
[5] Univ Texas, Dept Phys, Dallas, TX USA
[6] Univ Texas, NanoTech Inst, Dallas, TX USA