1. Institute of Physics, Federal University of Goiás, Goiânia, GO 74690-900, Brazil
2. Department of Chemistry, Physics and Materials Science, Fayetteville State University, Fayetteville, North Carolina 28301, United States
3. Green Nanotechnology Group, University of Brasília, Ceilândia, DF 72220-275, Brazil
4. CNanoMed, Federal University of Goiás, Goiânia, GO 74690-631, Brazil