[1] São Carlos Institute of Physics, University of São Paulo, SP, São Carlos,13566-590, Brazil
[2] University of São Paulo, São Carlos Institute of Chemistry, SP, São Carlos,13566-590, Brazil
[3] Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentation, São Carlos,13560-970, Brazil
[4] Hagler Fellow, Department of Biomedical Engineering, College Station Texas, Texas A&M University, 77843, United States