[1] Embrapa Instrumentacao, Nanotechnol Natl Lab Agr LNNA, 15 Novembro St 1452, BR-13560970 Sao Carlos, SP, Brazil
[2] Univ Fed Sao Carlos, Dept Chem, Rod Washington Luiz,Km 235, BR-13565905 Sao Carlos, SP, Brazil
[3] Fed Univ ABC, Ctr Engn Modeling & Appl Social Sci, Ave Estados 5001, BR-09210580 Santo Andre, SP, Brazil
[4] Univ Sao Paulo, Sao Carlos Inst Phys, BR-13566590 Sao Carlos, SP, Brazil
[5] Univ Nacl Colombia, Fac Ciencias, Dept Fis, Carrera 30 Calle 45-03, Bogota 111321, Colombia