1. Laboratory of Experimental and Applied Physics, Centro Federal de Educação Tecnológica Celso Suckow da Fonseca, Av. Maracanã 229, Rio de Janeiro 20271-110, Brazil
2. National Nanotechnology Laboratory for Agribusiness (LNNA), Embrapa Instrumentação, São Carlos 13560-970, Brazil
3. Department of Chemistry, Federal University of São Carlos (UFSCar), São Carlos 13565-905, Brazil