1. Laboratory of Sensors, Nanomedicine and Nanostructured Materials, Federal University of São Carlos, Araras 13600-970, Brazil
2. Department of Physics, Chemistry, and Mathematics, Federal University of São Carlos, Sorocaba, São Paulo 18052-780, Brazil
3. Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, São Paulo 05508-000, Brazil
4. Institute of Physics “Gleb Wataghin”Applied Physics Department, State University of Campinas, Campinas 13083-859, Brazil
5. Instituto Nacional de Ciência e Tecnologia de Bioanalítica, Campinas, Campinas 13083-970, Brazil