1. Department of Chemistry and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
2. Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 13560-970 São Carlos, São Paulo, Brazil
3. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
4. Institute of Geosciences and Exact Sciences, São Paulo State University (UNESP), 13506-700 Rio Claro, São Paulo, Brazil