Juan Beltran-Huarac1,2, Jennifer Carpena-Nuñez2, Danilo Barrionuevo2, Frank Mendoza1,2, Ram S. Katiyar1,2, Luis F. Fonseca1,2, Brad R. Weiner1,3, Gerardo Morell1,2
1Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, PR 00931, USA
2Department of Physics, University of Puerto Rico, San Juan, PR 00936, USA
3Department of Chemistry, University of Puerto Rico, San Juan, PR 00936, USA