1. NanoScience and Technology Center, University of Central Florida, Orlando, Florida 32826, USA
2. Burnett School of Biomedical Sciences, University of Central Florida, Orlando, Florida 32816, USA
3. Department of Materials Science and Engineering, University of Central Florida, Orlando, Florida 32816, USA
4. Department of Chemistry, University of Central Florida, Orlando, Florida 32816, USA
5. Bruker Nano Surfaces, 112 Robin Hill Rd., Santa Barbara, California 93117, USA
6. Department of Physics, University of Central Florida, Orlando, Florida 32816, USA