1. Department of Chemistry, University of Central Florida, Orlando, FL 32816, USA.
2. NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA.
3. Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, USA.
4. The College of Optics and Photonics (CREOL), University of Central Florida, Orlando, FL 32816, USA.