1. Department of Chemical Engineering The Pennsylvania State University University Park Pennsylvania 16802
2. Materials Research Institute The Pennsylvania State University University Park Pennsylvania 16802
3. Tribology Research Institute National Traction Power Laboratory Southwest Jiaotong University Chengdu 610031 China
4. Department of Physics and Astronomy & Wright Center for Photovoltaics Innovation and Commercialization The University of Toledo Toledo Ohio 43606
5. Department of Materials Science and Engineering The Pennsylvania State University University Park Pennsylvania 16802