[1] Penn State Univ, Dept Elect Engn, Mat Res Inst, University Pk, PA 16802 USA
[2] Penn State Univ, Dept Mat Sci & Engn, Mat Res Inst, University Pk, PA 16802 USA
[3] Shanghai Second Polytech Univ, Sch Urban Dev & Environm Engn, Shanghai 201209, Peoples R China
[4] Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA
[5] Univ Texas Austin, Dept Mech Engn, Austin, TX 78712 USA
[6] Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA