1. Department of Materials Science and EngineeringDepartment of ChemistryFrederick Seitz Materials Research Laboratory, and Beckman InstituteUniversity of Illinois at Urbana‐ChampaignUrbanaIllinois61801USA
2. Geballe Laboratory for Advanced MaterialsStanford UniversityStanfordCalifornia94305USA
3. Department of Bio and Brain EngineeringKorea Advanced Institute of Science and Technology (KAIST)291 Daehak‐roYuseong‐guDaejeon 34141Republic of Korea
4. The Dow Chemical Company2301 N. Brazosport Blvd., B‐1470FreeportTexas77541USA
5. Department of Mechanical Science and EngineeringUniversity of Illinois at Urbana‐ChampaignUrbanaIllinois61801USA