1. School of Mechanical and Aerospace Engineering; Nanyang Technological University; Singapore 639798 Singapore
2. SUNCAT Center for Interface Science and Catalysis; Department of Chemical Engineering; Stanford University; CA 94305 USA
3. SUNCAT Center for Interface Science and Catalysis; SLAC National Accelerator Laboratory; CA 94025 USA
4. Department of Mechanical Engineering; Stanford University; CA 94305 USA
5. School of Electrical and Electronic Engineering; CINTRA CNRS/NTU/THALES; UMI 3288; Research Techno Plaza; Nanyang Technological University; Singapore 639798 Singapore