[1] Univ Calif San Diego, Dept NanoEngn, La Jolla, CA 92093 USA
[2] Songshan Lake Mat Lab, Dongguan 523808, Peoples R China
[3] Spallat Neutron Source Sci Ctr, Dongguan 523803, Peoples R China
[4] Univ Calif San Diego, Program Mat Sci & Engn, La Jolla, CA 92093 USA
[5] Univ Calif San Diego, Sustainable Power & Energy Ctr SPEC, La Jolla, CA 92093 USA