1. Contribution from the ARC Centre for Functional Nanomaterials, Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, QLD 4072, Brisbane, Australia, Shenyang National Laboratory for Materials Science, Institute of Metals Research, Shenyang 110015, China, §Centre for Computational Molecular Science, The University of Queensland, QLD 4072, Brisbane, Australia, and ⊥Centre for Microscopy and Microanalysis, The University of Queensland, QLD 4072, Brisbane, Australia