1. College of Environmental Science and Engineering North China Electric Power University Beijing 102206 P. R. China
2. State Key Laboratory of Silicon Materials Center of Electron Microscopy School of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. China
3. MacDiarmid Institute for Advanced Materials and Nanotechnology School of Chemical Sciences The University of Auckland Auckland 1142 New Zealand
4. MacDiarmid Institute for Advanced Materials and Nanotechnology School of Physical and Chemical Sciences University of Canterbury Christchurch 8140 New Zealand
5. MacDiarmid Institute for Advanced Materials and Nanotechnology Institute of Fundamental Sciences Massey University Palmerston North 4442 New Zealand
6. Department of Chemistry University of North Texas Denton TX 76201 USA