1. Center for Bioelectronics and Biosensors, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA.
2. School of Electrical Computer and Energy Engineering, Arizona State University, Tempe, AZ 85287, USA.
3. State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.