1. Key Laboratory of Optoelectronic Technology and Systems Ministry of Education International R&D Center of Micro‐Nano Systems and New Materials Technology Chongqing University Chongqing 400044 P. R. China
2. Department of Clinical Laboratory Southwest Hospital Third Military Medical University (Army Medical University) Chongqing 400038 China
3. Department of Electrical and Computer Engineering Center for Intelligent Sensors and MEMS (CISM) NUS Graduate School for Integrative Sciences and Engineering National University of Singapore Singapore 117576 Singapore