Triggering interface potential barrier: A controllable tuning mechanism for electrochemical detection.
A novel theory of employing interface potential barriers as a controllabe tuning factor for electrochemical detection is proposed. The 3D NiO/PANI/ZnO hierarchical heterostructure is fabricated by thermal oxidation, electropolymerization and electrodeposition. The 3D NiO/PANI/ZnO heterostructure is then chose as a model for electrochemical detection of dopamine, uric acid and ascorbic acid. The p-n and p-p junction interface potential barriers are employed as tuning factors to achieve high selectivity and sensitivity. Our results demonstrate the electrochemical response to different targets can be controllable enhanced or weakened by rational design of interface potential barriers. The potential barrier height Φp-n is an enhanced tuning factor, and Φp-p is a selective tuning factor. We afford a controllable adjustive approach to achieve desired selectivity and sensitivity.
Department of Materials Science and Engineering, Ocean University of China, 266100 Qingdao, PR China.
Longjiang
L
Ding
Department of Materials Science and Engineering, Ocean University of China, 266100 Qingdao, PR China. Electronic address: zhaomg@ouc.edu.cn.
Minggang
M
Zhao
Department of chemistry, Imperial College London, SW7 2AZ London, UK.
Ye
Y
Ma
Department of Materials Science and Engineering, Ocean University of China, 266100 Qingdao, PR China.
Sisi
S
Fan
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
Zhen
Z
Wen
Department of Materials Science and Engineering, Zhejiang University, 310027 Hangzhou, PR China.
Jingyun
J
Huang
Department of Materials Science and Engineering, Ocean University of China, 266100 Qingdao, PR China.
Jingjing
J
Liang
Department of Materials Science and Engineering, Ocean University of China, 266100 Qingdao, PR China. Electronic address: sgchen@ouc.edu.cn.
Shougang
S
Chen
D000814:Aniline Compounds / Q000737:chemistry*; D001205:Ascorbic Acid / Q000032:analysis*; D015374:Biosensing Techniques / Q000379:methods; D004298:Dopamine / Q000032:analysis*; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D004595:Electroplating; D049329:Nanostructures / Q000737:chemistry / Q000648:ultrastructure; D009532:Nickel / Q000737:chemistry*; D014527:Uric Acid / Q000032:analysis*; D015034:Zinc Oxide / Q000737:chemistry*
D000814:Aniline Compounds; C416807:polyaniline; D014527:Uric Acid; D009532:Nickel; C028007:nickel monoxide; D001205:Ascorbic Acid; D015034:Zinc Oxide; D004298:Dopamine
Electrochemical detection; Heterostructure; Interface potential barrier; NiO/polyaniline/ZnO; Tuning factor