期刊
BIOSENSORS & BIOELECTRONICS
卷 67, 期 -, 页码 66-72出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2014.06.047
关键词
Coordination polymer; Manganese; Nanomaterials; Bidirectional electrocatalysis; Electrochemical sensing; Hydrogen peroxide determination
类别
资金
- National Natural Science Foundation of China [21175068, 21335004]
Metal organic coordination polymers (CPs), as most attractive multifunctional materials, have been studied extensively in many fields. However, metal-biomolecule CPs and CPs' electrochemical properties and applications were studied much less. We focus on this topic aiming at electrochemical biosensors with excellent performance and high biocompatibility. A new nanoscaled metal-biomolecule CP, Mn-tyr, containing manganese and tyrosine, was synthesized hydrothermally and characterized by various techniques, including XRD, TEM, EDS, EDX mapping, elemental analysis, XPS, and IR. Electrode modified with Mn-tyr showed novel bidirectional electrocatalytic ability toward both reduction and oxidation of H2O2, which might be due to Mn. With the assistance of CNTs, the sensing performance of Mn-tyr/CNTs/GCE was improved to a much higher level, with high sensitivity of 543 mA mol(-1) L cm(-2) in linear range of 1.00 x 10(-6)-1.02 x 10(-4) mol L-1, and detection limit of 3.8 x 10(-7) mol L. Mn-tyr/CNTs/GCE also showed fast response, high selectivity, high steadiness and reproducibility. The excellent performance implies that the metal-biomolecule CPs are promising candidates for using in enzyme-free electrochemical biosensing. (C) 2014 Elsevier B.V. All rights reserved.
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