期刊
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
卷 119, 期 3, 页码 807-811出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-015-9122-3
关键词
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资金
- National Major Research Program of China [2013CB932602]
- Major Project of International Cooperation and Exchanges [2012DFA50990]
- Program of Introducing Talents of Discipline to Universities, NSFC [51172022]
- Program for Changjiang Scholars and Innovative Research Team in University [FRF-SD-12-032, FRF-AS-13-001]
Electrochemical biosensors are normally based on enzymatic catalysis of a reaction that produces or consumes electrons and the sensing membranes dominate the performance. In this work, ZnO nano-array-based EGFETs were fabricated for pH and glucose detection. The ZnO nano-arrays prepared via low-temperature hydrothermal method were well-aligned, with an average length of 2 mu m and diameter of 100-150 nm, and have a typical hexagonal wurtzite structure. The sensor performed with a sensitivity of 45 mV/pH and response time of about 6-7 s from pH = 4-12. UV irradiation can improve the Vref response as a result of the formation of a depletion region at the surface of ZnO nanomaterials. Due to its high specific surface area, the ZnO nano-array EGFET sensor showed a sensitivity of -0.395 mV/mu m to the glucose detection in a concentration range between 20 and 100 mu m. These EGFET glucose biosensors demonstrate a low detectable concentration (20 mu m) with good linearity, therefore may be used to detect glucose in saliva and tears at much lower concentrations than that in blood.
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