Journal
MICROCHIMICA ACTA
Volume 186, Issue 4, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-019-3353-5
Keywords
ZnO nanostructures; Non-enzymatic sensor; Fluorometric sensor; Glucose sensing; Printed circuit board; Hydrothermal synthesis; Photoluminescence quenching
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Funding
- National Foundation for Science and Technology Development (NAFOSTED) of Vietnam [103.03-2015.27]
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A sensitive non-enzymatic fluorescent glucose sensor, consisting of vertically aligned ZnO nanotubes (NTs) grown on low-cost printed circuit board substrates, is described. The ZnO NTs were synthesized by a one-step hydrothermal method without using a seed layer. The sensor function is based on the photoluminescence (PL) quenching of ZnO NTs treated with different concentrations of glucose. The UV emission (emission maximum at 384nm under 325nm excitation) decreases linearly with increasing glucose concentration. The sensor exhibits a sensitivity of 3.5%mM(-1) (defined as percentage change of the PL peak intensity per mM) and a lower limit of detection (LOD) of 70M. This is better than previously reported work based on the use of ZnO nanostructures. The detection range is 0.1-15mM which makes the sensor suitable for practical uses in glucose sensing. The sensor was successfully applied to the analysis of human blood serum samples. It is not interfered by common concentrations of ascorbic acid, uric acid, bovine serum albumin, maltose, fructose, and sucrose.
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