标题：Nickel-Foam-Supported Co3O4 Nanosheets/PPy Nanowire Heterostructure for Non-enzymatic Glucose Sensing
作者：Dai, Hongxiu; Lin, Meng; Wang, Nan; Xu, Fei; Wang, Donglei; Ma, Houyi
作者机构：[Dai, Hongxiu; Lin, Meng; Wang, Nan; Xu, Fei; Wang, Donglei; Ma, Houyi] Shandong Univ, Sch Chem & Chem Engn, State Educ Minist, Key Lab Colloid & Inte 更多
通讯作者地址：[Lin, M]Shandong Univ, Sch Chem & Chem Engn, State Educ Minist, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China.
关键词：Co3O4 nanosheets; electrochemical sensor; glucose; non-enzymatic; PPy; nanowires
摘要：Cobalt oxide nanosheets (Co3O4 NSs)/polypyrrole nanowire (PPy NW) core-shell nano-heterostructures based on nickel foam (NF) were fabricated for electrochemical non-enzymatic glucose determination. The Co3O4/PPy nanostructures grew directly on nickel foam substrate by electrochemical deposition processes. The PPy NW core and the Co3O4 NS shell constructed the hierarchical nanocomposites to form a three dimensional micro-nanostructure in the micropores of NF. The as-prepared Co3O4/PPy/NF heterostructures were characterized by using scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The introduction of the Co3O4 NSs can provide a high surface area and lead to high sensitivity to glucose. Chronoamperometry was used to evaluate the sensitivity of the sensor toward glucose. Compared with NF, PPy/NF, and Co(OH)(2)/PPy/NF electrodes, the Co3O4/PPy/NF electrode exhibited higher electrocatalytic activity for the oxidation of glucose, and the proposed glucose sensor showed linear electrochemical responses to glucose with a low detection limit of 0.74 mu M (S/N = 3). In addition, the prepared biosensor revealed good selectivity in the presence of electro-active species such as D-fructose, uric acid, ascorbic acid and hydrogen peroxide, and provided an excellent platform for the determination of glucose in human urine samples.