title: Three-dimensional roselike α-Ni(OH)₂ assembled from nanosheet building blocks for non-enzymatic glucose detection.
abstract: Glucose detection plays very important roles in diagnostics and management of diabetes. The search for novel catalytic materials with appropriate architectures is the key step in the fabrication of highly sensitive glucose sensors. In this work, α-Ni(OH)2 roselike structures (Ni(OH)2-RS) assembled from nanosheet building blocks were successfully synthesized by a hydrothermal method through the hydrolysis of nickel chloride in the mixed solvents of water and ethanol with the assistance of polyethylene glycol (PEG). The structure and morphology of the roselike α-Ni(OH)2 were characterized by transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD) and N2 adsorption-desorption isotherm measurement. TEM and FE-SEM images showed that the synthesized Ni(OH)2 was roselike and the size of the leaf-shaped nanosheet was about 5 nm in thickness, which leads to larger active surface areas and faster electron transfer for the detection of glucose. Compared with the bare GCE and bulk Ni(OH)2/GCE, the Ni(OH)2-RS/GCE had higher catalytic activity toward the oxidation of glucose. Under the optimal conditions, the Ni(OH)2-RS/GCE offers a variety of merits, such as a wide linear response window for glucose concentrations ranging from 0.87 μM to 10.53 mM, short response time (3s), a lower detection limit of 0.08 μM (S/N=3), as well as long term stability and repeatability.
authors.affiliation: College of Materials Science and Metallurgy Engineering, Guizhou University, Guiyang 550025, PR China.
authors.forename: Pan
authors.initials: P
authors.lastname: Lu
authors.affiliation: College of Life Sciences, Guizhou University, Guiyang 550025, PR China.
authors.forename: Yuting
authors.initials: Y
authors.lastname: Lei
authors.affiliation: College of Materials Science and Metallurgy Engineering, Guizhou University, Guiyang 550025, PR China. Electronic address: shjlu71@163.com.
authors.forename: Shengjun
authors.initials: S
authors.lastname: Lu
authors.affiliation: College of Materials Science and Metallurgy Engineering, Guizhou University, Guiyang 550025, PR China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Guizhou Key Laboratory for Microstructure and Strength of Materials, Guiyang, Guizhou 550003, PR China. Electronic address: qbliu2@263.net.
authors.forename: Qibin
authors.initials: Q
authors.lastname: Liu
mesh_terms: D002384:Catalysis; D055664:Electrochemical Techniques; D004566:Electrodes; D004579:Electron Transport; D005947:Glucose / Q000032:analysis*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D009532:Nickel / Q000737:chemistry*; D010084:Oxidation-Reduction; D011092:Polyethylene Glycols / Q000737:chemistry; D015203:Reproducibility of Results; D013499:Surface Properties
chemical_list: D011092:Polyethylene Glycols; C022838:nickel chloride; D009532:Nickel; D005947:Glucose
keywords: Electrocatalytic oxidation; Glucose; Non-enzymatic glucose sensor; Roselike α-Ni(OH)(2)