title: Perovskite LaTiO₃-Ag0.2 nanomaterials for nonenzymatic glucose sensor with high performance.
abstract: In this paper, a nonenzymatic glucose biosensor based on perovskite LaTiO3-Ag0.2(LTA) modified electrode was presented. The morphology and the composition of the perovskite LaTiO₃-Ag0.2 nanomaterials were characterized by using scanning electron microscopy (SEM) and X-ray diffraction (XRD) respectively. The LaTiO₃-Ag0.2(LTA) composite was investigated by electrochemical characterization using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Under optimal conditions, CV and chronoamperometry (I-t) study revealed that, compared with the bare glassy carbon electrode (GCE), the modified electrode showed a remarkable increase in the efficiency of the electrocatalytic oxidation of glucose, starting at around +0.70 V (vs. Ag/AgCl). The prepared sensor exhibited a high sensitivity of 784.14 µAmM⁻¹ cm⁻², a low detection limit of 2.1×10⁻⁷ M and a wide linear range from 2.5 µM to 4 mM (R=0.9997). More importantly, the LTA modified electrode was also relatively insensitive to commonly interfering species such as ascorbic acid (AA), uric acid (UA), dopamine (DA) in high potential. Moreover, the nonenzymatic sensor was applied to the determination of glucose in human serum samples and the results were in good agreement with clinical data. Electrodes modified with perovskite nanomaterials are highly promising for nonenzymatic electrochemical detection of glucose because of their high sensitivity, fast response, excellent stability and good reproducibility.
authors: Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, School of Chemistry & Chemical Engineering, Huaiyin Normal University, Huaian 223300, PR China.
authors: Yin-zhu
authors: YZ
authors: Wang
authors: Hui
authors: H
authors: Zhong
authors: Xiao-mo
authors: XM
authors: Li
authors: Fei-fei
authors: FF
authors: Jia
authors: Yi-xiang
authors: YX
authors: Shi
authors: Wei-guang
authors: WG
authors: Zhang
authors: Zhi-peng
authors: ZP
authors: Cheng
authors: Li-li
authors: LL
authors: Zhang
authors: Ji-kui
authors: JK
authors: Wang
mesh_terms: D015374:Biosensing Techniques / Q000379:methods*; D001786:Blood Glucose / Q000032:analysis*; D017610:Calcium Compounds / Q000737:chemistry*; D002384:Catalysis; D004566:Electrodes; D006801:Humans; D007811:Lanthanum / Q000737:chemistry*; D057230:Limit of Detection; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D001786:Blood Glucose; D017610:Calcium Compounds; D010087:Oxides; C059910:perovskite; D012834:Silver; D007811:Lanthanum; D014025:Titanium