title: Highly ordered Ni-Ti-O nanotubes for non-enzymatic glucose detection.
abstract: Anodization is used to fabricate Ni-Ti-O nanotube (NT) electrodes for non-enzymatic glucose detection. The morphology, microstructure and composition of the materials are characterized by field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS). Our results show amorphous and highly ordered NTs with diameter of 50nm, length of 800nm, and Ni/Ti ratio (at %) of 0.35 can be fabricated in ethylene glycol electrolyte supplemented with 0.2 wt.% NH4F and 0.5 vol.% H2O at 30°C and 25V for 1h. Electrochemical experiments indicate that at an applied potential of 0.60V vs. Ag/AgCl, the electrode exhibits a linear response window for glucose concentrations from 0.002mM to 0.2mM with a response time of 10s, detection limit of 0.13μM (S/N=3), and sensitivity of 83μAmM(-1)cm(-2). The excellent performance of the electrode is attributed to its large specific area and fast electron transfer between the NT walls. The good electrochemical performance of the Ni-Ti-O NTs as well as their simple and low-cost preparation method make the strategy promising in non-enzymatic glucose detection.
authors.affiliation: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China. Electronic address: hangruiqiang@tyut.edu.cn.
authors.forename: Ruiqiang
authors.initials: R
authors.lastname: Hang
authors.affiliation: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
authors.forename: Yanlian
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
authors.forename: Ang
authors.initials: A
authors.lastname: Gao
authors.affiliation: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
authors.forename: Long
authors.initials: L
authors.lastname: Bai
authors.affiliation: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Huang
authors.affiliation: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
authors.forename: Xiangyu
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
authors.forename: Naiming
authors.initials: N
authors.lastname: Lin
authors.affiliation: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China. Electronic address: tangbin@tyut.edu.cn.
authors.forename: Bin
authors.initials: B
authors.lastname: Tang
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
authors.forename: Paul K
authors.initials: PK
authors.lastname: Chu
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation; D003217:Conductometry / Q000295:instrumentation*; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005947:Glucose / Q000032:analysis* / Q000737:chemistry; D005949:Glucose Oxidase / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry / Q000648:ultrastructure; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D009532:Nickel / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014025:Titanium / Q000737:chemistry*
chemical_list: C040654:titanium nickelide; C009495:titanium dioxide; D009532:Nickel; D014025:Titanium; D005949:Glucose Oxidase; D005947:Glucose
keywords: Anodization; Glucose sensor; Ni–Ti–O nanotubes; Non-enzyme