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876 results on '"Hu, Xiaoya"'

207. Facile Synthesis of Ultrathin Nickel–Cobalt Phosphate 2D Nanosheets with Enhanced Electrocatalytic Activity for Glucose Oxidation

Author

Shu, Yun, Li, Bing, Chen, Jingyuan, Xu, Qin, Pang, Huan, and Hu, Xiaoya

Abstract

Two-dimensional (2D) ultrathin nickel–cobalt phosphate nanosheets were synthesized using a simple one-step hydrothermal method. The morphology and structure of nanomaterials synthesized under different Ni/Co ratios were investigated by transmission electron microscopy, scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Moreover, the influence of nanomaterials’ structure on the electrochemical performance for glucose oxidation was investigated. It is found that the thinnest nickel–cobalt phosphate nanosheets synthesized with a Ni/Co ratio of 2:5 showed the best electrocatalytic activity for glucose oxidation. Also, the ultrathin nickel–cobalt phosphate nanosheet was used as an electrode material to construct a nonenzymatic electrochemical glucose sensor. The sensor showed a wide linear range (2–4470 μM) and a low detection limit (0.4 μM) with a high sensitivity of 302.99 μA·mM–1·cm–2. Furthermore, the application of the as-prepared sensor in detection of glucose in human serum was successfully demonstrated. These superior performances prove that ultrathin 2D nickel–cobalt phosphate nanosheets are promising materials in the field of electrochemical sensing.

Published
2024
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218. Sodium dodecyl sulfate sensitized electrochemical method for sub-picomole level determination of topotecan hydrochloride at a novel disposable electrode

Author

Li Jing, Xu Qin, Yang Zhanjun, Hu Xiaoya, and Li Hongbo

Subjects
Detection limit, Topotecan Hydrochloride, chemistry.chemical_compound, Chromatography, endocrine system diseases, Chemistry, Reagent, Electrode, Peak current, General Chemistry, Sodium dodecyl sulfate, Electrochemistry, Graphite electrode
Abstract

A sub-picomole level topotecan hydrochloride determination method was first proposed using sodium dodecyl sulfate (SDS) as a sensitized reagent at a novel disposable electrode (an improved wax-impregnated graphite electrode). The effects of different kinds of surfactants on the electrochemical response to topotecan hydrochloride were examined. The results indicate the electrochemical signal was apparently improved by SDS. At optimal conditions, the oxidative peak current increased linearly with the logarithm of concentrations for topotecan hydrochloride in the ranges of 2.0 × 10−12 to 1.0 × 10−11 mol/L and 8.0 × 10−11 to 8.0 × 10−10 mol/L with a detection limit of 6.4 × 10−13 mol/L. The proposed method could be applied in determining topotecan hydrochloride in urine.

Published
2010

229. A new method of preparing alkanethiol-protected gold nanoparticals

Author

Hu Xiaoya, Xu Qin, and Guo Rong

Subjects
Sodium borohydride, chemistry.chemical_compound, Aqueous solution, Materials science, chemistry, Inorganic chemistry, Monolayer, General Materials Science, Electrolyte, Fourier transform infrared spectroscopy, Solubility, Electrochemistry, Tetrahydrofuran
Abstract

In a new two-phase system (tetrahydrofuran/saturated NaCl aqueous solution) monolayer protected clusters (MPCs) were prepared. The AuCl4− anion in saturated electrolyte aqueous solution was transferred into the organic phase of tetrahydrofuran by tetra-n-butylammonium bromide ((C4H9)4NBr) and was reduced quickly by sodium borohydride in the presence of alkanethiol. The functionalized MPCs were characterized by solubility, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), energy-dispersive X-ray (EDX) analysis and UV-vis spectroscopy. Electrochemical measurements of MPCs in CH2 Cl2 exhibited 7 pairs of reversible voltammetric waves within the potential range of −1.0 to 1.0V (vs Ag/AgCl), which was ascribed to the quantized capacitance charging of nanoparticle double layers. All the results show that the new preparing method is feasible.

Published
2003

241. Electrochemical determination of purine and pyrimidine DNA bases based on the recognition properties of azocalix[4]arene

Author

Xu Qin, Yin Li-na, Xiaoxian Liu, Hu Xiaoya, and Li Hongbo

Subjects
Purine, Pyrimidine, Chemistry, Guanine, Inorganic chemistry, Biomedical Engineering, Biophysics, General Medicine, Biosensing Techniques, DNA, Electrochemical Techniques, Electrochemistry, Carbon, Nucleobase, Thymine, chemistry.chemical_compound, Pyrimidines, Purines, Microscopy, Electron, Scanning, Organic chemistry, Differential pulse voltammetry, Electrodes, Cytosine, Biotechnology
Abstract

The azocalix[4]arene film modified glassy carbon electrode was established for the convenient and sensitive detection of four DNA bases (guanine, adenine, thymine and cytosine). Field emission scanning electron microscopy, attenuated total reflectance-FTIR and X-ray photoelectron spectroscopy were used to characterize the film. The azocalix[4]arene film exhibited excellent electrocatalytic activity toward the oxidation of all bases. Well-separated voltammetric peaks were obtained among guanine, adenine, thymine and cytosine, which lead to the feasibility for the simultaneous determination of all of them in a mixture without separation or pretreatment. Linear calibration curves were obtained from 0.125 to 200.0 μM for adenine, 0.125 to 175.0 μM for guanine, 2.50 to 650.0 μM for thymine, and 2.50 to 650.0 μM for cytosine. This sensor also exhibits good stability, reproducibility and long lifetime.

Published
2012

243. Channel Modeling for Wireless Underground Sensor Networks

Author

Hu Xiaoya, Gao Chao, Wang Bing-wen, and Xiong Wei

Subjects
Engineering, Wave propagation, business.industry, GeneralLiterature_MISCELLANEOUS, Electronic engineering, Path loss, Wireless, ComputerSystemsOrganization_SPECIAL-PURPOSEANDAPPLICATION-BASEDSYSTEMS, Time domain, Antenna gain, business, Water content, Wireless sensor network, Communication channel
Abstract

Wireless underground sensor networks (WUSNs) consist of wireless devices buried below the ground surface and aboveground sink devices, in which the communication medium is not only air but also soil. In this paper, improved channel models based on time-domain are developed to characterize underground-underground, underground-aboveground and aboveground-underground electromagnetic waves channels, which capture the effects of environment parameters such as soil composition and soil moisture, and system parameters such as the antenna gain, operating frequency, the sensor burial depth. The propagation characteristics are investigated through simulation results of path loss between two nodes. This work will accelerate the design and realization of WUSNs.

Published
2011

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