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Zhang R.,Center for Analysis and Measurement | Lu S.,Center for Analysis and Measurement | Zhang L.,Center for Analysis and Measurement | Chen G.,Center for Analysis and Measurement
Journal of Chromatography A | Year: 2014

Graphene and nickel nanoparticles (NiNPs) were assembled on anion exchange resin (AER) microspheres based on the electrostatic interaction between graphene oxide sheets and AER and the subsequent chemical reduction. The prepared AER@graphene-NiNP composite core-shell microspheres were characterized by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. Moreover, they were embedded in the bores of pipette tips to fabricate electrodes. The performance of the novel electrodes was demonstrated by measuring sucrose, glucose and fructose in combination with capillary electrophoresis. The three analytes were well separated within 8min in a 40cm long capillary at a separation voltage of 12kV. The graphene-NiNP composite microsphere electrodes exhibited higher sensitivity (213.578-317.064nAmM-1), lower detection limits (0.75-1.05μM) and enhanced separation efficiency in the detection of these carbohydrates. The advantages of the electrodes include ease of fabrication, low cost and pronounced electrocatalytic activity toward carbohydrates, indicating great promise for a wide range of applications. © 2014 Elsevier B.V.All rights reserved.

Lu X.-C.,Center for Analysis and Measurement | Lu X.-C.,Fudan University | Zhao R.,Center for Analysis and Measurement | Wu T.-L.,Center for Analysis and Measurement | And 2 more authors.
Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities | Year: 2011

A suitable synthesis condition of framework zinc-substituted MFI zeolite was obtained and first reported in this paper. The molar ratios was as follows: 0.3Na2O/0.08Zn (Ac)2/SiO2/0.15TPAOH/0.12 citric acid/100H2O, the reaction was carried out at 200°C for 7-10 d. The synthesized sample was characterized with XRD, 29Si MAS NMR and EXAFS. The results show that the synthesized sample is MFI zeolite. 29Si MAS NMR and EXAFS indicate that Zn atoms have been incorporated into the framework.

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