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Zhang J.,Huazhong University of Science and Technology | Zhang J.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | Qin Z.,Huazhong University of Science and Technology | Zeng D.,Huazhong University of Science and Technology | And 2 more authors.
Physical Chemistry Chemical Physics | Year: 2017

Metal-oxide-semiconductor (MOS) based gas sensors have been considered a promising candidate for gas detection over the past few years. However, the sensing properties of MOS-based gas sensors also need to be further enhanced to satisfy the higher requirements for specific applications, such as medical diagnosis based on human breath, gas detection in harsh environments, etc. In these fields, excellent selectivity, low power consumption, a fast response/recovery rate, low humidity dependence and a low limit of detection concentration should be fulfilled simultaneously, which pose great challenges to the MOS-based gas sensors. Recently, in order to improve the sensing performances of MOS-based gas sensors, more and more researchers have carried out extensive research from theory to practice. For a similar purpose, on the basis of the whole fabrication process of gas sensors, this review gives a presentation of the important role of screening and the recent developments in high throughput screening. Subsequently, together with the sensing mechanism, the factors influencing the sensing properties of MOSs involved in material preparation processes were also discussed in detail. It was concluded that the sensing properties of MOSs not only depend on the morphological structure (particle size, morphology, pore size, etc.), but also rely on the defect structure and heterointerface structure (grain boundaries, heterointerfaces, defect concentrations, etc.). Therefore, the material-sensor integration was also introduced to maintain the structural stability in the sensor fabrication process, ensuring the sensing stability of MOS-based gas sensors. Finally, the perspectives of the MOS-based gas sensors in the aspects of fundamental research and the improvements in the sensing properties are pointed out. © the Owner Societies 2017.


Liao G.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | Gong Y.,Fuzhou University | Yi C.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | Xu Z.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials
Chinese Journal of Chemistry | Year: 2017

In this work, multifunctional sulfonated polystyrene/polyaniline/silver (SPS/PANI/Ag) nanocomposites are prepared through using sulfonated polystyrene (SPS) spheres as templates and utilizing polyvinylpyrrolidone (PVP) as reducing agent and stabilizing agent. Our method is an environmentally friendly method because no toxic reagents are added during the preparation process. Fourier transform infrared spectrum (FTIR), field emission scanning electron microscopy (FESEM), and energy disperse spectroscopy (EDX) results confirmed the formation of PS spheres, SPS spheres, SPS/PANI nanocomposites, and SPS/PANI/Ag nanocomposites. Powder X-ray diffraction (XRD) patterns indicate that the obtained Ag nanoparticles are crystalline. Solubilities measurements show that SPS/PANI/Ag nanocomposites have improved solubilities when compared to pure PANI in common organic solvents and deionized water. Antibacterial studies show that SPS/PANI/Ag nanocomposites can greatly inhibit the growth of Escherichia coli and Staphylococcus aureus. Anticorrosion studies show that the incorporation of SPS/PANI/Ag nanocomposites in waterborne alkyd resin can greatly promote the anticorrosive efficiency of waterborne alkyd resin. © 2017 SIOC, CAS, Shanghai & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Zhu J.,Hubei University | Song X.,Wuhan University of Science and Technology | Gao L.,Hubei University | Li Z.,Hubei University | And 5 more authors.
Biosensors and Bioelectronics | Year: 2014

An effective dual-emission fluorescent Ag nanoclusters (NCs)-based probe have been constructed for rapid and selective detection of cysteine (Cys) with tunable sensitivity. Electrostatically induced reversible phase transfer method is employed to synthesize Ag nanoclusters with tunable emission intensity at 430. nm and 630. nm by controlling molar ratio between Ag and glutathione. The fluorescence of the Ag nanoclusters could be selectively quenched in the presence of Cys with a detection limit as low as 10. nM. Good linear correlations are obtained over the concentration range from 0.5 to 55. μM (quenched emission at 630. nm), 55 to 120. μM and 120 to 220. μM (enhanced emission at 555. nm) and 120 to 200. μM (quenched emission at 430. nm), respectively. The long-wavelength emission of the Ag nanoclusters can avoid the interference of the autofluorescence of the biosystems, which facilitated their applications in monitoring Cys in urine. © 2013.


Zhou D.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | Tang B.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | Lu X.-H.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | Wei X.-L.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | And 2 more authors.
Catalysis Communications | Year: 2014

Selective oxidation of alkenes with air to corresponding epoxides was performed over simple ion-exchanged Co-MOR and Co-5A. Among all transition metal ions-exchanged M-zeolites, both Co-MOR and Co-5A exhibited the highest activity at 363 K. Notably, for the epoxidation of styrene, α-pinene, α-methyl styrene and cyclooctene, Co-MOR obtained higher conversions than Co-5A, in agreement with the difference of pore sizes of both zeolitic materials. Recycling and control tests showed high durability of Co-MOR as a heterogeneous catalyst in our catalytic system. © 2013 Elsevier B.V.


Lu X.-H.,Hubei University | Sun Y.-W.,Hubei University | Wei X.-L.,Hubei University | Peng C.,Hubei University | And 2 more authors.
Catalysis Communications | Year: 2014

Different from any other catalytic systems containing transition metals and additives, sodium hydroxide itself was found to be a unique and effective catalyst for the solvent-free synthesis of the secondary amines via the N-alkylation of amines with alcohols. For the reaction of aniline with benzyl alcohol, 99.6 mol% conversion of aniline and 99.5% selectivity of the product were achieved under optimal conditions. Also, high conversion and selectivity could be acquired for the N-alkylations of various amines with alcohols, implying the universality of this methodology. Mechanistic studies revealed that this novel reaction most possibly proceeds with a base-catalyzed mechanism. © 2014 Elsevier B.V.


Sun Y.-W.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | Sun Y.-W.,Hubei University | Lu X.-H.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | Lu X.-H.,Hubei University | And 6 more authors.
Catalysis Communications | Year: 2014

Co2+-exchanged zeolite catalysts were prepared by an ion-exchange route and firstly applied in the N-alkylation of aromatic amines with alcohols to imines. For the N-alkylation of aniline with benzyl alcohol, the aniline conversion of 89.8 mol% with an imine selectivity of 100% was achieved over Co-13X at 433 K under optimal conditions. The results showed that many factors including the Co loading, the support, the temperature, the alkali, could influence the reactions. Investigations carried out by XRD, SEM and recycling studies indicated that the Co-13X catalyst still remained porous structures of 13X zeolite and possessed a stable catalytic activity. © 2013 Elsevier B.V.


Chen X.,Huazhong University of Science and Technology | Chen X.,Hubei University | Xiao J.,Hubei University | Yao J.,Hubei University | And 4 more authors.
Ceramics International | Year: 2014

Single-phase Bi4NdTi3Fe0.7Ni 0.3O15 polycrystalline samples were synthesized following a multicalcination procedure. The sample exhibited multiferroic property at room temperature, which was demonstrated by the ferroelectric (2Pr=8.52 μC/cm2, 2Ec=89 kV/cm at applied electric field 110 kV/cm) and magnetic (2Mr=388 m emu/g, 2Hc=689 Oe at applied magnetic field 1.04 T) hysteresis loops. More importantly, magnetoelectric coupling effect is observed from measurements of electrical properties not only under small but also under large electric signal when an external magnetic field is applied. The present results suggest a new candidate for a room temperature multiferroic material with magnetoelectric coupling effect. © 2013 Elsevier Ltd and Techna Group S.r.l.All rights reserved.


PubMed | Hubei University and Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials
Type: | Journal: Luminescence : the journal of biological and chemical luminescence | Year: 2016

This paper proposed a simple and sensitive approach for detecting graphene oxide (GO) in a wide pH range in environmental water samples using fluorescent -CD protected Cu NCs based on the hydrogen-bond interactions between GO and 6-SH--CD. The influences of dilution ratio and pH were investigated. We found that the fluorescence quenching efficiency of Cu NCs by GO remained almost the same under pH from 4 to 10, which benefitted the monitoring of GO under different pH conditions in real samples. The fluorescence quenching mechanism was also discussed. The fluorescence of -CD protected Cu NCs could be quenched in the presence of GO with a lowest detection concentration of 0.1mgL


Zhang T.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | Wu B.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | Sun N.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | Ye Y.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | Chen H.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials
Water Science and Technology | Year: 2013

Pharmaceuticals and personal care products (PPCPs) have drawn popular concerns recently as an emerging class of aquatic contaminants. In this study, adsorption and degradation of four selected PPCPs, metronidazole, tinidazole, caffeine and chloramphenicol, have been investigated in the laboratory using two agricultural soils in China and sediment from Changjiang River. Adsorption tests using a batch equilibrium method demonstrated that adsorption of all tested chemicals in soils could be well described with Freundlich equation, and their adsorption affinity on soil followed the order of chloramphenicol >caffeine> tinidazole> metronidazole. Generally, higher Kf value was associated with soils which had higher organic matter contents (except for caffeine acid in this study). Degradation of selected PPCPs in soils generally followed first-order exponential decay kinetics, and half-lives ranging from 0.97 to 10.21 d. Sterilization generally decreased the degradation rates, indicating that microbial activity played a significant role in the degradation in soils. The degradation rate constant decreased with increasing initial chemical concentrations in soil, implying that the microbial activity was inhibited with high chemical loading levels. © 2013 IWA Publishing.


Liu X.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | Sun N.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | Zhu Q.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | Wu M.,Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials | And 2 more authors.
Journal of Chromatography A | Year: 2013

The present work aims to synthesize an organic-inorganic hybrid caffeine imprinted monolith using one-step method. The synthesis conditions such as the type of inorganic precursor and porogenic solvent, the molar ratios of the monomer and cross-linker, the volume ratio of the inorganic alcoholysate and organic part were optimized. The morphology of the monolith was studied by scanning electron microscopy and Fourier transform infrared spectra. The imprinted factor of the monolith for caffeine reached 3.02. A simple, rapid and sensitive method for the determination of caffeine in children's milk using the organic-inorganic hybrid caffeine imprinted polymer monolith microextraction combined with high-performance liquid chromatography-photodiodes array detector was developed. Several parameters affecting the sample pretreatment were investigated, including the type, flow rate and volume of eluent, the flow rate and volume of sample solution. The assay exhibited a linear dynamic range of 8-500μgL-1 with the correlation coefficient above 0.9987. Lower limits of detection (LOD, at S/N=3) and quantification (LOQ, at S/N=10) in children's milk samples were 2.7 and 8μgL-1. Recoveries of caffeine from spiked children's milk ranged from 85 to 104% with relative standard deviations of less than 8.9%. © 2013 Elsevier B.V.

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