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Development of a probe based on quantum dots embedded with molecularly imprinted polymers to detect parathion

100%

Tang J. , Xiang L.

nr 2

Surface molecularly imprinted CdTe nanoparticles with molecular recognitive activity were prepared by reverse microemulsion polymerization with parathion as template molecules, 3-aminopropyltriethoxysilane and tetramethoxysilane as the polymerization precursors, and cross-linking. The determination method for parathion was developed on the basis of the fluorescence quenching of quantum dots caused by parathion due to the binding of molecularly imprinted cavities to parathion. The synthesized material had a distinguished selectivity and high binding affinity to parathion compared with chlopyrifos, diazinon, and pyrimithate. Under optimal conditions, the relative fl uorescence intensity of polymers decreased with increases of the concentration of parathion in the range 0.05-1000 μmol/L. The decreasing tendency of fluorescence intensity with increasing parathion concentration abides by the logistical growth curve with a detected limit of 0.218 μmol/L. This method was used to detect for parathion in water samples, for which recoveries ranging from 97.72% to 100.59% were obtained.

Diethylenetriamine-assisted one-step hydrothermal synthesis of cotton-like CoS cluster for high-performance supercapacitor

80%

Zhu J. , Xiang L. , Zhou Y. , Yang J.

tom Vol. 36, No. 2

297--303

Cotton-like CoS cluster has been successfully synthesized via a simple one-step hydrothermal route assisted by diethylenetriamine (DETA) as a ligand and structure-directing agent. The structure and morphology of the product were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM) and N2 adsorption-desorption isotherm. The CoS sample which has a hexagonal phase without any impurities possesses a microscopic morphology made by cotton-like clusters. The as-fabricated CoS as a supercapacitor electrode presents desirable supercapacitive performance with a high specific capacitance (664 F·g-1 at 0.5 A·g-1), remarkable rate capability and excellent cycling stability (85.7 % specific capacitance retention after 1000 cycles), making it applicable as an electrode for high-performance supercapacitors.