title: Preparation of ZnS:Ni/ZnS quantum dots with core/shell structure and application for detecting cefoperazone-sulbactam.
abstract: ZnS:Ni quantum dots (QDs) have been synthesized via a water-soluble route, which were coated by ZnS shell through surface modification to give ZnS:Ni/ZnS QDs. The QDs were characterized by atomic force microscope, X-ray diffraction, infrared spectrometry and fluorescent spectrometry. Then, a novel method for the determination of cefoperazone-sulbactam (CPZ-SBT) in aqueous solutions has been developed based on the enhancement of fluorescence of ZnS:Ni/ZnS QDs in the presence of CPZ-SBT. Under the optimal conditions, the enhanced fluorescence intensity (ΔF) was proportional to CPZ-SBT concentration in the range of 8.0×10(-6)-1.0×10(-4) g/L with a detection limit of 1.0×10(-7) g/L. The method was employed for the determination of CPZ-SBT in sample to give satisfactory result. Compared with others, this method was more sensitive, fast and simple with low limit detection.
authors.affiliation: Institute of Environmental and Analytical Sciences, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, PR China. Electronic address: qujy@henu.edu.cn.
authors.forename: Jianying
authors.initials: J
authors.lastname: Qu
authors.affiliation: Institute of Environmental and Analytical Sciences, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, PR China.
authors.forename: Zhuanying
authors.initials: Z
authors.lastname: Zhu
authors.affiliation: Institute of Environmental and Analytical Sciences, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, PR China.
authors.forename: Changda
authors.initials: C
authors.lastname: Wu
authors.affiliation: Institute of Environmental and Analytical Sciences, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, PR China.
authors.forename: Lianjie
authors.initials: L
authors.lastname: Zhang
authors.affiliation: College of Bioengineering, Henan University of Technology, Zhengzhou, Henan 450000, PR China.
authors.forename: Jianhang
authors.initials: J
authors.lastname: Qu
mesh_terms: D002021:Buffers; D002138:Calibration; D002438:Cefoperazone / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D009532:Nickel / Q000737:chemistry*; D045663:Quantum Dots; D013050:Spectrometry, Fluorescence; D013054:Spectrophotometry, Atomic; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013407:Sulbactam / Q000032:analysis*; D013440:Sulfides / Q000737:chemistry*; D013818:Thermogravimetry; D014961:X-Ray Diffraction; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D002021:Buffers; D013440:Sulfides; D017967:Zinc Compounds; D009532:Nickel; D002438:Cefoperazone; C031238:zinc sulfide; D013407:Sulbactam
keywords: Cefoperazone; Quantum dots; Sulbactam