Application Of Doped Semiconductor Nanomatcrials In The Chemiluminescence System

Flow injection analysis which can realize on-line automatic inspectionand in the analysis of the whole process, the equipment structure issimple, operation convenient, easy to automatic continuous analysis, fastanalysis speed, high precision, less dosage of reagent and sample, has gota wide applicability. Generally speaking, in order to gain a higherefficiency analysis, FIA must combined with other detection technologies,we mainly use optical detector of chemiluminescence. Because of CLanalysis method without additional light source and monochromator, so itavoid Rayleigh scattering and Raman scattering caused by backgroundinterference, so FIA–CL analysis received rapid progress in recent years.The preparation of II–VI semiconductor method is simple, and thenanomaterials is a wide bandgap direct material, due to their uniquespectrum and band, makes it be a very versatile material and used inelectronics, paint, catalytic and other important industrial technologyabundantly. Doped ions as the combination center of the excited electron–hole to form strong luminescence properties, compared with othermaterials, the illuminated nanocrystalline has narrower emission band,wider excitation band, better optical stability. Therefore, our work ismainly about the doped II–VI semiconductor quantum dots ornanomaterials catalyzed chemiluminescence system.1. We prepared transition metal (Mn、Co、Cu、Ni) doped ZnS quantumdots by Sol-Gel process, and make a series of characterization of thesequantum dots and applied to the chemiluminescence system, the result isZnS:Co quantum dots catalyzed the Luminol–H2O2system obviously, soWe chose ZnS:Co quantum dots as the catalyzer of the system. In order toget possible mechanism, We explored the UV spectrum and fluorescencespectrum of the system. The following work is to study the influence ofbroad spectrum antibiotics on Luminol–H2O2–ZnS:Co system, under theoptimized experimental conditions, amoxicillin can significantly inhibit the chemiluminescence intensity of this system and the detection range is1×10–9g mL–1–8.0×10–6g mL–1. So we set up a new method for detectionof amoxicillin, the result is satisfactory.2. We prepared transition metal(Mn、Co、Cu、Ni) doped ZnOnanomaterials by calcination method, after SEM and EDScharacterization, the results show that these metal ions has doped into theZnO lattice. After application of these nanoparticles intochemiluminescence system, only ZnO:Co nanoparticles can stronglyenhanced the chemiluminescence intensity. We explored the possiblemechanism of the chemiluminescence and the influence of12kinds ofdrugs on Luminol–K2S2O8–ZnS:Co system, only isoniazide can furtherenhanced the chemiluminescence intensity. So we established a newmethod to detection of isoniazid and the detection range is1×1010gmL–1–8.0×107g mL–1.3.Applied the ZnS:Mn quantum dots to Luminol–N2H4.H2O system，then we applied this system to detection some phenols in organic matterand the gallic acidstrengthen the Luminol–N2H4.H2O–ZnS:Mn systemobviously, the detection range is1.0×1011g mL1–6.0×107g mL1,the results is excellent.