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Studies on Electrochemiluminescence of Ammonia Modified CdS Nanomaterials and on Detection of Heavy Metal Ion Based on Gold Nanoparticles

Author: ZhangFuQiang
Tutor: WangHaiYan；WuAiGuo
School: Anhui Normal University
Course: Analytical Chemistry
Keywords: ECL CdS NPs Au NPs Hg2+ Co2+
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 73
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Abstract


Nanomaterials have been widely used in many fields such as light emitting devices, light sensors and photocatalysis because of their special properties in optics, electricity, magnetism and mechanics. As a typical type of II-VI semiconductor nanoparticles, CdS nanoparticles （NPs）, has excellent photo-electric conversion and luminescent properties. One of the most important properties for Au nanoparticles （Au NPs） is their SPR absorption mainly relying on its surroundings, different sizes and shapes.and widely used in biomedicines and analytical sciences and so on. In this thesis, studies on electrochemiluminescence （ECL） of ammonia modified CdS nanomaterials, and functionalized Au nanoparticles for the detection of heavy metal ions which provides a simple、fast and sensitive detection way of metal ion. The details are summarized as follows:（1） CdS nanoparticles usually exhibit very weak ECL. But when CdS nanoparticles were treated by heating in the presence of ammonia, greatly enhanced ECL was observed. The ECL of the treated CdS modified electrode in phosphate buffer solution containing 0.1 M K2S2O8 was 310 times higher than that of CdS. The treatment caused the changes in the morphology and surface electronic structure of CdS nanoparticles, which promoted the reduction process of CdS, consequently improved the quantity of the excited states, led to great enhancement in ECL.（2） Thiacetamide is hydrolyzed to produce H2S under an acidic condition. The Au NPs reacted with H2S on their surfaces, When Hg2+ was added, and HgS was formed on the surface of Au NPs which leads to a change of their SPR absorptions. According to the changes of their SPR absorptions, it could detect Hg2+ qualitatively and quantitatively.（3） Thioglycolic acid （TGA） functionalized of hexadecyl trimethyl ammonium bromide （CTAB） as a stabilizer of Au nanoparicles, TGA and hexadecyl trimethyl ammonium bromide attached on the surface of Au nanoparicles. The functionalized Au nanoparicles were aggregated in the presence of Co2+ due to binding with a chelating ligand, and the CTAB were separated from the surface of Au nanoparicles, because the CTAB and the TGA had a cooperative effect on the recognition of Co2+. It could be explained that coordination compounds were formed by Co2+ with–COOH at the aid of CTAB. Therefore, this approach could assay for Co2+ in aqueous solutions.

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