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研究生： 葉美慧
Ignawati, Sifera
論文名稱： 硫化鎘/硫化鋅及硫化鋅/硫化鎘核殼奈米粒子之製備及其光學與結構之特性探討
Optical and Structure Characterization and Synthesis of CdS/ZnS and ZnS/CdS core shell nanoparticles
指導教授： 陳進成
Chen, Chin-Cheng
學位類別： 碩士
Master
系所名稱： 工學院 - 化學工程學系
Department of Chemical Engineering
論文出版年： 2009
畢業學年度： 97
語文別： 英文
論文頁數： 93
外文關鍵詞： nanoparticle, core-shell, CdS/ZnS, ZnS/CdS
相關次數： 點閱：66  下載：0 
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    • CdS and ZnS core nanoparticles were synthesized by microwave method and then coated with shell material by traditional method, using simple and safe reagents such as cadmium acetate, zinc acetate, and thiourea to synthesis the core shell nanopartices. After coating CdS core by ZnS shell the photoluminescence intensity greatly increase from 18 a.u to a maximum photoluminescence intensity of 225 a.u. For ZnS/CdS core shell nanoparticles, after CdS coated on ZnS core, the photoluminescence intensity increases significantly too, the bare ZnS cores have a photoluminescence intensity of 353 a.u and the ZnS/CdS core shell nanoparticles can reach a maximum photoluminescence intensity of 1460 a.u. Shell formation was confirmed by observation of a red shifting in the photoluminescence spectra. As the precursor feeding rate decreases, it leads the formation of bigger core shell nanoparticles, and so does the increases of precursor concentration. The advantage of the process is that it can be carried out in the open air using simple equipment and is simpler, cheaper, and safer as compared with another method.

    Abstract ………………………………………………………………… I Acknowledgement……………………………………………………… II Contents ………………………………………………………………… IV List of Figures ……………………………………………………….…. VII List of Tables …………………………………………………………… XIV Chapter 1 Introduction …………………………………………………. 1 1.1 Motivation and purpose ……………………………………… 1 1.2 Outline ……………………………………………………….. 4 Chapter 2 Literature Review …………………………………………… 7 2.1 Synthesis Nanoparticles through Homogeneous Nucleation … 8 2.2 Synthesis Nanoparticles through Heterogeneous Nucleation ... 11 2.3 The Photoelectric Effect ……………………………………… 13 2.4 Energy Bands ………………………………………………… 15 2.5 Metals, Semiconductors, and Isolators ………………………. 17 2.6 Electrons and Holes ………………………………………….. 18 2.7 Direct and Indirect Semiconductors ………………………….. 19 2.8 Optical Absorption …………………………………………… 20 2.9 Luminescence ………………………………………………… 21 2.9.1 Phosphorescence and Fluorescence ……………………... 22 2.10 Photoluminescence …………………………………………… 23 2.11 Quantum Dots ………………………………………………... 24 2.12 Quantum Confinement ……………………………………….. 27 2.13 Enhance the Quantum Yield …………………………………. 29 2.13.1 Nanoparticle Optimization ……………………………… 29 2.13.2 Second Component ……………………………………… 30 2.13.3 Photoactivation ………………………………………….. 30 2.13.4 Shell Coating ……………………………………………. 31 2.14 Core shell Nanostructure …………………………………….. 32 2.14.1 Type I Quantum Dots …………………………………… 33 2.14.2 Type II Quantum Dots …………………………………... 33 2.15 Lattice constant calculation …………………………………... 35 Chapter 3 Materials and Methods ………………………………………. 36 3.1. Chemical and Materials ………………………………………. 36 3.2 Equipment ……………………………………………………. 36 3.3 Methods ………………………………………………………. 37 3.3.1 Synthesis CdS core nanoparticles ……………………….. 37 3.3.2 Coating CdS core with ZnS shell ……………………….. 38 3.3.2.1 Using pre heating ZnS precursor …………………….. 38 3.3.2.2 Without pre heating ZnS precursor ………………….. 38 3.3.3 Synthesis ZnS core nanoparticles ……………………….. 40 3.3.4 Coating ZnS core with CdS shell at 180oC and 200 oC reaction temperature using various added precursor rate ……………………………………………. 41 3.4 Analysis Instrument ………………………………………….. 42 3.5 Material Properties …………………………………………… 43 3.5.1 Cadmium acetate ………………………………………... 43 3.5.2 Zinc acetate ……….……………………………………... 43 3.5.3 Thiourea ………..………………………………………...43 3.5.4 TOPO …………………………………..………………... 44 3.5.5 TOP ……………………………….……………………... 44 3.5.6 N, N-Dimethylformamide (DMF) …………………..…... 45 3.5.7 Cadmium Sulfide nanocrystal …....……………………... 45 3.5.8 Zinc Sulfide nanocrystal …………….…………………... 46 Chapter 4 Result and Discussion ……………………………………….. 48 4.1 Synthesis CdS and ZnS nanoparticles ………………………... 48 4.2 Synthesis CdS/ZnS using pre-heating ZnS precursor ………... 49 4.3 Synthesis CdS/ZnS without using pre-heating ZnS precursor... 51 4.3.1 Synthesis CdS/ZnS at 180oC reaction temperature With various ZnS precursor feeding rates ...…………….. 51 4.3.2 Synthesis CdS/ZnS at 180oC reaction temperature With various ZnS concentrations ……...……………….. 57 4.3.3 Synthesis CdS/ZnS at 200oC reaction temperature With various ZnS precursor feeding rates …..………….. 63 4.3.4 Synthesis CdS/ZnS at 200oC reaction temperature With various ZnS concentrations ……………………….. 69 4.4 Synthesis of ZnS/CdS core shell nanoparticles ………………. 75 4.4.1 Synthesis ZnS/CdS at 180oC reaction temperature With various CdS precursor feeding rate ……………….. 75 4.4.1 Synthesis ZnS/CdS at 200oC reaction temperature With various CdS precursor feeding rates……………….. 81 Chapter 5 Conclusion …………………………………………………... 88 References ……………………………………………………………… 90

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