摻雜錳、銅之硒化鎘奈米團簇物及其在基板上自組裝形成二維奈米材料之探討
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2019
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本研究第一部分優化先前魔術尺寸硒化鎘奈米團簇化合物[(CdSe)13]2之合成方式，利用摻雜金屬離子作磁光特性之改質，並探討以軟、硬模板來限制其維度生長。經由替換不同前驅物，以元素硒取代昂貴的硒脲作為合成奈米團簇化合物之來源，並藉由錳、銅離子的摻雜，對團簇化合物進行磁光特性的改質。透過元素分析儀、X光粉末繞射儀、紫外光-可見光光譜儀、電子順磁共振光譜儀、X光吸收光譜延伸區精細結構、DFT理論計算及磁圓偏振二色性光譜，以確認元素組成、繞射及電子結構、配位環境、未成對電子的存在及摻雜位置，並推論錳摻雜奈米團簇化合物之發光機制及磁光效應。
本研究第二部分以共聚高分子作為軟模板、中孔洞沸石材料作為硬模板，來限制魔術尺寸硒化鎘奈米團簇化合物[(CdSe)13]2生長，並透過場發射掃描穿透式球差修正電子顯微鏡、X光粉末繞射儀、X光掠角散射的方式，以確認團簇化合物於基材上之排列位向及孔道內之生長，利於實現具有可調控性有序排列量子點超晶格之構想。
The first part of the study is focused on optimization of [(CdSe)13]2 synthesis, metal-ion doping for luminescence, as well as confined growth via soft- and hard-template strategies. Inexpensive elemental selenium is employed to replace selenourea as alternative source for nanocluster synthesis, followed by doping of Mn and Cu for structural and optical modification. Compositions, structural characterizations electronic structures, chemical environment, unpaired electrons and dopant position were conducted via EA, XRD, UV-vis, EPR, EXAFS, DFT calculation and MCD, which confirm proposed mechanism of luminescence and magneto-optic effect. The second part of this study is aimed to self-assembly with conducting polymers as well as spatial confined growth of nanoclusters within nanopores of mesoporous zeolite nanoparticles (MZNs) and graphene-oxide derivatives (MGNs). Oriented and confined growths of nanoclusters, rationally characterized in HRTEM, XRD, GISAXS, are developed onto substrate platform which is in realization of quantum-dot superlattices and their tailored properties.
The first part of the study is focused on optimization of [(CdSe)13]2 synthesis, metal-ion doping for luminescence, as well as confined growth via soft- and hard-template strategies. Inexpensive elemental selenium is employed to replace selenourea as alternative source for nanocluster synthesis, followed by doping of Mn and Cu for structural and optical modification. Compositions, structural characterizations electronic structures, chemical environment, unpaired electrons and dopant position were conducted via EA, XRD, UV-vis, EPR, EXAFS, DFT calculation and MCD, which confirm proposed mechanism of luminescence and magneto-optic effect. The second part of this study is aimed to self-assembly with conducting polymers as well as spatial confined growth of nanoclusters within nanopores of mesoporous zeolite nanoparticles (MZNs) and graphene-oxide derivatives (MGNs). Oriented and confined growths of nanoclusters, rationally characterized in HRTEM, XRD, GISAXS, are developed onto substrate platform which is in realization of quantum-dot superlattices and their tailored properties.
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零維結構, 稀磁性半導體, 硒化鎘, 模板法, 半導體高分子, 中孔洞沸石材料, 0D structure, diluted magnetic semiconductors, (CdSe)13, template, conductive polymer, mesoporous zeolite material