二維中孔硒化鎘半導體材料合成、結構解析與應用
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2020
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Abstract
本研究成功製備具中孔洞性的有機無機混合材料，用於光催化水分解及染料降解。此材料為二維單層奈米片其組成為CdSe(en)0.5 (en: H2NCH2CH2NH2)，藉由硫化鈉 (0.1M-0.3 M) 在暗處與照光下進行結構中Se, N取代反應，發生科肯德爾效應 (Kirkendall effect) 以達化學修飾法之目的，並產生2-8 nm之中孔洞。此高表面積 (30-60 m2/g) 之中孔洞材料，可有效進行水分解產氫 (HER) 及染料降解等光催化反應，發現硫取代比例影響其催化活性，並以元素分析 (EA, ICP-OES)、電子顯微鏡、X光吸收與繞射技術 (XAS, XRD) 進行奈米材料結構及性質分析，探討其催化活性增強之因素。
另一方面藉由路易斯酸 (氯化鐵、氯化銦) 進行CdSe(en)0.5改質，透過路易斯酸與CdSe(en)0.5中en的胺基配位，使材料結晶結構由Pbca空間群轉變為纖鋅礦結構，形成多層二維無機材料，並透過元素分析、電子顯微鏡、X光吸收與繞射技術 (XAS, XRD) 進行材料結構轉變解析
In this study, a mesoporous organic-inorganic hybrid material was successfully prepared for photocatalytic water splitting and dye degradation. The material is a two-dimensional single-layer nanosheet whose composition is CdSe(en)0.5 (en: H2NCH2CH2NH2). The Se, N substitution reaction in the structure is carried out by sodium sulfide (0.1M-0.3 M) in the dark and under exposure UV. The Kirkendall effect occurs to achieve the purpose of the chemical etching method, and creates a hole in the 2-8 nm. This high surface area (30-60 m2/g) mesoporous material can effectively carry out photocatalytic reactions such as water splitting hydrogen evolution reaction (HER) and dye degradation. It was found that the sulfur substitution ratio affects its catalytic activity, and elemental analysis (EA, ICP-OES), electron microscopy, X-ray absorption and diffraction technology (XAS, XRD) are used to analyze the structure and properties of nanomaterials and explore the factors that enhance their catalytic activity. On the other hand, CdSe(en)0.5 is modified by Lewis acid (ferric chloride, indium chloride), through the coordination of Lewis acid with the amine group of en in CdSe(en)0.5, the crystal structure of the material is changed from the Pbca space group Transform into wurtzite structure to form a multilayer two-dimensional inorganic material, and analyze the material structure transformation through elemental analysis, electron microscopy, X-ray absorption anddiffraction technology (XAS, XRD)
In this study, a mesoporous organic-inorganic hybrid material was successfully prepared for photocatalytic water splitting and dye degradation. The material is a two-dimensional single-layer nanosheet whose composition is CdSe(en)0.5 (en: H2NCH2CH2NH2). The Se, N substitution reaction in the structure is carried out by sodium sulfide (0.1M-0.3 M) in the dark and under exposure UV. The Kirkendall effect occurs to achieve the purpose of the chemical etching method, and creates a hole in the 2-8 nm. This high surface area (30-60 m2/g) mesoporous material can effectively carry out photocatalytic reactions such as water splitting hydrogen evolution reaction (HER) and dye degradation. It was found that the sulfur substitution ratio affects its catalytic activity, and elemental analysis (EA, ICP-OES), electron microscopy, X-ray absorption and diffraction technology (XAS, XRD) are used to analyze the structure and properties of nanomaterials and explore the factors that enhance their catalytic activity. On the other hand, CdSe(en)0.5 is modified by Lewis acid (ferric chloride, indium chloride), through the coordination of Lewis acid with the amine group of en in CdSe(en)0.5, the crystal structure of the material is changed from the Pbca space group Transform into wurtzite structure to form a multilayer two-dimensional inorganic material, and analyze the material structure transformation through elemental analysis, electron microscopy, X-ray absorption anddiffraction technology (XAS, XRD)
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硒化鎘, 二維材料, 有機-無機混合材料, 催化, 半導體, 二維半導體, CdSe, two-dimensional material, Organic-Inorganic Hybrid Materials, space group, catalysis, semiconductor, 2D semiconductor