層狀鈣鈦礦混成材奈米複合材料之製備與鑑定

Studies on the synthesis and physical properties of nanocomposites of layered perovskite hybrides

黃郁翔

指導教授 ： 廖建勛

元智大學/工程學院/化學工程與材料科學學系/碩士(2004年)

摘要

本研究製備兩種Dion-Jacobson型層狀鈣鈦礦結構金屬氧化物CsPb2Nb3O10及KCa2Nb3O10，分別選用H+、HOOC(CH2)10NH3+及tetrabutylammonium ions(TBA+)之插層劑進行離子交換反應進行其表面改質。以X-ray繞射儀(XRD)、掃瞄式電子顯微鏡(SEM)、拉曼光譜(Raman Spectrum)、霍式轉換紅外光吸收光譜(IR Spectrum)、熱重分析儀(TGA)…等儀器探討其物理性質；並於溶液中製備有機/無機混成物HOOC(CH2)10NH3Ca2Nb3O10之高分子奈米複合材料，再以介電分析儀(DEA)分析其介電性質。由XRD及SEM實驗結果顯示Layered HCa2Nb3O10經HOOC(CH2)10NH3+及TBA+離子交換反應後，已能有效的增加其層間距達31.08Ǻ以上並改善其表面型態。由拉曼散射光譜及紅外光譜證實離子交換造成晶格扭曲的現象。TGA及DSC的熱分析結果顯示兩種質子化衍生物在高溫時產生拓樸化學凝聚反應，能脫水生成穩態的三維網狀結構；並計算出HOOC(CH2)10NH3Ca2Nb3O10之氧化裂解所造成重量損失。高分子奈米複合材料以溶液澆鑄法鑄膜，以介電分析儀進行介電性質的量測，分析有機/無機混成物於高分子奈米複合材料中之比例對介電常數的影響；並經由電性模數的轉換探討溫度與導電度特徵鬆弛時間的關係。

關鍵字

層狀鈣鈦礦結構 ； 無機金屬氧化物 ； 高介電常數

並列摘要

In this research, the layered perovskites of CsPb2Nb3O10 and KCa2Nb3O10 metal oxides of Dion-Jacobson phases were modified by ion-exchange of H+、HOOC(CH2)10NH3+ and tetrabutylammonium ions(TBA+). The instruments of X-ray diffraction instrument(XRD)、scanning electron microscope(SEM)、Raman scattering spectrometer、Fourier transform infrared spectrometer(FTIR)、thermogravimetric analysis(TGA) were used to analyze the physical properties. The polymer nanocomposite composed with PMMA and HOOC(CH2)10NH3- Ca2Nb3O10 were prepared in N,N-Dimethyl formamide(DMF). From XRD data and SEM morphology, the d-spacing of layered HCa2Nb3O10 increased effectively by intercalated ions of HOOC(CH2)10NH3+ and TBA+. The Raman and IR spectrum suggested that the lattice distortion of the perovskite layer existed due to the ion-exchanging process. The experimental results of TGA and DSC showed that the dehydration of topochemical condensation reactions proceeded under high temperature. It made the protoned derivatives stable. The weight loss due to the oxidative decomposition of HOOC(CH2)10NH3Ca2Nb3O10 was calculated by TGA analysis. The dielectric properties measured by dielectric analyzer (DEA) was analyzed to elucidate the effect of nanocomposite composition on the temperature dependence of dielectric constant and conductivity relaxation time.

並列關鍵字

HASH(0xc79c93c)

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