Darstellung lanthanoidhaltiger Oxid- und Hydroxidphasen : neue Konzepte zur Kontrolle von Morphologie und funktionellen Eigenschaften
Darstellung lanthanoidhaltiger Oxid- und Hydroxidphasen : neue Konzepte zur Kontrolle von Morphologie und funktionellen Eigenschaften
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DOI：
10.22028/d291-23959
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
E. Hemmer
中科院分区：
文献类型：
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作者：
E. Hemmer
鉴于镧系材料在光电器件、生物标志物和造影剂方面的应用潜力，目前人们对纳米晶相的受控合成产生了极大的兴趣。本文合成了具有不同配体和金属组合的镧系烷氧化物，并测定了它们的分子结构。通过溶剂热法、溶胶-凝胶法和气相沉积法研究了前驱体化学对水解和缩合反应的影响。根据前驱体化学性质和工艺参数的不同，溶剂热处理可得到纳米晶Ln(OH)3、LnOOH、LnCl(OH)2和LnOCl。添加剂的变化可以精确控制Ln(OH)3相的形态，范围从纳米棒到纳米颗粒。除了单金属无机相外，还制备了在光沉默基质中含有光学活性tb离子的发光纳米复合材料。为了证明其在纳米医学中的潜在应用，研究了Gd(OH)3结构的细胞毒性，并首次尝试将纳米结构表面功能化以制备核-壳-结构。
Given the application potential of lanthanide-based materials in optoelectronic devices, biomarkers and contrast agents there is currently enormous interest in the controlled synthesis of nanocrystalline phases. In this work, lanthanide alkoxides with different ligands and metal combinations were synthesized and their molecular structures were determined. The suitability of the obtained compounds as precursors for material synthesis by solvothermal, sol-gel and CVD process was investigated to illustrate influence of precursor chemistry on hydrolysis and condensation reactions. Depending on precursor chemistry and process parameters, the solvothermal treatment resulted in nanocrystalline Ln(OH)3, LnOOH, LnCl(OH)2 and LnOCl. Variation of additives allowed a precise control over the morphology of Ln(OH)3 phases ranging from nanorods to nanoparticles. Besides monometallic inorganic phases, luminescent nanocomposites containing optically active Tb-ions in an optically silent matrix were prepared. To demonstrate their potential applications in nanomedicine, cell toxicity of Gd(OH)3 structures was investigated and first effort toward the surface functionalization of nanostructures was undertaken to fabricate core-shell-structures.