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Rational synthesis of F-doped iron oxides on Al2O3(0001) single crystals

机译:在Al2O3(0001)单晶上合理合成F掺杂的氧化铁

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摘要

A plasma enhanced-chemical vapor deposition (PE-CVD) route to Fe2O3-based materials on Al2O3(0001) single crystals at moderate growth temperatures (200-400 degrees C) is reported. The use of the fluorinated Fe(hfa)(2)TMEDA (hfa = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionate; TMEDA = N,N,N',N'-tetramethylethylenediamine) molecular precursor in Ar/O-2 plasmas enabled an in situ F-doping of iron oxide matrices, with a fluorine content tunable as a function of the adopted preparative conditions. Variations of the thermal energy supply enabled control of the system phase composition, resulting in gamma-Fe2O3 at 200 degrees C and alpha-Fe2O3 nanostructures at higher deposition temperatures. Notably, at 400 degrees C the formation of highly oriented alpha-Fe2O3 nanocolumns characterized by an epitaxial relation with the Al2O3(0001) substrate was observed. Beside fluorine content, phase composition and nano-organization, even the system optical properties and, in particular, energy gap values, could be tailored by proper modifications of processing parameters.
机译:报道了在中等生长温度(200-400摄氏度)下在Al2O3(0001)单晶上通过等离子增强化学气相沉积(PE-CVD)路线生成基于Fe2O3的材料。氟化Fe(hfa)(2)TMEDA的使用(hfa = 1,1,1,1,5,5,5-六氟-2,4-戊二酸酯; TMEDA = N,N,N',N'-四甲基乙二胺) Ar / O-2等离子体中的分子前驱物可原位F掺杂氧化铁基质,其氟含量可根据采用的制备条件进行调节。热能供应的变化实现了系统相组成的控制,从而导致200摄氏度下的γ-Fe2O3和更高沉积温度下的α-Fe2O3纳米结构。值得注意的是,在400摄氏度下,观察到以Al2O3(0001)衬底为外延关系的高取向α-Fe2O3纳米柱的形成。除氟含量,相组成和纳米组织外,甚至可以通过适当修改工艺参数来调整系统的光学性能,尤其是能隙值。

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