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Morphology Of Sol-gel Produced Composite Films For Optical oxygen Sensors

机译:溶胶-凝胶生产的光学氧气传感器复合膜的形貌

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The results reported concern the characterization of thin layer SiO_2-based matrices with an oxygen sensing component Ru(II)-tris(4,7-diphenyl-1,10-phenanthroline) immobilized, when a sol-gel process along with dip- and spin-coating deposition methods are used. SEM, TEM and AFM study, assisted by X-ray energy dispersive microanalysis reveals the influence of the precursors used, sol treatment and the coating conditions on the films morphology and Ru distribution in the matrices. Uniform and smooth surface is produced from tetraethoxysilane (TEOS). The presence of ormosils (methyltriethoxysilane, MtEOS and octyltriethoxysilane, OtEOS) significantly increases the surface roughness exhibited as dots on the SEM image. Their surface concentration and size depend on the number of immersions and withdrawal speed at the dip coating. Spin deposition leads to rather different morphology of the films, based on TEOS/OtEOS. Following commonly used sol preparation procedure (with 1.25-2.5 g Ru-complex/dm~3 sol) microcrystallization of the complex occurs with formation of randomly distributed crystals 100-400 nm in size. The ultrasound treatment of the sol by means of ultrasound disintegrator leads to homogeneous distribution of the complex without observable crystallization and significant improvement of the film sensing properties (increase of Stern-Volmer constant and better linearity of the Stern-Volmer plots both in gaseous and aqueous media).
机译:结果报道了当溶胶-凝胶法与浸涂和浸涂一起使用时,固定有氧传感组分Ru(II)-tris(4,7-diphenyl-1,10-phenothroline)的薄SiO_2基基质的表征。使用旋涂沉积方法。借助SEM,TEM和AFM研究,借助X射线能量色散微分析,揭示了所用前体,溶胶处理和涂覆条件对基质中薄膜形态和Ru分布的影响。由四乙氧基硅烷(TEOS)产生均匀,光滑的表面。甲醛(甲基三乙氧基硅烷,MtEOS和辛基三乙氧基硅烷,OtEOS)的存在显着增加了SEM图像上显示为点的表面粗糙度。它们的表面浓度和大小取决于浸涂次数和浸涂时的抽出速度。基于TEOS / OtEOS,自旋沉积导致膜的形态有很大不同。按照常用的溶胶制备程序(使用1.25-2.5 g Ru-络合物/ dm〜3溶胶),络合物的微晶发生,形成大小为100-400 nm的随机分布的晶体。借助超声崩解剂对溶胶进行超声处理可导致复合物均匀分布,而没有可观察到的结晶,并且显着改善了薄膜感测特性(增加了Stern-Volmer常数,并改善了Stern-Volmer图在气体和水溶液中的线性)媒体)。

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