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Simultaneous deposition of Au nanoparticles during flame synthesis of TiO2 and SiO2

机译:在TiO2和SiO2的火焰合成过程中同时沉积Au纳米颗粒

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Nanostructured gold/titania and gold/silica particles with up to 4 wt% Au were made by a single step process in a spray flame reactor (M?dler et al., 2003). Gold(III)-chloride hydrate and titania or silica based metalorganic precursors were mixed in a liquid fuel solution keeping concentrations in the flame and overall combustion enthalpy constant. The powders were characterized by XRD, TEM and BET analysis. The titania or silica specific surface area and the crystalline structure of titania were not affected by the presence of gold in the flame. Furthermore, the size of the gold deposits was independent of the metal oxide support (TiO2 or SiO2) and its specific surface area 100 m2/g and (320 m2/g, respectively). The gold nanoparticles were non-agglomerated, spherical and mostly single crystalline and well dispersed on the metal oxide support. Depending on the Au weight fraction (1, 2 and 4 wt%) the Au nanoparticles mass mean diameter was 3, 7 and 15 nm, respectively on both titania and silica.
机译:纳米结构的金/二氧化钛和金/二氧化硅颗粒具有高达4wt%au的通过在喷雾火焰反应器中的单步工艺进行(M?Dler等,2003)。在液体燃料溶液中混合金(III)金(III) - 氯化物水合物和二氧化钛或二氧化硅的金属有机原体在液体燃料溶液中保持浓度和​​总燃烧焓恒定。粉末以XRD,TEM和BET分析为特征。二氧化钛或二氧化硅特异性表面积和二氧化钛的结晶结构不受火焰中金的存在的影响。此外,金沉积物的尺寸与金属氧化物载体(TiO 2或SiO 2)及其比表面积100m 2 / g的尺寸无关,以及(分别为320m 2 / g)。金纳米颗粒是非凝聚的,球形的,大多是单晶的,并且很好地分散在金属氧化物载体上。取决于Au重量级分(1,2和4wt%),Au纳米颗粒的质量平均直径分别为二氧化钛和二氧化硅。

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