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Fluoride additive in epoxide-initiated sol-gel synthesis enables thin-film applications of SnO2 aerogels

机译:环氧化物引发的溶胶 - 凝胶合成中的氟化物添加剂使得SnO2气凝胶的薄膜应用能够

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摘要

Aerogels of SnO2 were synthesized by an epoxide-initiated sol-gel method. Using ammonium fluoride in the precursor solution allowed for tunability of the aerogel morphology while no change in the conductivity was measured. In particular, aerogel shrinkage was decreased dramatically by the addition of the fluoride precursor. Unfluorinated aerogels showed severe shrinkage of 43% volume change upon supercritical drying compared to the original alcogel volume. Fluorinated samples exhibited a much less pronounced shrinkage at 7%. Multiple characterization methods converged to reveal the mechanism by which fluoride enables the morphological tunability. These findings enable the casting of SnO2 aerogels as thin films (which in the absence of fluoride these crack and delaminate due to shrinkage), opening potential uses in many optoelectronic devices including solar cells.
机译:通过环氧化物引发的溶胶 - 凝胶法合成SnO2的气凝胶。 在前体溶液中使用氟化铵,允许气凝胶形态的可调性,同时测量导电性的变化。 特别地,通过加入氟化物前体显着降低气凝胶收缩。 与原始阿耳凝胶体积相比,未灌注的气凝胶显示出超临界干燥时的体积变化的严重收缩。 氟化样品在7%的7%上表现出远不那么明显的收缩。 多种表征方法融合,以揭示氟化物能够实现形态可调性的机制。 这些发现使得SnO2 Aerogels作为薄膜(在没有氟化物的情况下,由于收缩而在没有氟化物和分层),在许多光电器件中使用包括太阳能电池的开口潜力。

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