The effects of drying time and relative humidity on the stability of sol-gel derived silicate films in solution
The effects of drying time and relative humidity on the stability of sol-gel derived silicate films in solution
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DOI：
10.1016/s0022-0728(01)00723-9
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发表时间：
2002-02-08
影响因子：
4.5
通讯作者：
Khramov, A
中科院分区：
文献类型：
--
作者：
Collinson, MM;Wang, HM;Khramov, A
硅酸盐薄膜在溶液中的稳定性进行了评估，作为干燥时间和干燥条件的函数，使用扫描探针显微镜和电化学探针技术。在这些实验中，使用通过四甲氧基硅烷的酸催化水解和缩合形成的溶胶将硅酸盐膜旋涂在各种基底上。然后将硅酸盐膜在25、50或75%的相对湿度下干燥3、12、24或48小时。干燥后，将膜立即置于硝酸钾溶液或氧化还原探针溶液中，特别是二茂铁甲醇、钌六氨合物或钴菲咯啉。循环伏安法结合原子力显微镜被用来监测破坏凝胶结构的膜坐在水溶液中。发现每种膜的稳定性基本上与其涂覆的基材无关，但与干燥时间的长度和干燥时的相对湿度密切相关。在25%湿度下干燥48小时的膜在电极上停留数天。相反，在75%湿度下干燥3小时的膜在24小时内从电极上脱落。(C)2002 Elsevier Science B.V.保留所有权利。
The stability of thin silicate films in solution has been evaluated as a function of drying time and drying conditions using scanning probe microscopy and an electrochemical probe technique. In these experiments, the silicate films were spin coated on various substrates using a sol formed by the acid catalyzed hydrolysis and condensation of tetramethoxysilane. The silicate films were then dried under a relative humidity of 25, 50, or 75% for 3, 12, 24, or 48 h. After drying, the films were immediately placed in a solution of potassium nitrate or a solution of a redox probe, specifically ferrocene methanol, ruthenium hexaammine, or cobalt phenanthroline. Cyclic voltammetry in conjunction with atomic force microscopy was used to monitor the disruption in gel structure as the films sat in aqueous solution. The stability of each film was found to be essentially independent of the substrate it was coated on but a strong function of the length of the drying time and the relative humidity under which it was dried. Films that were dried at 25% humidity for 48 h stayed on the electrode for several days. In contrast, films that were dried at 75% humidity for 3 h fell off the electrode within 24 h. (C) 2002 Elsevier Science B.V. All rights reserved.