Solvent Vapor Annealing for Controlled Pore Expansion of Block Copolymer-Assembled Inorganic Mesoporous Films.
Solvent Vapor Annealing for Controlled Pore Expansion of Block Copolymer-Assembled Inorganic Mesoporous Films.
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溶剂蒸气退火，用于控制块共聚物组合的无机介孔膜的孔扩展。
DOI：
10.1021/acs.langmuir.2c00074
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发表时间：
2022-03-15
期刊：
影响因子：
3.9
通讯作者：
Guldin, Stefan
中科院分区：
文献类型：
--
作者：
Alvarez-Fernandez, Alberto;Fornerod, Maximiliano Jara;Reid, Barry;Guldin, Stefan
介孔无机薄膜是一种有前途的材料结构，可用于各种高价值的应用，从光学涂层和纯化膜到传感和储能器件。精确控制多孔网络的结构参数对于扩大其适用性至关重要。为此，使用嵌段共聚物（BCP）作为牺牲结构导向剂通过胶束共组装是一个特别有吸引力的路线，因为所得的孔径直接相关的成孔大分子的回转半径的缩放定律。然而，通过定制合成来定制BCP的分子量是一个复杂的过程，需要精确控制高度敏感的反应条件。已经出现了基于超分子组装或添加不同溶胀剂的替代方法。然而，迄今为止，这些对最终无机介孔膜的结构有序性和孔径分散性存在负面影响。在这项工作中，我们提出了一种新的和有效的方法，用于控制孔径，孔隙率和结构的顺序，这依赖于通过溶剂蒸气退火（SVA）和锁定的结构通过缩合的无机溶胶-凝胶前体的BCP选择性溶胀的协同组合。在这项工作中获得的结果为二氧化钛建立SVA作为一种新的，直接的，简单的，和强大的路线，用于制造具有可控结构特性的介孔薄膜材料。
Mesoporous inorganic thin films are promising materials architectures for a variety of high-value applications, ranging from optical coatings and purification membranes to sensing and energy storage devices. Having precise control over the structural parameters of the porous network is crucial for broadening their applicability. To this end, the use of block copolymers (BCP) as sacrificial structure-directing agents via micelle coassembly is a particularly attractive route, since the resultant pore size is directly related to scaling laws for the radius of gyration of the pore-forming macromolecule. However, tailoring the molecular weight of the BCP via bespoke synthesis is an elaborate process that requires precise control over highly sensitive reactions conditions. Alternative methods have emerged, based on supramolecular assembly or the addition of different swelling agents. Nevertheleses, to date, these present a negative impact on the structural order and pore size dispersity of the final inorganic mesoporous films. In this work, we propose a novel and effective method for control over pore size, porosity, and structural order, which relies on a synergistic combination of BCP selective swelling via solvent vapor annealing (SVA) and locking of the structure by condensation of the inorganic sol–gel precursors. The results obtained in this work for TiO2 establish SVA as a new, straightforward, simple, and powerful route for the fabrication of mesoporous thin-film materials with controllable structural characteristics.
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