Polymer infiltration synthesis of inorganic nanoporous coatings: Does polymer template affect their properties?
Polymer infiltration synthesis of inorganic nanoporous coatings: Does polymer template affect their properties?
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DOI：
10.1016/j.surfcoat.2022.129107
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发表时间：
2022-12-05
影响因子：
5.4
通讯作者：
Berman, Diana
中科院分区：
文献类型：
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作者：
Omotosho, Khalil;Tran, John;Berman, Diana
使用聚合物模板合成全无机金属氧化物结构可以控制它们的厚度、孔隙度和组成。在这里，我们提供了对纳米多孔氧化锌薄膜作为模型系统的见解，通过渗透聚合物，这些聚合物与金属氧化物前体具有不同的相互作用机制，如固有微孔聚合物（PIM-1）和嵌段共聚物家族的代表（聚苯乙烯-聚乙烯醇吡啶嵌段共聚物）。我们研究了气体（二乙基锌，DEZ和水蒸气）和溶液（乙酰丙酮锌，Zn(acac)2，溶解在乙醇中）相前体的聚合物浸润过程。利用石英晶体微天平（QCM）、x射线衍射（XRD）和x射线光电子能谱-复制（XPS）分析，系统研究了聚合物模板和金属氧化物前驱体形式对合成金属氧化物薄膜性能的影响。我们证明了聚合物模板的渗透可以有效地实现使用气相和溶液相前驱体。研究结果表明，合成的200 nm ZnO薄膜的结晶度主要受前驱体状态（气相或液相）的影响，而与聚合物模板类型无关。反过来，聚合物类型影响ZnO薄膜的表面终止。研究表明，用BCP合成的多孔ZnO涂层（PS-P4VP）表面比用PIM合成的ZnO表面更容易接近；然而，尽管乙醇分子的表面可及性较低，但溶液相前体浸润PIM-1合成的ZnO在室温下暴露于乙醇蒸气时，其电阻率变化最大。
Synthesis of all-inorganic metal oxide architectures using polymer templates offers control over their thickness, porosity, and composition. Here, we provide insights into the synthesis of nanoporous zinc oxide films as a model system via infiltration of polymers that have different mechanisms of interaction with metal oxide precursors such as a polymer of intrinsic microporosity (PIM-1) and representative of the block-copolymers family (poly-styrene-polyvinyl pyridine block copolymer). We investigated polymer infiltration process with both gas (diethyl zinc, DEZ, and water vapors) and solution (zinc acetylacetonate, Zn(acac)2, dissolved in ethanol) phase pre-cursors. Using quartz crystal microbalance (QCM), X-ray diffraction (XRD), and X-ray photoelectron spectros-copy (XPS) analyses, we systematically studied the effect of polymer template and the form of the metal oxide precursors on the properties of synthesized metal oxide thin coatings. We demonstrate that the infiltration of polymer templates can be efficiently achieved using both gas phase and solution phase precursors. We show that the crystallinity of the synthesized 200 nm ZnO films is mainly affected by the state of the precursor (gas or solution phase) and does not depend on the polymer template type. In turn, the polymer type affects the surface termination of ZnO films. We demonstrate that the surface of porous ZnO coatings synthesized with BCP (here PS-P4VP) is more accessible than the surface of ZnO synthesized with PIM; however, despite the lower surface accessibility for ethanol molecules, ZnO synthesized via infiltration of PIM-1 with solution-phase precursors demonstrates the largest change in resistivity upon its exposure to ethanol vapor at room temperature.